如何制作可变参数宏

#include<iostream>

// 基本宏定义
#define PRINT_ARGS_1(arg1) std::cout<< arg1<< std::endl;
#define PRINT_ARGS_2(arg1, arg2) std::cout<< arg1 << ", "<< arg2<< std::endl;
#define PRINT_ARGS_3(arg1, arg2, arg3) std::cout<< arg1 << ", "<< arg2 << ", "<< arg3<< std::endl;

// 可变参数宏定义
#define VA_NUM_ARGS_IMPL(_1, _2, _3, N, ...) N
#define VA_NUM_ARGS(...) VA_NUM_ARGS_IMPL(__VA_ARGS__, 3, 2, 1)

#define VA_MACRO_DISPATCHER(macro, ...) VA_MACRO_DISPATCHER_IMPL(macro, VA_NUM_ARGS(__VA_ARGS__))
#define VA_MACRO_DISPATCHER_IMPL(macro, nargs) macro ## nargs

#define PRINT_ARGS(...) VA_MACRO_DISPATCHER(PRINT_ARGS, __VA_ARGS__)(__VA_ARGS__)

int main() {
    PRINT_ARGS(1);
    PRINT_ARGS(1, 2);
    PRINT_ARGS(1, 2, 3);
    return 0;
}

1
1, 2
1, 2, 3