#include <iostream>
#include <string_view>
// 采用宏展开的方式 ,定义一个日志宏
#define LOG(message) log(message, __FILE__, __LINE__)
void log(std::string_view message, std::string_view filename, int line)
{
std::cout << "info:" << filename << ":" << line << " " << message << std::endl;
}
int main()
{
LOG("Hello world!");
return 0;
}