For an unqualified name, that is a name that does not appear to the right of a scope resolution operator ::, name lookup examines the

This header is part of the numeric library.

Defined in header <math.h>

size_type size() const;

Defined in header

Defined in header <ctype.h>

A FunctionObject type is the type of an object that can be used on the left of the function call operator.

void pop_front();

Queries the number of elements in a parameter pack

char_type widen( char c ) const;