Subj : Q&A: Class problems
To   : borland.public.cpp.borlandcpp
From : Mark Manning/Muniz Eng.
Date : Sat Sep 11 2004 09:49 pm

I recently got the Borland C++v5.02 compiler et al.  I've done work with 
C++ for years but the compiler is frustrating me.

I am making a simple "create a name" program for our D&D game and I've 
made a class called "Name".  It looks like this:

/////////////////////////////////////////////////////////////////
enum { gUC, gLC };		//	Upper and lowercase ENUMs
enum { gMale, gFemale );	//	Character's gender

class Name
{
private:
<my variables>

public:
	Name( void );
	~Name( void );

	full( void );		//	Return the full name.
	human( long optA );	//	Create a human name.
	elf( long optA );	//	Create an elven name.
};
////////////////////////////////////////////////////////////////

The main program looks like this:

////////////////////////////////////////////////////////////////
#include "main.h"

void
main( int argc, char *argv[] )
{
	Name	myName;

	printf( "gUC = %d\n", gUC );
	myName.human( gMale );
	printf( "My name is: %s\n", myName.full() );
	exit( 0 );
}
////////////////////////////////////////////////////////////////

All of the functions are properly set in name.cpp.  Like so:

////////////////////////////////////////////////////////////////
#include "main.h"

Name::Name( void )
{
	<Code to init the names>
}

Name::~Name( void )
{
}

Name::full( void )
{
	return( m_full );
}

Name::human( long optA )
{
	<Code to create a human name>
}

Name::elf( long optA )
{
	<Code to create an elven name>
}
///////////////////////////////////////////////////////////////////

The "main.h" file contains all of the includes to the various classes.

///////////////////////////////////////////////////////////////////
#include	<stdio.h>
#include	<stdlib.h>
..
..
..
#include	"name.h"
///////////////////////////////////////////////////////////////////

Ok!  Now that you have all of that information - here is the question:

When I compile - it likes everything.  But when it reaches the linker 
stage I get:

Undefined Name::~Name()
Undefined Name::human( long optA )
Undefined Name::full()

I've checked all of the functions.  I've tried commenting out each of 
the above one after the other - no other error messages are coming out 
of the linker.  Also, the first printf statement does not give an error 
about gUC.  So I know it is getting name.h loaded.

Why would the linker not like the functions themselves?  Also, under gcc 
this compiles without a problem (linux) but Borland C++ v5.02 dies.  My 
next plan of attack is to delete and redo the project's file.  Maybe 
that is the answer.  I recently decided to move everything to a separate 
subfolder (called Character).  So maybe the project file is messed up 
somehow.  Unknown but if you have an idea I'd like to hear from you. 
(markem@ev1.net).

TIA to anyone who has an idea on this problem.  :-)

Mark

.