HP C++ User Documentation

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

NAME

  minus  - Returns the result of subtracting its second argument from its
  first.

SYNOPSIS

  #include<functional>

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

DESCRIPTION

  minus is a binary function object.  Its operator() returns the result of x
  minus y.  You can pass a minus 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.
  minus 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(), minus<int>());

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

INTERFACE

  template <class T>
  struct minus : 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, then you
  need to always supply the Allocator template argument.  For instance, you
  will have 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