This header was originally in the C standard library as <locale.h>. This header is part of the

Defined in header

This header is part of the compile-time rational

Defined in header

Defined in header

Usage alignof

size_type count( const Key& key ) const; (1)

Defined in header

Introduces implementation-defined attributes for types, objects, code, etc. [[ attr]]

template< class CharT, class Traits, class ResultType > std::basic_ostream<CharT