Macro Name In Calss Definition

[rupeshh]

hi

In a project I saw following line of code :

class PDS_COREDLL_API cMatrix

viewing the definition of the PDS_COREDLL_API

I was directed to a file having these lines of code

// Library DLLs
#define PDS_COREDLL_API


Could anyone gentleman let me know the significance?


Rupesh

[weaknessforcats]

I have no idead what this is. PDS_COREDLL_API is defined as nothing so the result is:

class cMatrix
etc...
 

I suspect that if it were defined as something your code would not compile.

Now I have see this sort of thing when it comes to functions. You can place a qualifer in that position (between the function name and the return type) that specifies the calling convention.

[rupeshh]

This is another instance of similar code


I found

claass PDS_EXPORT someClass
{
...

}


and the definition of PDS_EXPORT led me to


#define PDS_EXPORT
#ifdef __MFC_AFX__
//#include "stdafx.h"
#include <afxwin.h> // this file exists and is a MFC file
#endif
#endif

TIA

Rupesh

[Savage]

This is another instance of similar code


I found

claass PDS_EXPORT someClass
{
...

}


and the definition of PDS_EXPORT led me to


#define PDS_EXPORT
#ifdef __MFC_AFX__
//#include "stdafx.h"
#include <afxwin.h> // this file exists and is a MFC file
#endif
#endif

TIA

Rupesh

Is there another macro above PDS_EXPORT,perhaps #ifndef?

If not then it's the same thing as with previous macro in class name.

[rupeshh]

Thanks for reply,

Yes it has some # ifdefs and # ifndef
statements.



#define SOME_DILL
#define SOME_EXPORT

THEN IS A series of STATEMENTS LIKE

# ifdef and #ifndef CONTAINING __declspec( dllimport )


AND then

#ifndef __CROSSPLATFORM__
#define SOMETHING_EXPORT
#ifdef __MFC_AFX__
#include <afxwin.h>
#endif
#endif




i HOPE THIS GIVES you some idea of the things happening with the code

Thanks

Rupesh

[weaknessforcats]

Nowhere is PDS_EXPORT defined as anything other than a symbol.

That makes class PDS_EXPORT someClass just class someClass.

I don't see that the symbol is ever tested with an #ifdef or #ifndef.

Take it out and see what happens. My guess is nothing.