Help! Redefinition Error

I have two classes in my project, both of which use the same header file which contains this struct definition:

struct vertex3D {
float X;
float Y;
float Z;
};

When I try to compile the project I get a 'struct' type redefinition error.
How can I include the above header in both classes without getting this error?

Use #ifndef/#define/#endif for header guarding. Search the forums...

like this:

Code:

---

#ifndef 3DVERTEX
#define 3DVERTEX 1
struct vertex3D {
        float X;
        float Y;
        float Z;
};

/* all the rest of the required stuff here..... */
#endif

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It only will be included once this way.

You can use the '#pragma once' preprocessor directive. Put it at the top of your header files. It tells the compiler to only include the header file once.

I really should learn to use those preprocessor macros...

Quote:

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Originally posted by atjs
You can use the '#pragma once' preprocessor directive. Put it at the top of your header files. It tells the compiler to only include the header file once.

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That's only for MSVC.

Quote:

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Originally posted by parksie
That's only for MSVC.

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Which is ok if the headers are guaranteed to be only used by MSVC (like headers of MFC apps), but not if the headers contain general utility functions/classes.