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

NAME

  equal_to  - Binary function object that returns true if its first argument
  equals its second

SYNOPSIS

  #include <functional>

  template <class T>
  struct equal_to;

DESCRIPTION

  equal_to is a binary function object.  Its operator() returns true if x is
  equal to y.  You can pass an 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.
  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(),
            equal_to<int>());

  After this call to transform, vecResult(n) will contain a "1" if vec1(n)
  was equal to  vec2(n) or a "0" if vec1(n) was not equal to vec2(n).

INTERFACE

  template <class T>
     struct 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;

SEE ALSO

    bool operator() (const T&, const T&) const;
  }; binary_function, function objects

STANDARDS CONFORMANCE

  ANSI X3J16/ISO WG21 Joint C++ Committee



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