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Question About Headers!

Started by dre_gon Nov 17, 2001 at 4:52 AM 5 replies 200+ views

Original Post

Nov 17, 2001 at 4:52 AM

Hi,i was just wondering why do people define name of the header file in the header file? For example. ZeldaBase.h #ifndef _ZELDABASE_H_ #define _ZELDABASE_H_ #endif

siaspete

Nov 17, 2001 at 4:59 AM

It''s to stop it being included twice. The compiler can give errors if it finds two types with the same name.

dre_gon

Author

dre_gon

Nov 17, 2001 at 5:16 AM

Thank''s it''s sort of answers the question. But i still wonder why not say.

#define ZELDABASE.H not
#define _ZELDABASE_H_ what underscope stands for?

feagle814

Nov 17, 2001 at 1:00 PM

I think they use underscores because some compilers may be picky about the names of #defined identifiers. The leading underscores may ensure that the name doesn''t clash with some other #definition that actually has a bearing on the program.

dre_gon

Author

dre_gon

Nov 17, 2001 at 2:53 PM

Thanks a lot fellows.

jwace81

Nov 17, 2001 at 4:31 PM

They don''t define it like this:
#define ZELDABASE.H
Because the ''.'' is an operator, and so cannot be used in the name. However, you should be able to do this:
#define ZELDABASE_H and it should work just fine, since ''_'' can be used in a name.

J.W.

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