println function for C++>=17

println.cpp

/*
a print function with line break for standard output.
usage: println(args...)
args are variadic arguments to display.

It behaves in the same way as the following standard output format;
std::cout << args[0] << args[1] << ... << std::endl;

This fuction needs C++17.
*/

#include <iostream>
#include <string>

template<typename... Args>
void print_all(std::ostream& os, Args... args)
{
  (os << ... << args);
}

template<typename... Args>
void println(Args... args)
{
  print_all(std::cout, args...);
  std::cout << std::endl;
}



// example
int main() {
    int x = 42;
    double y = 3.14;
    std::string text = "Hello, World!";

    println(text);
    println("x= ", x, " y= ", y);

    return 0;
}