contains another string  Example: std::string haystack{ "Hello World!" }; std::println("{}", haystack.contains("World")); // true std::println("{}", haystack.contains('!')); // true using namespace namespace std::string_view_literals; std::println("{}", haystack.contains("Hello"sv)); // true54 Agenda  C++23 Core Language  Explicit Object Parameters  if consteval  Multidimensional Subscript