Created
September 22, 2017 09:28
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C++宏默认参数
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enum | |
{ | |
plain = 0, | |
bold = 1, | |
italic = 2 | |
}; | |
void PrintString(const char* message, int size, int style) | |
{ | |
} | |
#define PRINT_STRING_1_ARGS(message) PrintString(message, 0, 0) | |
#define PRINT_STRING_2_ARGS(message, size) PrintString(message, size, 0) | |
#define PRINT_STRING_3_ARGS(message, size, style) PrintString(message, size, style) | |
#define GET_4TH_ARG(arg1, arg2, arg3, arg4, ...) arg4 | |
#define PRINT_STRING_MACRO_CHOOSER(...) \ | |
GET_4TH_ARG(__VA_ARGS__, PRINT_STRING_3_ARGS, \ | |
PRINT_STRING_2_ARGS, PRINT_STRING_1_ARGS, ) | |
#define PRINT_STRING(...) PRINT_STRING_MACRO_CHOOSER(__VA_ARGS__)(__VA_ARGS__) | |
int main(int argc, char * const argv[]) | |
{ | |
PRINT_STRING("Hello, World!"); | |
PRINT_STRING("Hello, World!", 18); | |
PRINT_STRING("Hello, World!", 18, bold); | |
return 0; | |
} |
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