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

NAME

  plus  - A binary function object that returns the result of adding its
  first and second arguments.

SYNOPSIS

  #include <functional>

    template<class T>
    struct plus : public binary_function<T, T, T> ;

DESCRIPTION

  plus is a binary function object.  Its operator() returns the result of
  adding x and y.  You can pass a plus object to any algorithm that uses a
  binary function.  For example, the transform algorithm applies a binary
  operation to corresponding values in two collections and stores the result.
  plus 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(), plus<int>());

  After this call to transform, vecResult(n) will contain vec1(n) plus
  vec2(n).

INTERFACE

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

WARNING

  If your compiler does not support default template parameters, 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 objects

STANDARDS CONFORMANCE

  ANSI X3J16/ISO WG21 Joint C++ Committee



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