That is an operator overload of a library and not built in language syntax. Even so there is now std::format https://en.cppreference.com/w/cpp/utility/format/

That is an operator overload of a library and not built in language syntax. Even so there is now std::format https://en.cppreference.com/w/cpp/utility/format/format https://en.cppreference.com/w/cpp/utility/format/format