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header-guard

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Header guard

Header guards are a pattern used in C and C++ programming languages when writing header files. Header files are files that

A prototypical example of a header guard is the following 

// hello_world.h
#ifndef __HELLO_WORLD_H__
#define __HELLO_WORLD_H__
 
struct Hello {
    const char *world;
};
 
#endif /* __HELLO_WORLD_H__ */
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