__VA_ARGS__使用

#include <stdio.h>
#include <iostream>
#define LOG_TYPE0(format, ...) do { \
    printf(format, __VA_ARGS__);    \
} while (0)                         \

#define LOG_TYPE1(format, args...) do { \
    printf(format, args);               \
} while (0)                             \

#define LOG_TYPE2(format, ...) do { \
    printf(format, ##__VA_ARGS__);  \
} while (0)                         \

#define LOG_TYPE3(format, args...) do { \
    printf(format, ##args);             \
} while (0)                             \

#define LOG(x) printf("LOG "#x" %d\n", x);
int main() {
    LOG_TYPE0("hello %d \n", 0);
    LOG_TYPE1("hello %d \n", 1);
    LOG_TYPE2("hello %d \n", 2);
    LOG_TYPE3("hello %d \n", 3);
    LOG(10);

    return 0;
}