c++ std map initializer list
#include <iostream>
#include <map>
int main() {
std::map<int, std::string> myMap = {
{1, "one"},
{2, "two"},
{3, "three"}
};
for (const auto& pair : myMap) {
std::cout << pair.first << ": " << pair.second << std::endl;
}
return 0;
}