Though user-defined literals are available from C++11, standard literal operators have been available only from C++14. The following is a list of these standard literal operators:

• operator""s for defining std::basic_string literals:

        using namespace std::string_literals; 

        auto s1{  "text"s }; // std::string 
        auto s2{ L"text"s }; // std::wstring 
        auto s3{ u"text"s }; // std::u16string 
        auto s4{ U"text"s }; // std::u32string

• operator""h, operator""min, operator""s, operator""ms, operator""us, and operator""ns for creating a std::chrono::duration value:

        using namespace std::literals::chrono_literals; 

        // std::chrono::duration<long long> 
        auto timer {2h + 42min + 15s};

• operator""if, operator""i, and operator""il for creating a std::complex value:

        using namespace std::literals::complex_literals; 

        auto c{ 12.0 + 4.5i }; // std::complex<double>