关于 C++ 14 和 C++ 17

void print_map(std::string_view comment, const std::map<std::string, int>& m)
{
    std::cout << comment;
    // Iterate using C++17 facilities
    for (const auto& [key, value] : m)
        std::cout << '[' << key << "] = " << value << "; ";
    std::cout << '\n';
}