unary_negate

Library:  General utilities

unary_negate  unary_function

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Members

operator()()

unary_negate()

A function object that returns the complement of the result of its unary predicate

#include <functional>

namespace std {
  template <class Predicate>
  class unary_negate;
}

unary_negate is a function object used as a return type for the function adapter not1(). not1() is a function adapter, 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.

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

namespace std {

  template <class Predicate>
  class unary_negate : public
     unary_function<typename Predicate::argument_type, bool> {

   public:
   explicit unary_negate(const Predicate&);
   bool operator()(const typename
                    Predicate::argument_type&) const;
  };
}

explicit 
unary_negate(const Predicate& pred);

Constructs a unary_negate object from predicate pred.

bool 
operator()(const typename Predicate::argument_type& x)
           const;

Returns the result of unary_negate<predicate>(pred).

not1(), not2(), unary_function, binary_negate

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