Parameters and Values
3
GOBJECT Library

# Parameters and Values

Standard Parameter and Value Types

## Synopsis

    #include <glib-object.h>

    #define             G_IS_PARAM_SPEC_BOOLEAN             (pspec)
    #define             G_PARAM_SPEC_BOOLEAN                (pspec)
    #define             G_VALUE_HOLDS_BOOLEAN               (value)
    #define             G_TYPE_PARAM_BOOLEAN
                        GParamSpecBoolean;
    GParamSpec*         g_param_spec_boolean                (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             gboolean default_value,
                                                             GParamFlags flags);
    void                g_value_set_boolean                 (GValue *value,
                                                             gboolean v_boolean);
    gboolean            g_value_get_boolean                 (const GValue *value);

    #define             G_IS_PARAM_SPEC_CHAR                (pspec)
    #define             G_PARAM_SPEC_CHAR                   (pspec)
    #define             G_VALUE_HOLDS_CHAR                  (value)
    #define             G_TYPE_PARAM_CHAR
                        GParamSpecChar;
    GParamSpec*         g_param_spec_char                   (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             gint8 minimum,
                                                             gint8 maximum,
                                                             gint8 default_value,
                                                             GParamFlags flags);
    void                g_value_set_char                    (GValue *value,
                                                             gchar v_char);
    gchar               g_value_get_char                    (const GValue *value);

    #define             G_IS_PARAM_SPEC_UCHAR               (pspec)
    #define             G_PARAM_SPEC_UCHAR                  (pspec)
    #define             G_VALUE_HOLDS_UCHAR                 (value)
    #define             G_TYPE_PARAM_UCHAR
                        GParamSpecUChar;
    GParamSpec*         g_param_spec_uchar                  (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             guint8 minimum,
                                                             guint8 maximum,
                                                             guint8 default_value,
                                                             GParamFlags flags);
    void                g_value_set_uchar                   (GValue *value,
                                                             guchar v_uchar);
    guchar              g_value_get_uchar                   (const GValue *value);

    #define             G_IS_PARAM_SPEC_INT                 (pspec)
    #define             G_PARAM_SPEC_INT                    (pspec)
    #define             G_VALUE_HOLDS_INT                   (value)
    #define             G_TYPE_PARAM_INT
                        GParamSpecInt;
    GParamSpec*         g_param_spec_int                    (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             gint minimum,
                                                             gint maximum,
                                                             gint default_value,
                                                             GParamFlags flags);
    void                g_value_set_int                     (GValue *value,
                                                             gint v_int);
    gint                g_value_get_int                     (const GValue *value);

    #define             G_IS_PARAM_SPEC_UINT                (pspec)
    #define             G_PARAM_SPEC_UINT                   (pspec)
    #define             G_VALUE_HOLDS_UINT                  (value)
    #define             G_TYPE_PARAM_UINT
                        GParamSpecUInt;
    GParamSpec*         g_param_spec_uint                   (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             guint minimum,
                                                             guint maximum,
                                                             guint default_value,
                                                             GParamFlags flags);
    void                g_value_set_uint                    (GValue *value,
                                                             guint v_uint);
    guint               g_value_get_uint                    (const GValue *value);

    #define             G_IS_PARAM_SPEC_LONG                (pspec)
    #define             G_PARAM_SPEC_LONG                   (pspec)
    #define             G_VALUE_HOLDS_LONG                  (value)
    #define             G_TYPE_PARAM_LONG
                        GParamSpecLong;
    GParamSpec*         g_param_spec_long                   (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             glong minimum,
                                                             glong maximum,
                                                             glong default_value,
                                                             GParamFlags flags);
    void                g_value_set_long                    (GValue *value,
                                                             glong v_long);
    glong               g_value_get_long                    (const GValue *value);

    #define             G_IS_PARAM_SPEC_ULONG               (pspec)
    #define             G_PARAM_SPEC_ULONG                  (pspec)
    #define             G_VALUE_HOLDS_ULONG                 (value)
    #define             G_TYPE_PARAM_ULONG
                        GParamSpecULong;
    GParamSpec*         g_param_spec_ulong                  (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             gulong minimum,
                                                             gulong maximum,
                                                             gulong default_value,
                                                             GParamFlags flags);
    void                g_value_set_ulong                   (GValue *value,
                                                             gulong v_ulong);
    gulong              g_value_get_ulong                   (const GValue *value);

    #define             G_IS_PARAM_SPEC_INT64               (pspec)
    #define             G_PARAM_SPEC_INT64                  (pspec)
    #define             G_VALUE_HOLDS_INT64                 (value)
    #define             G_TYPE_PARAM_INT64
                        GParamSpecInt64;
    GParamSpec*         g_param_spec_int64                  (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             gint64 minimum,
                                                             gint64 maximum,
                                                             gint64 default_value,
                                                             GParamFlags flags);
    void                g_value_set_int64                   (GValue *value,
                                                             gint64 v_int64);
    gint64              g_value_get_int64                   (const GValue *value);

    #define             G_IS_PARAM_SPEC_UINT64              (pspec)
    #define             G_PARAM_SPEC_UINT64                 (pspec)
    #define             G_VALUE_HOLDS_UINT64                (value)
    #define             G_TYPE_PARAM_UINT64
                        GParamSpecUInt64;
    GParamSpec*         g_param_spec_uint64                 (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             guint64 minimum,
                                                             guint64 maximum,
                                                             guint64 default_value,
                                                             GParamFlags flags);
    void                g_value_set_uint64                  (GValue *value,
                                                             guint64 v_uint64);
    guint64             g_value_get_uint64                  (const GValue *value);

    #define             G_IS_PARAM_SPEC_FLOAT               (pspec)
    #define             G_PARAM_SPEC_FLOAT                  (pspec)
    #define             G_VALUE_HOLDS_FLOAT                 (value)
    #define             G_TYPE_PARAM_FLOAT
                        GParamSpecFloat;
    GParamSpec*         g_param_spec_float                  (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             gfloat minimum,
                                                             gfloat maximum,
                                                             gfloat default_value,
                                                             GParamFlags flags);
    void                g_value_set_float                   (GValue *value,
                                                             gfloat v_float);
    gfloat              g_value_get_float                   (const GValue *value);

    #define             G_IS_PARAM_SPEC_DOUBLE              (pspec)
    #define             G_PARAM_SPEC_DOUBLE                 (pspec)
    #define             G_VALUE_HOLDS_DOUBLE                (value)
    #define             G_TYPE_PARAM_DOUBLE
                        GParamSpecDouble;
    GParamSpec*         g_param_spec_double                 (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             gdouble minimum,
                                                             gdouble maximum,
                                                             gdouble default_value,
                                                             GParamFlags flags);
    void                g_value_set_double                  (GValue *value,
                                                             gdouble v_double);
    gdouble             g_value_get_double                  (const GValue *value);

    #define             G_IS_PARAM_SPEC_ENUM                (pspec)
    #define             G_PARAM_SPEC_ENUM                   (pspec)
    #define             G_VALUE_HOLDS_ENUM                  (value)
    #define             G_TYPE_PARAM_ENUM
                        GParamSpecEnum;
    GParamSpec*         g_param_spec_enum                   (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             GType enum_type,
                                                             gint default_value,
                                                             GParamFlags flags);
    void                g_value_set_enum                    (GValue *value,
                                                             gint v_enum);
    gint                g_value_get_enum                    (const GValue *value);

    #define             G_IS_PARAM_SPEC_FLAGS               (pspec)
    #define             G_PARAM_SPEC_FLAGS                  (pspec)
    #define             G_VALUE_HOLDS_FLAGS                 (value)
    #define             G_TYPE_PARAM_FLAGS
                        GParamSpecFlags;
    GParamSpec*         g_param_spec_flags                  (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             GType flags_type,
                                                             guint default_value,
                                                             GParamFlags flags);
    void                g_value_set_flags                   (GValue *value,
                                                             guint v_flags);
    guint               g_value_get_flags                   (const GValue *value);

    #define             G_IS_PARAM_SPEC_STRING              (pspec)
    #define             G_PARAM_SPEC_STRING                 (pspec)
    #define             G_VALUE_HOLDS_STRING                (value)
    #define             G_TYPE_PARAM_STRING
                        GParamSpecString;
    typedef             gchararray;
    GParamSpec*         g_param_spec_string                 (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             const gchar *default_value,
                                                             GParamFlags flags);
    void                g_value_set_string                  (GValue *value,
                                                             const gchar *v_string);
    void                g_value_set_static_string           (GValue *value,
                                                             const gchar *v_string);
    void                g_value_take_string                 (GValue *value,
                                                             gchar *v_string);
    void                g_value_set_string_take_ownership   (GValue *value,
                                                             gchar *v_string);
    const gchar*        g_value_get_string                  (const GValue *value);
    gchar*              g_value_dup_string                  (const GValue *value);

    #define             G_IS_PARAM_SPEC_PARAM               (pspec)
    #define             G_PARAM_SPEC_PARAM                  (pspec)
    #define             G_VALUE_HOLDS_PARAM                 (value)
    #define             G_TYPE_PARAM_PARAM
                        GParamSpecParam;
    GParamSpec*         g_param_spec_param                  (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             GType param_type,
                                                             GParamFlags flags);
    void                g_value_set_param                   (GValue *value,
                                                             GParamSpec *param);
    void                g_value_take_param                  (GValue *value,
                                                             GParamSpec *param);
    void                g_value_set_param_take_ownership    (GValue *value,
                                                             GParamSpec *param);
    GParamSpec*         g_value_get_param                   (const GValue *value);
    GParamSpec*         g_value_dup_param                   (const GValue *value);

    #define             G_IS_PARAM_SPEC_BOXED               (pspec)
    #define             G_PARAM_SPEC_BOXED                  (pspec)
    #define             G_VALUE_HOLDS_BOXED                 (value)
    #define             G_TYPE_PARAM_BOXED
                        GParamSpecBoxed;
    GParamSpec*         g_param_spec_boxed                  (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             GType boxed_type,
                                                             GParamFlags flags);
    void                g_value_set_boxed                   (GValue *value,
                                                             gconstpointer v_boxed);
    void                g_value_set_static_boxed            (GValue *value,
                                                             gconstpointer v_boxed);
    void                g_value_take_boxed                  (GValue *value,
                                                             gconstpointer v_boxed);
    void                g_value_set_boxed_take_ownership    (GValue *value,
                                                             gconstpointer v_boxed);
    gpointer            g_value_get_boxed                   (const GValue *value);
    gpointer            g_value_dup_boxed                   (const GValue *value);

    #define             G_IS_PARAM_SPEC_POINTER             (pspec)
    #define             G_PARAM_SPEC_POINTER                (pspec)
    #define             G_VALUE_HOLDS_POINTER               (value)
    #define             G_TYPE_PARAM_POINTER
                        GParamSpecPointer;
    GParamSpec*         g_param_spec_pointer                (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             GParamFlags flags);
    void                g_value_set_pointer                 (GValue *value,
                                                             gpointer v_pointer);
    gpointer            g_value_get_pointer                 (const GValue *value);

    #define             G_IS_PARAM_SPEC_OBJECT              (pspec)
    #define             G_PARAM_SPEC_OBJECT                 (pspec)
    #define             G_VALUE_HOLDS_OBJECT                (value)
    #define             G_TYPE_PARAM_OBJECT
                        GParamSpecObject;
    GParamSpec*         g_param_spec_object                 (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             GType object_type,
                                                             GParamFlags flags);
    void                g_value_set_object                  (GValue *value,
                                                             gpointer v_object);
    void                g_value_take_object                 (GValue *value,
                                                             gpointer v_object);
    void                g_value_set_object_take_ownership   (GValue *value,
                                                             gpointer v_object);
    gpointer            g_value_get_object                  (const GValue *value);
    GObject*            g_value_dup_object                  (const GValue *value);

    #define             G_IS_PARAM_SPEC_UNICHAR             (pspec)
    #define             G_PARAM_SPEC_UNICHAR                (pspec)
    #define             G_TYPE_PARAM_UNICHAR
                        GParamSpecUnichar;
    GParamSpec*         g_param_spec_unichar                (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             gunichar default_value,
                                                             GParamFlags flags);

    #define             G_IS_PARAM_SPEC_VALUE_ARRAY         (pspec)
    #define             G_PARAM_SPEC_VALUE_ARRAY            (pspec)
    #define             G_TYPE_PARAM_VALUE_ARRAY
                        GParamSpecValueArray;
    GParamSpec*         g_param_spec_value_array            (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             GParamSpec *element_spec,
                                                             GParamFlags flags);

    #define             G_IS_PARAM_SPEC_OVERRIDE            (pspec)
    #define             G_PARAM_SPEC_OVERRIDE               (pspec)
    #define             G_TYPE_PARAM_OVERRIDE
                        GParamSpecOverride;
    GParamSpec*         g_param_spec_override               (const gchar *name,
                                                             GParamSpec *overridden);

    #define             G_IS_PARAM_SPEC_GTYPE               (pspec)
    #define             G_PARAM_SPEC_GTYPE                  (pspec)
    #define             G_VALUE_HOLDS_GTYPE                 (value)
    #define             G_TYPE_PARAM_GTYPE
                        GParamSpecGType;
    GParamSpec*         g_param_spec_gtype                  (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             GType is_a_type,
                                                             GParamFlags flags);
    GType               g_value_get_gtype                   (const GValue *value);
    void                g_value_set_gtype                   (GValue *value,
                                                             GType v_gtype);

## Description

GValue provides an abstract container structure which can be copied, transformed and compared while holding a value of any (derived) type, which is registered as a GType with a GTypeValueTable in its GTypeInfo structure. Parameter specifications for most value types can be created as GParamSpec derived instances, to implement e.g. GObject properties which operate on GValue containers.

Parameter names need to start with a letter (a-z or A-Z). Subsequent characters can be letters, numbers or a '-'. All other characters are replaced by a '-' during construction.

## Details

### G_IS_PARAM_SPEC_BOOLEAN()

    #define G_IS_PARAM_SPEC_BOOLEAN(pspec)     (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), G_TYPE_PARAM_BOOLEAN))

Return whether the given GParamSpec is of type `G_TYPE_PARAM_BOOLEAN`.

`pspec` :

  a valid GParamSpec instance

### G_PARAM_SPEC_BOOLEAN()

    #define G_PARAM_SPEC_BOOLEAN(pspec)        (G_TYPE_CHECK_INSTANCE_CAST ((pspec), G_TYPE_PARAM_BOOLEAN, GParamSpecBoolean))

Cast a GParamSpec instance into a GParamSpecBoolean.

`pspec` :

  a valid GParamSpec instance

### G_VALUE_HOLDS_BOOLEAN()

    #define G_VALUE_HOLDS_BOOLEAN(value)	 (G_TYPE_CHECK_VALUE_TYPE ((value), G_TYPE_BOOLEAN))

Return whether the given GValue can hold values of type `G_TYPE_BOOLEAN`.

`value` :

  a valid GValue structure

### G_TYPE_PARAM_BOOLEAN

    #define	G_TYPE_PARAM_BOOLEAN		   (g_param_spec_types[2])

The GType of GParamSpecBoolean.

### GParamSpecBoolean

    typedef struct {
      GParamSpec    parent_instance;

      gboolean      default_value;
    } GParamSpecBoolean;

A GParamSpec derived structure that contains the meta data for boolean properties.

GParamSpec parent_instance;

  private GParamSpec portion

gboolean default_value;

  default value for the property specified

### g_param_spec_boolean ()

    GParamSpec*         g_param_spec_boolean                (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             gboolean default_value,
                                                             GParamFlags flags);

Creates a new GParamSpecBoolean instance specifying a `G_TYPE_BOOLEAN` property.

See `g_param_spec_internal()` for details on property names.

`name` :

  canonical name of the property specified

`nick` :

  nick name for the property specified

`blurb` :

  description of the property specified

`default_value` :

  default value for the property specified

`flags` :

  flags for the property specified

Returns :

  a newly created parameter specification

### g_value_set_boolean ()

    void                g_value_set_boolean                 (GValue *value,
                                                             gboolean v_boolean);

Set the contents of a `G_TYPE_BOOLEAN` GValue to `v_boolean`.

`value` :

  a valid GValue of type `G_TYPE_BOOLEAN`

`v_boolean` :

  boolean value to be set

### g_value_get_boolean ()

    gboolean            g_value_get_boolean                 (const GValue *value);

Get the contents of a `G_TYPE_BOOLEAN` GValue.

`value` :

  a valid GValue of type `G_TYPE_BOOLEAN`

Returns :

  boolean contents of `value`

### G_IS_PARAM_SPEC_CHAR()

    #define G_IS_PARAM_SPEC_CHAR(pspec)        (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), G_TYPE_PARAM_CHAR))

Return whether the given GParamSpec is of type `G_TYPE_PARAM_CHAR`.

`pspec` :

  a valid GParamSpec instance

### G_PARAM_SPEC_CHAR()

    #define G_PARAM_SPEC_CHAR(pspec)           (G_TYPE_CHECK_INSTANCE_CAST ((pspec), G_TYPE_PARAM_CHAR, GParamSpecChar))

Cast a GParamSpec instance into a GParamSpecChar.

`pspec` :

  a valid GParamSpec instance

### G_VALUE_HOLDS_CHAR()

    #define G_VALUE_HOLDS_CHAR(value)	 (G_TYPE_CHECK_VALUE_TYPE ((value), G_TYPE_CHAR))

Return whether the given GValue can hold values of type `G_TYPE_CHAR`.

`value` :

  a valid GValue structure

### G_TYPE_PARAM_CHAR

    #define	G_TYPE_PARAM_CHAR		   (g_param_spec_types[0])

The GType of GParamSpecChar.

### GParamSpecChar

    typedef struct {
      GParamSpec    parent_instance;

      gint8         minimum;
      gint8         maximum;
      gint8         default_value;
    } GParamSpecChar;

A GParamSpec derived structure that contains the meta data for character properties.

GParamSpec parent_instance;

  private GParamSpec portion

gint8 minimum;

  minimum value for the property specified

gint8 maximum;

  maximum value for the property specified

gint8 default_value;

  default value for the property specified

### g_param_spec_char ()

    GParamSpec*         g_param_spec_char                   (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             gint8 minimum,
                                                             gint8 maximum,
                                                             gint8 default_value,
                                                             GParamFlags flags);

Creates a new GParamSpecChar instance specifying a `G_TYPE_CHAR` property.

`name` :

  canonical name of the property specified

`nick` :

  nick name for the property specified

`blurb` :

  description of the property specified

`minimum` :

  minimum value for the property specified

`maximum` :

  maximum value for the property specified

`default_value` :

  default value for the property specified

`flags` :

  flags for the property specified

Returns :

  a newly created parameter specification

### g_value_set_char ()

    void                g_value_set_char                    (GValue *value,
                                                             gchar v_char);

Set the contents of a `G_TYPE_CHAR` GValue to `v_char`.

`value` :

  a valid GValue of type `G_TYPE_CHAR`

`v_char` :

  character value to be set

### g_value_get_char ()

    gchar               g_value_get_char                    (const GValue *value);

Get the contents of a `G_TYPE_CHAR` GValue.

`value` :

  a valid GValue of type `G_TYPE_CHAR`

Returns :

  character contents of `value`

### G_IS_PARAM_SPEC_UCHAR()

    #define G_IS_PARAM_SPEC_UCHAR(pspec)       (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), G_TYPE_PARAM_UCHAR))

Return whether the given GParamSpec is of type `G_TYPE_PARAM_UCHAR`.

`pspec` :

  a valid GParamSpec instance

### G_PARAM_SPEC_UCHAR()

    #define G_PARAM_SPEC_UCHAR(pspec)          (G_TYPE_CHECK_INSTANCE_CAST ((pspec), G_TYPE_PARAM_UCHAR, GParamSpecUChar))

Cast a GParamSpec instance into a GParamSpecUChar.

`pspec` :

  a valid GParamSpec instance

### G_VALUE_HOLDS_UCHAR()

    #define G_VALUE_HOLDS_UCHAR(value)	 (G_TYPE_CHECK_VALUE_TYPE ((value), G_TYPE_UCHAR))

Return whether the given GValue can hold values of type `G_TYPE_UCHAR`.

`value` :

  a valid GValue structure

### G_TYPE_PARAM_UCHAR

    #define	G_TYPE_PARAM_UCHAR		   (g_param_spec_types[1])

The GType of GParamSpecUChar.

### GParamSpecUChar

    typedef struct {
      GParamSpec    parent_instance;

      guint8        minimum;
      guint8        maximum;
      guint8        default_value;
    } GParamSpecUChar;

A GParamSpec derived structure that contains the meta data for unsigned character properties.

GParamSpec parent_instance;

  private GParamSpec portion

guint8 minimum;

  minimum value for the property specified

guint8 maximum;

  maximum value for the property specified

guint8 default_value;

  default value for the property specified

### g_param_spec_uchar ()

    GParamSpec*         g_param_spec_uchar                  (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             guint8 minimum,
                                                             guint8 maximum,
                                                             guint8 default_value,
                                                             GParamFlags flags);

Creates a new GParamSpecUChar instance specifying a `G_TYPE_UCHAR` property.

`name` :

  canonical name of the property specified

`nick` :

  nick name for the property specified

`blurb` :

  description of the property specified

`minimum` :

  minimum value for the property specified

`maximum` :

  maximum value for the property specified

`default_value` :

  default value for the property specified

`flags` :

  flags for the property specified

Returns :

  a newly created parameter specification

### g_value_set_uchar ()

    void                g_value_set_uchar                   (GValue *value,
                                                             guchar v_uchar);

Set the contents of a `G_TYPE_UCHAR` GValue to `v_uchar`.

`value` :

  a valid GValue of type `G_TYPE_UCHAR`

`v_uchar` :

  unsigned character value to be set

### g_value_get_uchar ()

    guchar              g_value_get_uchar                   (const GValue *value);

Get the contents of a `G_TYPE_UCHAR` GValue.

`value` :

  a valid GValue of type `G_TYPE_UCHAR`

Returns :

  unsigned character contents of `value`

### G_IS_PARAM_SPEC_INT()

    #define G_IS_PARAM_SPEC_INT(pspec)         (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), G_TYPE_PARAM_INT))

Return whether the given GParamSpec is of type `G_TYPE_PARAM_INT`.

`pspec` :

  a valid GParamSpec instance

### G_PARAM_SPEC_INT()

    #define G_PARAM_SPEC_INT(pspec)            (G_TYPE_CHECK_INSTANCE_CAST ((pspec), G_TYPE_PARAM_INT, GParamSpecInt))

Cast a GParamSpec instance into a GParamSpecInt.

`pspec` :

  a valid GParamSpec instance

### G_VALUE_HOLDS_INT()

    #define G_VALUE_HOLDS_INT(value)	 (G_TYPE_CHECK_VALUE_TYPE ((value), G_TYPE_INT))

Return whether the given GValue can hold values of type `G_TYPE_INT`.

`value` :

  a valid GValue structure

### G_TYPE_PARAM_INT

    #define	G_TYPE_PARAM_INT		   (g_param_spec_types[3])

The GType of GParamSpecInt.

### GParamSpecInt

    typedef struct {
      GParamSpec    parent_instance;

      gint          minimum;
      gint          maximum;
      gint          default_value;
    } GParamSpecInt;

A GParamSpec derived structure that contains the meta data for integer properties.

GParamSpec parent_instance;

  private GParamSpec portion

gint minimum;

  minimum value for the property specified

gint maximum;

  maximum value for the property specified

gint default_value;

  default value for the property specified

### g_param_spec_int ()

    GParamSpec*         g_param_spec_int                    (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             gint minimum,
                                                             gint maximum,
                                                             gint default_value,
                                                             GParamFlags flags);

Creates a new GParamSpecInt instance specifying a `G_TYPE_INT` property.

See `g_param_spec_internal()` for details on property names.

`name` :

  canonical name of the property specified

`nick` :

  nick name for the property specified

`blurb` :

  description of the property specified

`minimum` :

  minimum value for the property specified

`maximum` :

  maximum value for the property specified

`default_value` :

  default value for the property specified

`flags` :

  flags for the property specified

Returns :

  a newly created parameter specification

### g_value_set_int ()

    void                g_value_set_int                     (GValue *value,
                                                             gint v_int);

Set the contents of a `G_TYPE_INT` GValue to `v_int`.

`value` :

  a valid GValue of type `G_TYPE_INT`

`v_int` :

  integer value to be set

### g_value_get_int ()

    gint                g_value_get_int                     (const GValue *value);

Get the contents of a `G_TYPE_INT` GValue.

`value` :

  a valid GValue of type `G_TYPE_INT`

Returns :

  integer contents of `value`

### G_IS_PARAM_SPEC_UINT()

    #define G_IS_PARAM_SPEC_UINT(pspec)        (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), G_TYPE_PARAM_UINT))

Return whether the given GParamSpec is of type `G_TYPE_PARAM_UINT`.

`pspec` :

  a valid GParamSpec instance

### G_PARAM_SPEC_UINT()

    #define G_PARAM_SPEC_UINT(pspec)           (G_TYPE_CHECK_INSTANCE_CAST ((pspec), G_TYPE_PARAM_UINT, GParamSpecUInt))

Cast a GParamSpec instance into a GParamSpecUInt.

`pspec` :

  a valid GParamSpec instance

### G_VALUE_HOLDS_UINT()

    #define G_VALUE_HOLDS_UINT(value)	 (G_TYPE_CHECK_VALUE_TYPE ((value), G_TYPE_UINT))

Return whether the given GValue can hold values of type `G_TYPE_UINT`.

`value` :

  a valid GValue structure

### G_TYPE_PARAM_UINT

    #define	G_TYPE_PARAM_UINT		   (g_param_spec_types[4])

The GType of GParamSpecUInt.

### GParamSpecUInt

    typedef struct {
      GParamSpec    parent_instance;

      guint         minimum;
      guint         maximum;
      guint         default_value;
    } GParamSpecUInt;

A GParamSpec derived structure that contains the meta data for unsigned integer properties.

GParamSpec parent_instance;

  private GParamSpec portion

guint minimum;

  minimum value for the property specified

guint maximum;

  maximum value for the property specified

guint default_value;

  default value for the property specified

### g_param_spec_uint ()

    GParamSpec*         g_param_spec_uint                   (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             guint minimum,
                                                             guint maximum,
                                                             guint default_value,
                                                             GParamFlags flags);

Creates a new GParamSpecUInt instance specifying a `G_TYPE_UINT` property.

See `g_param_spec_internal()` for details on property names.

`name` :

  canonical name of the property specified

`nick` :

  nick name for the property specified

`blurb` :

  description of the property specified

`minimum` :

  minimum value for the property specified

`maximum` :

  maximum value for the property specified

`default_value` :

  default value for the property specified

`flags` :

  flags for the property specified

Returns :

  a newly created parameter specification

### g_value_set_uint ()

    void                g_value_set_uint                    (GValue *value,
                                                             guint v_uint);

Set the contents of a `G_TYPE_UINT` GValue to `v_uint`.

`value` :

  a valid GValue of type `G_TYPE_UINT`

`v_uint` :

  unsigned integer value to be set

### g_value_get_uint ()

    guint               g_value_get_uint                    (const GValue *value);

Get the contents of a `G_TYPE_UINT` GValue.

`value` :

  a valid GValue of type `G_TYPE_UINT`

Returns :

  unsigned integer contents of `value`

### G_IS_PARAM_SPEC_LONG()

    #define G_IS_PARAM_SPEC_LONG(pspec)        (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), G_TYPE_PARAM_LONG))

Return whether the given GParamSpec is of type `G_TYPE_PARAM_LONG`.

`pspec` :

  a valid GParamSpec instance

### G_PARAM_SPEC_LONG()

    #define G_PARAM_SPEC_LONG(pspec)           (G_TYPE_CHECK_INSTANCE_CAST ((pspec), G_TYPE_PARAM_LONG, GParamSpecLong))

Cast a GParamSpec instance into a GParamSpecLong.

`pspec` :

  a valid GParamSpec instance

### G_VALUE_HOLDS_LONG()

    #define G_VALUE_HOLDS_LONG(value)	 (G_TYPE_CHECK_VALUE_TYPE ((value), G_TYPE_LONG))

Return whether the given GValue can hold values of type `G_TYPE_LONG`.

`value` :

  a valid GValue structure

### G_TYPE_PARAM_LONG

    #define	G_TYPE_PARAM_LONG		   (g_param_spec_types[5])

The GType of GParamSpecLong.

### GParamSpecLong

    typedef struct {
      GParamSpec    parent_instance;

      glong         minimum;
      glong         maximum;
      glong         default_value;
    } GParamSpecLong;

A GParamSpec derived structure that contains the meta data for long integer properties.

GParamSpec parent_instance;

  private GParamSpec portion

glong minimum;

  minimum value for the property specified

glong maximum;

  maximum value for the property specified

glong default_value;

  default value for the property specified

### g_param_spec_long ()

    GParamSpec*         g_param_spec_long                   (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             glong minimum,
                                                             glong maximum,
                                                             glong default_value,
                                                             GParamFlags flags);

Creates a new GParamSpecLong instance specifying a `G_TYPE_LONG` property.

See `g_param_spec_internal()` for details on property names.

`name` :

  canonical name of the property specified

`nick` :

  nick name for the property specified

`blurb` :

  description of the property specified

`minimum` :

  minimum value for the property specified

`maximum` :

  maximum value for the property specified

`default_value` :

  default value for the property specified

`flags` :

  flags for the property specified

Returns :

  a newly created parameter specification

### g_value_set_long ()

    void                g_value_set_long                    (GValue *value,
                                                             glong v_long);

Set the contents of a `G_TYPE_LONG` GValue to `v_long`.

`value` :

  a valid GValue of type `G_TYPE_LONG`

`v_long` :

  long integer value to be set

### g_value_get_long ()

    glong               g_value_get_long                    (const GValue *value);

Get the contents of a `G_TYPE_LONG` GValue.

`value` :

  a valid GValue of type `G_TYPE_LONG`

Returns :

  long integer contents of `value`

### G_IS_PARAM_SPEC_ULONG()

    #define G_IS_PARAM_SPEC_ULONG(pspec)       (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), G_TYPE_PARAM_ULONG))

Return whether the given GParamSpec is of type `G_TYPE_PARAM_ULONG`.

`pspec` :

  a valid GParamSpec instance

### G_PARAM_SPEC_ULONG()

    #define G_PARAM_SPEC_ULONG(pspec)          (G_TYPE_CHECK_INSTANCE_CAST ((pspec), G_TYPE_PARAM_ULONG, GParamSpecULong))

Cast a GParamSpec instance into a GParamSpecULong.

`pspec` :

  a valid GParamSpec instance

### G_VALUE_HOLDS_ULONG()

    #define G_VALUE_HOLDS_ULONG(value)	 (G_TYPE_CHECK_VALUE_TYPE ((value), G_TYPE_ULONG))

Return whether the given GValue can hold values of type `G_TYPE_ULONG`.

`value` :

  a valid GValue structure

### G_TYPE_PARAM_ULONG

    #define	G_TYPE_PARAM_ULONG		   (g_param_spec_types[6])

The GType of GParamSpecULong.

### GParamSpecULong

    typedef struct {
      GParamSpec    parent_instance;

      gulong        minimum;
      gulong        maximum;
      gulong        default_value;
    } GParamSpecULong;

A GParamSpec derived structure that contains the meta data for unsigned long integer properties.

GParamSpec parent_instance;

  private GParamSpec portion

gulong minimum;

  minimum value for the property specified

gulong maximum;

  maximum value for the property specified

gulong default_value;

  default value for the property specified

### g_param_spec_ulong ()

    GParamSpec*         g_param_spec_ulong                  (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             gulong minimum,
                                                             gulong maximum,
                                                             gulong default_value,
                                                             GParamFlags flags);

Creates a new GParamSpecULong instance specifying a `G_TYPE_ULONG` property.

See `g_param_spec_internal()` for details on property names.

`name` :

  canonical name of the property specified

`nick` :

  nick name for the property specified

`blurb` :

  description of the property specified

`minimum` :

  minimum value for the property specified

`maximum` :

  maximum value for the property specified

`default_value` :

  default value for the property specified

`flags` :

  flags for the property specified

Returns :

  a newly created parameter specification

### g_value_set_ulong ()

    void                g_value_set_ulong                   (GValue *value,
                                                             gulong v_ulong);

Set the contents of a `G_TYPE_ULONG` GValue to `v_ulong`.

`value` :

  a valid GValue of type `G_TYPE_ULONG`

`v_ulong` :

  unsigned long integer value to be set

### g_value_get_ulong ()

    gulong              g_value_get_ulong                   (const GValue *value);

Get the contents of a `G_TYPE_ULONG` GValue.

`value` :

  a valid GValue of type `G_TYPE_ULONG`

Returns :

  unsigned long integer contents of `value`

### G_IS_PARAM_SPEC_INT64()

    #define G_IS_PARAM_SPEC_INT64(pspec)       (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), G_TYPE_PARAM_INT64))

Return whether the given GParamSpec is of type `G_TYPE_PARAM_INT64`.

`pspec` :

  a valid GParamSpec instance

### G_PARAM_SPEC_INT64()

    #define G_PARAM_SPEC_INT64(pspec)          (G_TYPE_CHECK_INSTANCE_CAST ((pspec), G_TYPE_PARAM_INT64, GParamSpecInt64))

Cast a GParamSpec instance into a GParamSpecInt64.

`pspec` :

  a valid GParamSpec instance

### G_VALUE_HOLDS_INT64()

    #define G_VALUE_HOLDS_INT64(value)	 (G_TYPE_CHECK_VALUE_TYPE ((value), G_TYPE_INT64))

Return whether the given GValue can hold values of type `G_TYPE_INT64`.

`value` :

  a valid GValue structure

### G_TYPE_PARAM_INT64

    #define	G_TYPE_PARAM_INT64		   (g_param_spec_types[7])

The GType of GParamSpecInt64.

### GParamSpecInt64

    typedef struct {
      GParamSpec    parent_instance;

      gint64        minimum;
      gint64        maximum;
      gint64        default_value;
    } GParamSpecInt64;

A GParamSpec derived structure that contains the meta data for 64bit integer properties.

GParamSpec parent_instance;

  private GParamSpec portion

gint64 minimum;

  minimum value for the property specified

gint64 maximum;

  maximum value for the property specified

gint64 default_value;

  default value for the property specified

### g_param_spec_int64 ()

    GParamSpec*         g_param_spec_int64                  (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             gint64 minimum,
                                                             gint64 maximum,
                                                             gint64 default_value,
                                                             GParamFlags flags);

Creates a new GParamSpecInt64 instance specifying a `G_TYPE_INT64` property.

See `g_param_spec_internal()` for details on property names.

`name` :

  canonical name of the property specified

`nick` :

  nick name for the property specified

`blurb` :

  description of the property specified

`minimum` :

  minimum value for the property specified

`maximum` :

  maximum value for the property specified

`default_value` :

  default value for the property specified

`flags` :

  flags for the property specified

Returns :

  a newly created parameter specification

### g_value_set_int64 ()

    void                g_value_set_int64                   (GValue *value,
                                                             gint64 v_int64);

Set the contents of a `G_TYPE_INT64` GValue to `v_int64`.

`value` :

  a valid GValue of type `G_TYPE_INT64`

`v_int64` :

  64bit integer value to be set

### g_value_get_int64 ()

    gint64              g_value_get_int64                   (const GValue *value);

Get the contents of a `G_TYPE_INT64` GValue.

`value` :

  a valid GValue of type `G_TYPE_INT64`

Returns :

  64bit integer contents of `value`

### G_IS_PARAM_SPEC_UINT64()

    #define G_IS_PARAM_SPEC_UINT64(pspec)      (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), G_TYPE_PARAM_UINT64))

Return whether the given GParamSpec is of type `G_TYPE_PARAM_UINT64`.

`pspec` :

  a valid GParamSpec instance

### G_PARAM_SPEC_UINT64()

    #define G_PARAM_SPEC_UINT64(pspec)         (G_TYPE_CHECK_INSTANCE_CAST ((pspec), G_TYPE_PARAM_UINT64, GParamSpecUInt64))

Cast a GParamSpec instance into a GParamSpecUInt64.

`pspec` :

  a valid GParamSpec instance

### G_VALUE_HOLDS_UINT64()

    #define G_VALUE_HOLDS_UINT64(value)	 (G_TYPE_CHECK_VALUE_TYPE ((value), G_TYPE_UINT64))

Return whether the given GValue can hold values of type `G_TYPE_UINT64`.

`value` :

  a valid GValue structure

### G_TYPE_PARAM_UINT64

    #define	G_TYPE_PARAM_UINT64		   (g_param_spec_types[8])

The GType of GParamSpecUInt64.

### GParamSpecUInt64

    typedef struct {
      GParamSpec    parent_instance;

      guint64       minimum;
      guint64       maximum;
      guint64       default_value;
    } GParamSpecUInt64;

A GParamSpec derived structure that contains the meta data for unsigned 64bit integer properties.

GParamSpec parent_instance;

  private GParamSpec portion

guint64 minimum;

  minimum value for the property specified

guint64 maximum;

  maximum value for the property specified

guint64 default_value;

  default value for the property specified

### g_param_spec_uint64 ()

    GParamSpec*         g_param_spec_uint64                 (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             guint64 minimum,
                                                             guint64 maximum,
                                                             guint64 default_value,
                                                             GParamFlags flags);

Creates a new GParamSpecUInt64 instance specifying a `G_TYPE_UINT64` property.

See `g_param_spec_internal()` for details on property names.

`name` :

  canonical name of the property specified

`nick` :

  nick name for the property specified

`blurb` :

  description of the property specified

`minimum` :

  minimum value for the property specified

`maximum` :

  maximum value for the property specified

`default_value` :

  default value for the property specified

`flags` :

  flags for the property specified

Returns :

  a newly created parameter specification

### g_value_set_uint64 ()

    void                g_value_set_uint64                  (GValue *value,
                                                             guint64 v_uint64);

Set the contents of a `G_TYPE_UINT64` GValue to `v_uint64`.

`value` :

  a valid GValue of type `G_TYPE_UINT64`

`v_uint64` :

  unsigned 64bit integer value to be set

### g_value_get_uint64 ()

    guint64             g_value_get_uint64                  (const GValue *value);

Get the contents of a `G_TYPE_UINT64` GValue.

`value` :

  a valid GValue of type `G_TYPE_UINT64`

Returns :

  unsigned 64bit integer contents of `value`

### G_IS_PARAM_SPEC_FLOAT()

    #define G_IS_PARAM_SPEC_FLOAT(pspec)       (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), G_TYPE_PARAM_FLOAT))

Return whether the given GParamSpec is of type `G_TYPE_PARAM_FLOAT`.

`pspec` :

  a valid GParamSpec instance

### G_PARAM_SPEC_FLOAT()

    #define G_PARAM_SPEC_FLOAT(pspec)          (G_TYPE_CHECK_INSTANCE_CAST ((pspec), G_TYPE_PARAM_FLOAT, GParamSpecFloat))

Cast a GParamSpec instance into a GParamSpecFloat.

`pspec` :

  a valid GParamSpec instance

### G_VALUE_HOLDS_FLOAT()

    #define G_VALUE_HOLDS_FLOAT(value)	 (G_TYPE_CHECK_VALUE_TYPE ((value), G_TYPE_FLOAT))

Return whether the given GValue can hold values of type `G_TYPE_FLOAT`.

`value` :

  a valid GValue structure

### G_TYPE_PARAM_FLOAT

    #define	G_TYPE_PARAM_FLOAT		   (g_param_spec_types[12])

The GType of GParamSpecFloat.

### GParamSpecFloat

    typedef struct {
      GParamSpec    parent_instance;

      gfloat        minimum;
      gfloat        maximum;
      gfloat        default_value;
      gfloat        epsilon;
    } GParamSpecFloat;

A GParamSpec derived structure that contains the meta data for float properties.

GParamSpec parent_instance;

  private GParamSpec portion

gfloat minimum;

  minimum value for the property specified

gfloat maximum;

  maximum value for the property specified

gfloat default_value;

  default value for the property specified

gfloat epsilon;

  values closer than `epsilon` will be considered identical by `g_param_values_cmp()`; the default value is 1e-30.

### g_param_spec_float ()

    GParamSpec*         g_param_spec_float                  (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             gfloat minimum,
                                                             gfloat maximum,
                                                             gfloat default_value,
                                                             GParamFlags flags);

Creates a new GParamSpecFloat instance specifying a `G_TYPE_FLOAT` property.

See `g_param_spec_internal()` for details on property names.

`name` :

  canonical name of the property specified

`nick` :

  nick name for the property specified

`blurb` :

  description of the property specified

`minimum` :

  minimum value for the property specified

`maximum` :

  maximum value for the property specified

`default_value` :

  default value for the property specified

`flags` :

  flags for the property specified

Returns :

  a newly created parameter specification

### g_value_set_float ()

    void                g_value_set_float                   (GValue *value,
                                                             gfloat v_float);

Set the contents of a `G_TYPE_FLOAT` GValue to `v_float`.

`value` :

  a valid GValue of type `G_TYPE_FLOAT`

`v_float` :

  float value to be set

### g_value_get_float ()

    gfloat              g_value_get_float                   (const GValue *value);

Get the contents of a `G_TYPE_FLOAT` GValue.

`value` :

  a valid GValue of type `G_TYPE_FLOAT`

Returns :

  float contents of `value`

### G_IS_PARAM_SPEC_DOUBLE()

    #define G_IS_PARAM_SPEC_DOUBLE(pspec)      (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), G_TYPE_PARAM_DOUBLE))

Return whether the given GParamSpec is of type `G_TYPE_PARAM_DOUBLE`.

`pspec` :

  a valid GParamSpec instance

### G_PARAM_SPEC_DOUBLE()

    #define G_PARAM_SPEC_DOUBLE(pspec)         (G_TYPE_CHECK_INSTANCE_CAST ((pspec), G_TYPE_PARAM_DOUBLE, GParamSpecDouble))

Cast a GParamSpec instance into a GParamSpecDouble.

`pspec` :

  a valid GParamSpec instance

### G_VALUE_HOLDS_DOUBLE()

    #define G_VALUE_HOLDS_DOUBLE(value)	 (G_TYPE_CHECK_VALUE_TYPE ((value), G_TYPE_DOUBLE))

Return whether the given GValue can hold values of type `G_TYPE_DOUBLE`.

`value` :

  a valid GValue structure

### G_TYPE_PARAM_DOUBLE

    #define	G_TYPE_PARAM_DOUBLE		   (g_param_spec_types[13])

The GType of GParamSpecDouble.

### GParamSpecDouble

    typedef struct {
      GParamSpec    parent_instance;

      gdouble       minimum;
      gdouble       maximum;
      gdouble       default_value;
      gdouble       epsilon;
    } GParamSpecDouble;

A GParamSpec derived structure that contains the meta data for double properties.

GParamSpec parent_instance;

  private GParamSpec portion

gdouble minimum;

  minimum value for the property specified

gdouble maximum;

  maximum value for the property specified

gdouble default_value;

  default value for the property specified

gdouble epsilon;

  values closer than `epsilon` will be considered identical by `g_param_values_cmp()`; the default value is 1e-90.

### g_param_spec_double ()

    GParamSpec*         g_param_spec_double                 (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             gdouble minimum,
                                                             gdouble maximum,
                                                             gdouble default_value,
                                                             GParamFlags flags);

Creates a new GParamSpecDouble instance specifying a `G_TYPE_DOUBLE` property.

See `g_param_spec_internal()` for details on property names.

`name` :

  canonical name of the property specified

`nick` :

  nick name for the property specified

`blurb` :

  description of the property specified

`minimum` :

  minimum value for the property specified

`maximum` :

  maximum value for the property specified

`default_value` :

  default value for the property specified

`flags` :

  flags for the property specified

Returns :

  a newly created parameter specification

### g_value_set_double ()

    void                g_value_set_double                  (GValue *value,
                                                             gdouble v_double);

Set the contents of a `G_TYPE_DOUBLE` GValue to `v_double`.

`value` :

  a valid GValue of type `G_TYPE_DOUBLE`

`v_double` :

  double value to be set

### g_value_get_double ()

    gdouble             g_value_get_double                  (const GValue *value);

Get the contents of a `G_TYPE_DOUBLE` GValue.

`value` :

  a valid GValue of type `G_TYPE_DOUBLE`

Returns :

  double contents of `value`

### G_IS_PARAM_SPEC_ENUM()

    #define G_IS_PARAM_SPEC_ENUM(pspec)        (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), G_TYPE_PARAM_ENUM))

Returns whether the given GParamSpec is of type `G_TYPE_PARAM_ENUM`.

`pspec` :

  a valid GParamSpec instance

### G_PARAM_SPEC_ENUM()

    #define G_PARAM_SPEC_ENUM(pspec)           (G_TYPE_CHECK_INSTANCE_CAST ((pspec), G_TYPE_PARAM_ENUM, GParamSpecEnum))

Cast a GParamSpec instance into a GParamSpecEnum.

`pspec` :

  a valid GParamSpec instance

### G_VALUE_HOLDS_ENUM()

    #define G_VALUE_HOLDS_ENUM(value)      (G_TYPE_CHECK_VALUE_TYPE ((value), G_TYPE_ENUM))

Return whether the given GValue can hold values derived from type `G_TYPE_ENUM`.

`value` :

  a valid GValue structure

### G_TYPE_PARAM_ENUM

    #define	G_TYPE_PARAM_ENUM		   (g_param_spec_types[10])

The GType of GParamSpecEnum.

### GParamSpecEnum

    typedef struct {
      GParamSpec    parent_instance;

      GEnumClass   *enum_class;
      gint          default_value;
    } GParamSpecEnum;

A GParamSpec derived structure that contains the meta data for enum properties.

GParamSpec parent_instance;

  private GParamSpec portion

GEnumClass *enum_class;

  the GEnumClass for the enum

gint default_value;

  default value for the property specified

### g_param_spec_enum ()

    GParamSpec*         g_param_spec_enum                   (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             GType enum_type,
                                                             gint default_value,
                                                             GParamFlags flags);

Creates a new GParamSpecEnum instance specifying a `G_TYPE_ENUM` property.

See `g_param_spec_internal()` for details on property names.

`name` :

  canonical name of the property specified

`nick` :

  nick name for the property specified

`blurb` :

  description of the property specified

`enum_type` :

  a GType derived from `G_TYPE_ENUM`

`default_value` :

  default value for the property specified

`flags` :

  flags for the property specified

Returns :

  a newly created parameter specification

### g_value_set_enum ()

    void                g_value_set_enum                    (GValue *value,
                                                             gint v_enum);

Set the contents of a `G_TYPE_ENUM` GValue to `v_enum`.

`value` :

  a valid GValue whose type is derived from `G_TYPE_ENUM`

`v_enum` :

  enum value to be set

### g_value_get_enum ()

    gint                g_value_get_enum                    (const GValue *value);

Get the contents of a `G_TYPE_ENUM` GValue.

`value` :

  a valid GValue whose type is derived from `G_TYPE_ENUM`

Returns :

  enum contents of `value`

### G_IS_PARAM_SPEC_FLAGS()

    #define G_IS_PARAM_SPEC_FLAGS(pspec)       (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), G_TYPE_PARAM_FLAGS))

Returns whether the given GParamSpec is of type `G_TYPE_PARAM_FLAGS`.

`pspec` :

  a valid GParamSpec instance

### G_PARAM_SPEC_FLAGS()

    #define G_PARAM_SPEC_FLAGS(pspec)          (G_TYPE_CHECK_INSTANCE_CAST ((pspec), G_TYPE_PARAM_FLAGS, GParamSpecFlags))

Cast a GParamSpec instance into a GParamSpecFlags.

`pspec` :

  a valid GParamSpec instance

### G_VALUE_HOLDS_FLAGS()

    #define G_VALUE_HOLDS_FLAGS(value)     (G_TYPE_CHECK_VALUE_TYPE ((value), G_TYPE_FLAGS))

Returns whether the given GValue can hold values derived from type `G_TYPE_FLAGS`.

`value` :

  a valid GValue structure

### G_TYPE_PARAM_FLAGS

    #define	G_TYPE_PARAM_FLAGS		   (g_param_spec_types[11])

The GType of GParamSpecFlags.

### GParamSpecFlags

    typedef struct {
      GParamSpec    parent_instance;

      GFlagsClass  *flags_class;
      guint         default_value;
    } GParamSpecFlags;

A GParamSpec derived structure that contains the meta data for flags properties.

GParamSpec parent_instance;

  private GParamSpec portion

GFlagsClass *flags_class;

  the GFlagsClass for the flags

guint default_value;

  default value for the property specified

### g_param_spec_flags ()

    GParamSpec*         g_param_spec_flags                  (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             GType flags_type,
                                                             guint default_value,
                                                             GParamFlags flags);

Creates a new GParamSpecEnum instance specifying a `G_TYPE_FLAGS` property.

See `g_param_spec_internal()` for details on property names.

`name` :

  canonical name of the property specified

`nick` :

  nick name for the property specified

`blurb` :

  description of the property specified

`flags_type` :

  a GType derived from `G_TYPE_FLAGS`

`default_value` :

  default value for the property specified

`flags` :

  flags for the property specified

Returns :

  a newly created parameter specification

### g_value_set_flags ()

    void                g_value_set_flags                   (GValue *value,
                                                             guint v_flags);

Set the contents of a `G_TYPE_FLAGS` GValue to `v_flags`.

`value` :

  a valid GValue whose type is derived from `G_TYPE_FLAGS`

`v_flags` :

  flags value to be set

### g_value_get_flags ()

    guint               g_value_get_flags                   (const GValue *value);

Get the contents of a `G_TYPE_FLAGS` GValue.

`value` :

  a valid GValue whose type is derived from `G_TYPE_FLAGS`

Returns :

  flags contents of `value`

### G_IS_PARAM_SPEC_STRING()

    #define G_IS_PARAM_SPEC_STRING(pspec)      (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), G_TYPE_PARAM_STRING))

Returns whether the given GParamSpec is of type `G_TYPE_PARAM_STRING`.

`pspec` :

  a valid GParamSpec instance

### G_PARAM_SPEC_STRING()

    #define G_PARAM_SPEC_STRING(pspec)         (G_TYPE_CHECK_INSTANCE_CAST ((pspec), G_TYPE_PARAM_STRING, GParamSpecString))

Casts a GParamSpec instance into a GParamSpecString.

`pspec` :

  a valid GParamSpec instance

### G_VALUE_HOLDS_STRING()

    #define G_VALUE_HOLDS_STRING(value)	 (G_TYPE_CHECK_VALUE_TYPE ((value), G_TYPE_STRING))

Return whether the given GValue can hold values of type `G_TYPE_STRING`.

`value` :

  a valid GValue structure

### G_TYPE_PARAM_STRING

    #define	G_TYPE_PARAM_STRING		   (g_param_spec_types[14])

The GType of GParamSpecString.

### GParamSpecString

    typedef struct {
      GParamSpec    parent_instance;

      gchar        *default_value;
      gchar        *cset_first;
      gchar        *cset_nth;
      gchar         substitutor;
      guint         null_fold_if_empty : 1;
      guint         ensure_non_null : 1;
    } GParamSpecString;

A GParamSpec derived structure that contains the meta data for string properties.

GParamSpec parent_instance;

  private GParamSpec portion

gchar *default_value;

  default value for the property specified

gchar *cset_first;

  a string containing the allowed values for the first byte

gchar *cset_nth;

  a string containing the allowed values for the subsequent bytes

gchar substitutor;

  the replacement byte for bytes which don't match `cset_first` or `cset_nth`.

guint null_fold_if_empty : 1;

  replace empty string by `NULL`

guint ensure_non_null : 1;

  replace `NULL` strings by an empty string

### gchararray

    typedef gchar* gchararray;

A C representable type name for G_TYPE_STRING.

### g_param_spec_string ()

    GParamSpec*         g_param_spec_string                 (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             const gchar *default_value,
                                                             GParamFlags flags);

Creates a new GParamSpecString instance.

See `g_param_spec_internal()` for details on property names.

`name` :

  canonical name of the property specified

`nick` :

  nick name for the property specified

`blurb` :

  description of the property specified

`default_value` :

  default value for the property specified

`flags` :

  flags for the property specified

Returns :

  a newly created parameter specification

### g_value_set_string ()

    void                g_value_set_string                  (GValue *value,
                                                             const gchar *v_string);

Set the contents of a `G_TYPE_STRING` GValue to `v_string`.

`value` :

  a valid GValue of type `G_TYPE_STRING`

`v_string` :

  string to be set

### g_value_set_static_string ()

    void                g_value_set_static_string           (GValue *value,
                                                             const gchar *v_string);

Set the contents of a `G_TYPE_STRING` GValue to `v_string`. The string is assumed to be static, and is thus not duplicated when setting the GValue.

`value` :

  a valid GValue of type `G_TYPE_STRING`

`v_string` :

  static string to be set

### g_value_take_string ()

    void                g_value_take_string                 (GValue *value,
                                                             gchar *v_string);

Sets the contents of a `G_TYPE_STRING` GValue to `v_string`.

`value` :

  a valid GValue of type `G_TYPE_STRING`

`v_string` :

  duplicated unowned string to be set

Since 2.4

### g_value_set_string_take_ownership ()

    void                g_value_set_string_take_ownership   (GValue *value,
                                                             gchar *v_string);

`g_value_set_string_take_ownership` has been deprecated since version 2.4 and should not be used in newly-written code. Use `g_value_take_string()` instead.

This is an internal function introduced mainly for C marshallers.

`value` :

  a valid GValue of type `G_TYPE_STRING`

`v_string` :

  duplicated unowned string to be set

### g_value_get_string ()

    const gchar*        g_value_get_string                  (const GValue *value);

Get the contents of a `G_TYPE_STRING` GValue.

`value` :

  a valid GValue of type `G_TYPE_STRING`

Returns :

  string content of `value`

### g_value_dup_string ()

    gchar*              g_value_dup_string                  (const GValue *value);

Get a copy the contents of a `G_TYPE_STRING` GValue.

`value` :

  a valid GValue of type `G_TYPE_STRING`

Returns :

  a newly allocated copy of the string content of `value`

### G_IS_PARAM_SPEC_PARAM()

    #define G_IS_PARAM_SPEC_PARAM(pspec)       (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), G_TYPE_PARAM_PARAM))

Returns whether the given GParamSpec is of type `G_TYPE_PARAM_PARAM`.

`pspec` :

  a valid GParamSpec instance

### G_PARAM_SPEC_PARAM()

    #define G_PARAM_SPEC_PARAM(pspec)          (G_TYPE_CHECK_INSTANCE_CAST ((pspec), G_TYPE_PARAM_PARAM, GParamSpecParam))

Casts a GParamSpec instance into a GParamSpecParam.

`pspec` :

  a valid GParamSpec instance

### G_VALUE_HOLDS_PARAM()

    #define G_VALUE_HOLDS_PARAM(value)	(G_TYPE_CHECK_VALUE_TYPE ((value), G_TYPE_PARAM))

Return whether the given GValue can hold values derived from type `G_TYPE_PARAM`.

`value` :

  a valid GValue structure

### G_TYPE_PARAM_PARAM

    #define	G_TYPE_PARAM_PARAM		   (g_param_spec_types[15])

The GType of GParamSpecParam.

### GParamSpecParam

    typedef struct {
      GParamSpec    parent_instance;
    } GParamSpecParam;

A GParamSpec derived structure that contains the meta data for `G_TYPE_PARAM` properties.

GParamSpec parent_instance;

  private GParamSpec portion

### g_param_spec_param ()

    GParamSpec*         g_param_spec_param                  (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             GType param_type,
                                                             GParamFlags flags);

Creates a new GParamSpecParam instance specifying a `G_TYPE_PARAM` property.

See `g_param_spec_internal()` for details on property names.

`name` :

  canonical name of the property specified

`nick` :

  nick name for the property specified

`blurb` :

  description of the property specified

`param_type` :

  a GType derived from `G_TYPE_PARAM`

`flags` :

  flags for the property specified

Returns :

  a newly created parameter specification

### g_value_set_param ()

    void                g_value_set_param                   (GValue *value,
                                                             GParamSpec *param);

Set the contents of a `G_TYPE_PARAM` GValue to `param`.

`value` :

  a valid GValue of type `G_TYPE_PARAM`

`param` :

  the GParamSpec to be set

### g_value_take_param ()

    void                g_value_take_param                  (GValue *value,
                                                             GParamSpec *param);

Sets the contents of a `G_TYPE_PARAM` GValue to `param` and takes over the ownership of the callers reference to `param`; the caller doesn't have to unref it any more.

`value` :

  a valid GValue of type `G_TYPE_PARAM`

`param` :

  the GParamSpec to be set

Since 2.4

### g_value_set_param_take_ownership ()

    void                g_value_set_param_take_ownership    (GValue *value,
                                                             GParamSpec *param);

`g_value_set_param_take_ownership` has been deprecated since version 2.4 and should not be used in newly-written code. Use `g_value_take_param()` instead.

This is an internal function introduced mainly for C marshallers.

`value` :

  a valid GValue of type `G_TYPE_PARAM`

`param` :

  the GParamSpec to be set

### g_value_get_param ()

    GParamSpec*         g_value_get_param                   (const GValue *value);

Get the contents of a `G_TYPE_PARAM` GValue.

`value` :

  a valid GValue whose type is derived from `G_TYPE_PARAM`

Returns :

  GParamSpec content of `value`

### g_value_dup_param ()

    GParamSpec*         g_value_dup_param                   (const GValue *value);

Get the contents of a `G_TYPE_PARAM` GValue, increasing its reference count.

`value` :

  a valid GValue whose type is derived from `G_TYPE_PARAM`

Returns :

  GParamSpec content of `value`, should be unreferenced when no longer needed.

### G_IS_PARAM_SPEC_BOXED()

    #define G_IS_PARAM_SPEC_BOXED(pspec)       (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), G_TYPE_PARAM_BOXED))

Return whether the given GParamSpec is of type `G_TYPE_PARAM_BOXED`.

`pspec` :

  a valid GParamSpec instance

### G_PARAM_SPEC_BOXED()

    #define G_PARAM_SPEC_BOXED(pspec)          (G_TYPE_CHECK_INSTANCE_CAST ((pspec), G_TYPE_PARAM_BOXED, GParamSpecBoxed))

Cast a GParamSpec instance into a GParamSpecBoxed.

`pspec` :

  a valid GParamSpec instance

### G_VALUE_HOLDS_BOXED()

    #define G_VALUE_HOLDS_BOXED(value) (G_TYPE_CHECK_VALUE_TYPE ((value), G_TYPE_BOXED))

Return whether the given GValue can hold values derived from type `G_TYPE_BOXED`.

`value` :

  a valid GValue structure

### G_TYPE_PARAM_BOXED

    #define	G_TYPE_PARAM_BOXED		   (g_param_spec_types[16])

The GType of GParamSpecBoxed.

### GParamSpecBoxed

    typedef struct {
      GParamSpec    parent_instance;
    } GParamSpecBoxed;

A GParamSpec derived structure that contains the meta data for boxed properties.

GParamSpec parent_instance;

  private GParamSpec portion

### g_param_spec_boxed ()

    GParamSpec*         g_param_spec_boxed                  (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             GType boxed_type,
                                                             GParamFlags flags);

Creates a new GParamSpecBoxed instance specifying a `G_TYPE_BOXED` derived property.

See `g_param_spec_internal()` for details on property names.

`name` :

  canonical name of the property specified

`nick` :

  nick name for the property specified

`blurb` :

  description of the property specified

`boxed_type` :

  `G_TYPE_BOXED` derived type of this property

`flags` :

  flags for the property specified

Returns :

  a newly created parameter specification

### g_value_set_boxed ()

    void                g_value_set_boxed                   (GValue *value,
                                                             gconstpointer v_boxed);

Set the contents of a `G_TYPE_BOXED` derived GValue to `v_boxed`.

`value` :

  a valid GValue of `G_TYPE_BOXED` derived type

`v_boxed` :

  boxed value to be set

### g_value_set_static_boxed ()

    void                g_value_set_static_boxed            (GValue *value,
                                                             gconstpointer v_boxed);

Set the contents of a `G_TYPE_BOXED` derived GValue to `v_boxed`. The boxed value is assumed to be static, and is thus not duplicated when setting the GValue.

`value` :

  a valid GValue of `G_TYPE_BOXED` derived type

`v_boxed` :

  static boxed value to be set

### g_value_take_boxed ()

    void                g_value_take_boxed                  (GValue *value,
                                                             gconstpointer v_boxed);

Sets the contents of a `G_TYPE_BOXED` derived GValue to `v_boxed` and takes over the ownership of the callers reference to `v_boxed`; the caller doesn't have to unref it any more.

`value` :

  a valid GValue of `G_TYPE_BOXED` derived type

`v_boxed` :

  duplicated unowned boxed value to be set

Since 2.4

### g_value_set_boxed_take_ownership ()

    void                g_value_set_boxed_take_ownership    (GValue *value,
                                                             gconstpointer v_boxed);

`g_value_set_boxed_take_ownership` has been deprecated since version 2.4 and should not be used in newly-written code. Use `g_value_take_boxed()` instead.

This is an internal function introduced mainly for C marshallers.

`value` :

  a valid GValue of `G_TYPE_BOXED` derived type

`v_boxed` :

  duplicated unowned boxed value to be set

### g_value_get_boxed ()

    gpointer            g_value_get_boxed                   (const GValue *value);

Get the contents of a `G_TYPE_BOXED` derived GValue.

`value` :

  a valid GValue of `G_TYPE_BOXED` derived type

Returns :

  boxed contents of `value`

### g_value_dup_boxed ()

    gpointer            g_value_dup_boxed                   (const GValue *value);

Get the contents of a `G_TYPE_BOXED` derived GValue. Upon getting, the boxed value is duplicated and needs to be later freed with `g_boxed_free()`, e.g. like: g_boxed_free (G_VALUE_TYPE (`value`), return_value);

`value` :

  a valid GValue of `G_TYPE_BOXED` derived type

Returns :

  boxed contents of `value`

### G_IS_PARAM_SPEC_POINTER()

    #define G_IS_PARAM_SPEC_POINTER(pspec)     (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), G_TYPE_PARAM_POINTER))

Returns whether the given GParamSpec is of type `G_TYPE_PARAM_POINTER`.

`pspec` :

  a valid GParamSpec instance

### G_PARAM_SPEC_POINTER()

    #define G_PARAM_SPEC_POINTER(pspec)        (G_TYPE_CHECK_INSTANCE_CAST ((pspec), G_TYPE_PARAM_POINTER, GParamSpecPointer))

Casts a GParamSpec instance into a GParamSpecPointer.

`pspec` :

  a valid GParamSpec instance

### G_VALUE_HOLDS_POINTER()

    #define G_VALUE_HOLDS_POINTER(value)	 (G_TYPE_CHECK_VALUE_TYPE ((value), G_TYPE_POINTER))

Return whether the given GValue can hold values of type `G_TYPE_POINTER`.

`value` :

  a valid GValue structure

### G_TYPE_PARAM_POINTER

    #define	G_TYPE_PARAM_POINTER		   (g_param_spec_types[17])

The GType of GParamSpecPointer.

### GParamSpecPointer

    typedef struct {
      GParamSpec    parent_instance;
    } GParamSpecPointer;

A GParamSpec derived structure that contains the meta data for pointer properties.

GParamSpec parent_instance;

  private GParamSpec portion

### g_param_spec_pointer ()

    GParamSpec*         g_param_spec_pointer                (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             GParamFlags flags);

Creates a new GParamSpecPoiner instance specifying a pointer property.

See `g_param_spec_internal()` for details on property names.

`name` :

  canonical name of the property specified

`nick` :

  nick name for the property specified

`blurb` :

  description of the property specified

`flags` :

  flags for the property specified

Returns :

  a newly created parameter specification

### g_value_set_pointer ()

    void                g_value_set_pointer                 (GValue *value,
                                                             gpointer v_pointer);

Set the contents of a pointer GValue to `v_pointer`.

`value` :

  a valid GValue of `G_TYPE_POINTER`

`v_pointer` :

  pointer value to be set

### g_value_get_pointer ()

    gpointer            g_value_get_pointer                 (const GValue *value);

Get the contents of a pointer GValue.

`value` :

  a valid GValue of `G_TYPE_POINTER`

Returns :

  pointer contents of `value`

### G_IS_PARAM_SPEC_OBJECT()

    #define G_IS_PARAM_SPEC_OBJECT(pspec)      (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), G_TYPE_PARAM_OBJECT))

Returns whether the given GParamSpec is of type `G_TYPE_PARAM_OBJECT`.

`pspec` :

  a valid GParamSpec instance

### G_PARAM_SPEC_OBJECT()

    #define G_PARAM_SPEC_OBJECT(pspec)         (G_TYPE_CHECK_INSTANCE_CAST ((pspec), G_TYPE_PARAM_OBJECT, GParamSpecObject))

Casts a GParamSpec instance into a GParamSpecObject.

`pspec` :

  a valid GParamSpec instance

### G_VALUE_HOLDS_OBJECT()

    #define G_VALUE_HOLDS_OBJECT(value) (G_TYPE_CHECK_VALUE_TYPE ((value), G_TYPE_OBJECT))

Return whether the given GValue can hold values derived from type `G_TYPE_OBJECT`.

`value` :

  a valid GValue structure

### G_TYPE_PARAM_OBJECT

    #define	G_TYPE_PARAM_OBJECT		   (g_param_spec_types[19])

The GType of GParamSpecObject.

### GParamSpecObject

    typedef struct {
      GParamSpec    parent_instance;
    } GParamSpecObject;

A GParamSpec derived structure that contains the meta data for object properties.

GParamSpec parent_instance;

  private GParamSpec portion

### g_param_spec_object ()

    GParamSpec*         g_param_spec_object                 (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             GType object_type,
                                                             GParamFlags flags);

Creates a new GParamSpecBoxed instance specifying a `G_TYPE_OBJECT` derived property.

See `g_param_spec_internal()` for details on property names.

`name` :

  canonical name of the property specified

`nick` :

  nick name for the property specified

`blurb` :

  description of the property specified

`object_type` :

  `G_TYPE_OBJECT` derived type of this property

`flags` :

  flags for the property specified

Returns :

  a newly created parameter specification

### g_value_set_object ()

    void                g_value_set_object                  (GValue *value,
                                                             gpointer v_object);

Set the contents of a `G_TYPE_OBJECT` derived GValue to `v_object`.

`value` :

  a valid GValue of `G_TYPE_OBJECT` derived type

`v_object` :

  object value to be set

### g_value_take_object ()

    void                g_value_take_object                 (GValue *value,
                                                             gpointer v_object);

Sets the contents of a `G_TYPE_OBJECT` derived GValue to `v_object` and takes over the ownership of the callers reference to `v_object`; the caller doesn't have to unref it any more.

`value` :

  a valid GValue of `G_TYPE_OBJECT` derived type

`v_object` :

  object value to be set

Since 2.4

### g_value_set_object_take_ownership ()

    void                g_value_set_object_take_ownership   (GValue *value,
                                                             gpointer v_object);

`g_value_set_object_take_ownership` has been deprecated since version 2.4 and should not be used in newly-written code. Use `g_value_take_object()` instead.

This is an internal function introduced mainly for C marshallers.

`value` :

  a valid GValue of `G_TYPE_OBJECT` derived type

`v_object` :

  object value to be set

### g_value_get_object ()

    gpointer            g_value_get_object                  (const GValue *value);

Get the contents of a `G_TYPE_OBJECT` derived GValue.

`value` :

  a valid GValue of `G_TYPE_OBJECT` derived type

Returns :

  object contents of `value`

### g_value_dup_object ()

    GObject*            g_value_dup_object                  (const GValue *value);

Get the contents of a `G_TYPE_OBJECT` derived GValue, increasing its reference count.

`value` :

  a valid GValue whose type is derived from `G_TYPE_OBJECT`

Returns :

  object content of `value`, should be unreferenced when no longer needed.

### G_IS_PARAM_SPEC_UNICHAR()

    #define G_IS_PARAM_SPEC_UNICHAR(pspec)     (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), G_TYPE_PARAM_UNICHAR))

Return whether the given GParamSpec is of type `G_TYPE_PARAM_UNICHAR`.

`pspec` :

  a valid GParamSpec instance

### G_PARAM_SPEC_UNICHAR()

    #define G_PARAM_SPEC_UNICHAR(pspec)        (G_TYPE_CHECK_INSTANCE_CAST ((pspec), G_TYPE_PARAM_UNICHAR, GParamSpecUnichar))

Cast a GParamSpec instance into a GParamSpecUnichar.

`pspec` :

  a valid GParamSpec instance

### G_TYPE_PARAM_UNICHAR

    #define	G_TYPE_PARAM_UNICHAR		   (g_param_spec_types[9])

The GType of GParamSpecUnichar.

### GParamSpecUnichar

    typedef struct {
      GParamSpec    parent_instance;

      gunichar      default_value;
    } GParamSpecUnichar;

A GParamSpec derived structure that contains the meta data for unichar (unsigned integer) properties.

GParamSpec parent_instance;

  private GParamSpec portion

gunichar default_value;

  default value for the property specified

### g_param_spec_unichar ()

    GParamSpec*         g_param_spec_unichar                (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             gunichar default_value,
                                                             GParamFlags flags);

Creates a new GParamSpecUnichar instance specifying a `G_TYPE_UINT` property. GValue structures for this property can be accessed with `g_value_set_uint()` and `g_value_get_uint()`.

See `g_param_spec_internal()` for details on property names.

`name` :

  canonical name of the property specified

`nick` :

  nick name for the property specified

`blurb` :

  description of the property specified

`default_value` :

  default value for the property specified

`flags` :

  flags for the property specified

Returns :

  a newly created parameter specification

### G_IS_PARAM_SPEC_VALUE_ARRAY()

    #define G_IS_PARAM_SPEC_VALUE_ARRAY(pspec) (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), G_TYPE_PARAM_VALUE_ARRAY))

Return whether the given GParamSpec is of type `G_TYPE_PARAM_VALUE_ARRAY`.

`pspec` :

  a valid GParamSpec instance

### G_PARAM_SPEC_VALUE_ARRAY()

    #define G_PARAM_SPEC_VALUE_ARRAY(pspec)    (G_TYPE_CHECK_INSTANCE_CAST ((pspec), G_TYPE_PARAM_VALUE_ARRAY, GParamSpecValueArray))

Cast a GParamSpec instance into a GParamSpecValueArray.

`pspec` :

  a valid GParamSpec instance

### G_TYPE_PARAM_VALUE_ARRAY

    #define	G_TYPE_PARAM_VALUE_ARRAY	   (g_param_spec_types[18])

The GType of GParamSpecValueArray.

### GParamSpecValueArray

    typedef struct {
      GParamSpec    parent_instance;
      GParamSpec   *element_spec;
      guint		fixed_n_elements;
    } GParamSpecValueArray;

A GParamSpec derived structure that contains the meta data for GValueArray properties.

GParamSpec parent_instance;

  private GParamSpec portion

GParamSpec *element_spec;

  a GParamSpec describing the elements contained in arrays of this property, may be `NULL`

guint fixed_n_elements;

  if greater than 0, arrays of this property will always have this many elements

### g_param_spec_value_array ()

    GParamSpec*         g_param_spec_value_array            (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             GParamSpec *element_spec,
                                                             GParamFlags flags);

Creates a new GParamSpecValueArray instance specifying a `G_TYPE_VALUE_ARRAY` property. `G_TYPE_VALUE_ARRAY` is a `G_TYPE_BOXED` type, as such, GValue structures for this property can be accessed with `g_value_set_boxed()` and `g_value_get_boxed()`.

See `g_param_spec_internal()` for details on property names.

`name` :

  canonical name of the property specified

`nick` :

  nick name for the property specified

`blurb` :

  description of the property specified

`element_spec` :

  a GParamSpec describing the elements contained in arrays of this property, may be `NULL`

`flags` :

  flags for the property specified

Returns :

  a newly created parameter specification

### G_IS_PARAM_SPEC_OVERRIDE()

    #define G_IS_PARAM_SPEC_OVERRIDE(pspec)    (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), G_TYPE_PARAM_OVERRIDE))

Returns whether the given GParamSpec is of type `G_TYPE_PARAM_OVERRIDE`.

`pspec` :

  a GParamSpec

Since 2.4

### G_PARAM_SPEC_OVERRIDE()

    #define G_PARAM_SPEC_OVERRIDE(pspec)       (G_TYPE_CHECK_INSTANCE_CAST ((pspec), G_TYPE_PARAM_OVERRIDE, GParamSpecOverride))

Casts a GParamSpec into a GParamSpecOverride.

`pspec` :

  a GParamSpec

Since 2.4

### G_TYPE_PARAM_OVERRIDE

    #define	G_TYPE_PARAM_OVERRIDE		   (g_param_spec_types[20])

The GType of GParamSpecOverride.

Since 2.4

### GParamSpecOverride

    typedef struct {
    } GParamSpecOverride;

This is a type of GParamSpec type that simply redirects operations to another paramspec. All operations other than getting or setting the value are redirected, including accessing the nick and blurb, validating a value, and so forth. See `g_param_spec_get_redirect_target()` for retrieving the overidden property. GParamSpecOverride is used in implementing `g_object_class_override_property()`, and will not be directly useful unless you are implementing a new base type similar to GObject.

Since 2.4

### g_param_spec_override ()

    GParamSpec*         g_param_spec_override               (const gchar *name,
                                                             GParamSpec *overridden);

Creates a new property of type GParamSpecOverride. This is used to direct operations to another paramspec, and will not be directly useful unless you are implementing a new base type similar to GObject.

`name` :

  the name of the property.

`overridden` :

  The property that is being overridden

Returns :

  the newly created GParamSpec

Since 2.4

### G_IS_PARAM_SPEC_GTYPE()

    #define G_IS_PARAM_SPEC_GTYPE(pspec)       (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), G_TYPE_PARAM_GTYPE))

Returns whether the given GParamSpec is of type `G_TYPE_PARAM_GTYPE`.

`pspec` :

  a GParamSpec

Since 2.10

### G_PARAM_SPEC_GTYPE()

    #define G_PARAM_SPEC_GTYPE(pspec)          (G_TYPE_CHECK_INSTANCE_CAST ((pspec), G_TYPE_PARAM_GTYPE, GParamSpecGType))

Casts a GParamSpec into a GParamSpecGType.

`pspec` :

  a GParamSpec

Since 2.10

### G_VALUE_HOLDS_GTYPE()

    #define G_VALUE_HOLDS_GTYPE(value)	 (G_TYPE_CHECK_VALUE_TYPE ((value), G_TYPE_GTYPE))

Returns whether the given GValue can hold values of type `G_TYPE_GTYPE`.

`value` :

  a valid GValue structure

Since 2.12

### G_TYPE_PARAM_GTYPE

    #define	G_TYPE_PARAM_GTYPE		   (g_param_spec_types[21])

The GType of GParamSpecGType.

Since 2.10

### GParamSpecGType

    typedef struct {
      GParamSpec    parent_instance;
      GType         is_a_type;
    } GParamSpecGType;

A GParamSpec derived structure that contains the meta data for GType properties.

GParamSpec parent_instance;

  private GParamSpec portion

GType is_a_type;

  a GType whose subtypes can occur as values

Since 2.10

### g_param_spec_gtype ()

    GParamSpec*         g_param_spec_gtype                  (const gchar *name,
                                                             const gchar *nick,
                                                             const gchar *blurb,
                                                             GType is_a_type,
                                                             GParamFlags flags);

Creates a new GParamSpecGType instance specifying a `G_TYPE_GTYPE` property.

See `g_param_spec_internal()` for details on property names.

`name` :

  canonical name of the property specified

`nick` :

  nick name for the property specified

`blurb` :

  description of the property specified

`is_a_type` :

  a GType whose subtypes are allowed as values of the property (use `G_TYPE_NONE` for any type)

`flags` :

  flags for the property specified

Returns :

  a newly created parameter specification

Since 2.10

### g_value_get_gtype ()

    GType               g_value_get_gtype                   (const GValue *value);

Get the contents of a `G_TYPE_GTYPE` GValue.

`value` :

  a valid GValue of type `G_TYPE_GTYPE`

Returns :

  the GType stored in `value`

Since 2.12

### g_value_set_gtype ()

    void                g_value_set_gtype                   (GValue *value,
                                                             GType v_gtype);

Set the contents of a `G_TYPE_GTYPE` GValue to `v_gtype`.

`value` :

  a valid GValue of type `G_TYPE_GTYPE`

`v_gtype` :

  GType to be set

Since 2.12

## See Also

GParamSpec, GValue, `g_object_class_install_property()`.