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#include file trouble
Author
I have a problem where lots of files in my project need to include a specific class. However some of these files have functions which have a pointer to that class as a parameter. Now, because of this, I need to put the #include "classname.h" command inside the header file of that file instead of its .cpp file. However due to this I get "redifinition of classname" errors.
Is there a way around this?
Do this in your header files :
#ifndef __SOMETEXT__
#define __SOMETEXT__
class CMyClass
{
....
};
#endif
You can replace __SOMETEXT__ with whatever you want, just make sure its different for each header file. This will prevent classes from being defined multiple times.
Nate
http://nate.scuzzy.net
#ifndef __SOMETEXT__
#define __SOMETEXT__
class CMyClass
{
....
};
#endif
You can replace __SOMETEXT__ with whatever you want, just make sure its different for each header file. This will prevent classes from being defined multiple times.
Nate
http://nate.scuzzy.net
you don''t need to include the definition of a class just to declare something that uses a pointer to that class. you can just forward declare the class by doing:
class CFoo;
if you have CBar in Bar.h which has a funcion that takes a CFoo, do this:
#ifndef _BAR_H_
#define _BAR_H_
class CFoo;
class CBar
{
public :
void Init(CFoo* pFoo);
};
#endif
class CFoo;
if you have CBar in Bar.h which has a funcion that takes a CFoo, do this:
#ifndef _BAR_H_
#define _BAR_H_
class CFoo;
class CBar
{
public :
void Init(CFoo* pFoo);
};
#endif
Author
thanks for all your help.. Its funny, cause I''m at uni learning this stuff, but they only cover the real basics, and stuff like this that I imagine would be quite common they dont even mention.. ah well. Thanks again
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