lst-0033-book.cpp
// https://godbolt.org/z/chTTqPjrM
#include <string>
#include <iostream>
int main() {
std::cout << "string_literals\n";
// using std::literals::string_literals::operator""s;
// using namespace std::string_literals;
// using namespace std::literals::string_literals;
using namespace std::literals;
std::cout << "Real string\n "s;
}