Subj : *.cpp & *.h interaction & structure
To   : borland.public.cpp.borlandcpp
From : Alistair
Date : Tue Jul 13 2004 11:26 pm

When creating a normal C++ project without anything special to compilers
(nothing borland / ms specific),
the creation of main.cpp and main.h and , for example, xxx.cpp and xxx.h,
yyy.cpp and yyy.h

If i wanted to define a variable that can be accessed from each of these
..cpp files and that variable
would referencing the same memory space (the same data in that space), then
how would I go about it?

I have looked at static variables and can see that they are useful if
declared and used within the same function
but If I am no working with classes or funtion specific variables that are
stored in the static memory arena, then
how would I create a free standing globally accessable variable?  declaring
a free standing static variable doesnt
work, especially if that variable is a pointer to memory assigned within one
function.

static void *myvar;

// in XXX.cpp
function somefunc()
{
    myvar = malloc(sizeof(long) * 60);
}

// in YYY.cpp
function someYFunc()
{
    void * ptrdata = myvar;  //myvar = null
}

I dont really want to create a class or anything else like that (dramatic),
is it possible to define a global variable
and have all .cpp within a program view and use the global variable (which
is free standing, i.e. not a part of a class etc...)

Thanks for any help on this.

Cheers

Alistair

.