Standard C++ LibraryCopyright 1996, Rogue Wave Software, Inc.

NAME

  not_equal_to  - Binary function object that returns true if its first
  argument is not equal to its second.

SYNOPSIS

  #include <functional>

  template <class T>
  struct not_equal_to : public binary_function<T, T, bool> ;

DESCRIPTION

  not_equal_to is a binary function object.  Its operator() returns true if x
  is not equal to y.  You can pass a not_equal_to object to any algorithm
  that requires a binary function.  For example, the transform algorithm
  applies a binary operation to corresponding values in two collections and
  stores the result.  not_equal_to would be used in that algorithm in the
  following manner:

  vector<int> vec1;
  vector<int> vec2;
  vector<int> vecResult;
  transform(vec1.begin(), vec1.end(),
            vec2.begin(),
            vecResult.begin(), not_equal_to<int>());

  After this call to transform, vecResult(n) will contain a "1" if vec1(n)
  was not equal to  vec2(n) or a "1" if vec1(n) was equal to vec2(n).

INTERFACE

  template <class T>
  struct not_equal_to : binary_function<T, T, bool> {
   typedef typename binary_function<T, T, bool>::second_argument_type
                                                 second_argument_type;
   typedef typename binary_function<T, T, bool>::first_argument_type
                                                 first_argument_type;
   typedef typename binary_function<T, T, bool>::result_type
                                                 result_type;
   bool operator() (const T&, const T&) const;
  };

WARNING

  If your compiler does not support default template parameters, then you
  need to always supply the Allocator template argument.  For instance, you
  will need to write :

  vector<int, allocator<int> >

  instead of :

  vector<int>

SEE ALSO

  binary_function, function object

STANDARDS CONFORMANCE

  ANSI X3J16/ISO WG21 Joint C++ Committee



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