C++ Macro Note

Last Update: 2013/05/11 21:33+08
Type: Note

Intro

C++ Macro 筆記

#define GetObjName(x) #x
#define DebugPrint(msg) printf("%s ; %s ; %s ; %d\n", #msg, __FILE__, __FUNCTION__, __LINE__)
#define Contact(x, y) x##y


int _tmain(int argc, _TCHAR* argv[])
{

 printf("line: %d \n", __LINE__);
 printf("file: %s \n", __FILE__);
 printf("function: %s \n", __FUNCTION__);
 //printf("function: %s \n", __func__);
 printf("time: %s \n", __TIME__);
 printf("date: %s \n", __DATE__);
 //printf("STDC: %d \n", __STDC__);
 //printf("STDC_HOSTED: %d \n", __STDC_HOSTED__);
 //printf("VERSION: %s \n", __VERSION__);
 printf("TIMESTAMP: %s \n", __TIMESTAMP__);


 char* s = GetObjName(MyClass);
 printf("%s \n", s);
 Contact(pri, ntf) ("exec printf \n");
 DebugPrint("Debug");


 getchar();
 return 0;
}

Macro中的# 代表取得variable名稱
該變數可以是 class, function, ...

## 是將2個變數粘在一起, pri##ntf = printf

__FILE__ , __FUNCTION__, __LINE__, ... 是 Compiler 預先就定義好的變數
debug時, 可以print出來, 方便識別