not2()

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

#include <functional>

namespace std {
  template <class Predicate>
  binary_negate<Predicate> not2(const Predicate& pred);
}

not2() is a function adaptor, known as a negator, that takes a binary predicate function object as its argument and returns a binary predicate function object that is the complement of the original. binary_negate is the function object class used as a return type for the not2() negator.

Note that not2() works only with function objects that are defined as subclasses of the class binary_function.

binary_function, binary_negate, Negators, not1(), pointer_to_binary_function, unary_negate

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