not1()

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A function adaptor used to reverse the sense of a unary predicate function object

#include <functional>

namespace std {
  template<class Predicate>
  unary_negate <Predicate> not1(const Predicate&);
}

not1() is a function adaptor, known as a negator, that takes a unary predicate function object as its argument and returns a unary predicate function object that is the complement of the original. unary_negate is the function object class used for a return type for the not1() negator.

Note that not1() works only with function objects that are defined as subclasses of the class unary_function.

Negators, not2(), unary_function, unary_negate, pointer_to_unary_function

ISO/IEC 14882:1998 -- International Standard for Information Systems -- Programming Language C++, Section 20.3.5