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CIncludeGuard

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(C) #include guard

This  ?preprocessor statements #ifndef , ?#define and #endif can be used for #include guards. These prevent a header file (.h) to be #included multiple times, causing a redeclaration error.

An #include guard

ifndef __MYHEADERFILE_H

define __MYHEADERFILE_H


//Your header (.h) file
endif

An implementation file (.c) does not have #include guards, because they do not get #included, but 'Added to Project' instead.

Always write internal #include guards. Never write external #include guards.

'#include guard' links

• C++

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