header cppreference.com 0 /0 0 Create account Log in /0 0 Namespaces Page Discussion /0 1 Variants /1 0 Views View Edit History /0 1 Actions /1 /header content firstHeading C++ attribute: (since C++20) /firstHeading bodyContent tagline From cppreference.com /tagline subtitle < cpp ‎ | language ‎ | attributes /subtitle bodycontent C++ Compiler support Freestanding and hosted Language Standard library Standard library headers Named requirements Feature test macros (C++20) Language support library Concepts library (C++20) Metaprogramming library (C++11) Diagnostics library General utilities library Strings library Containers library Iterators library Ranges library (C++20) Algorithms library Numerics library Localizations library Input/outp...