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tenpoku1000/global.cpp

Last active June 9, 2016 07:11
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C++ でグローバル定数を宣言する場合のイディオム。定数の唯一の定義をマクロ HEADER_H_ で指示することで実現する
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global.cpp
(1) Header.h
#if defined(HEADER_H_)
extern const int global = 100;
#else
extern const int global;
#endif
(2) consumer.cpp
#include "Header.h"
(3) main.cpp
#define HEADER_H_
#include "Header.h"
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