#pragma GCC system_header #include inline namespace my_string_literals { std::string operator"" s(const char* str, std::size_t len) { return std::string{str, len}; } std::wstring operator"" s(const wchar_t* str, std::size_t len) { return std::wstring{str, len}; } std::u16string operator"" s(const char16_t* str, std::size_t len) { return std::u16string{str, len}; } std::u32string operator"" s(const char32_t* str, std::size_t len) { return std::u32string{str, len}; } }