Man Page plus.3

                       Standard C++ Library
             Copyright 1998, Rogue Wave Software, Inc.



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


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


     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 follow-
     ing 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) contains  vec1(n)
     plus vec2(n).


     template<class T>
     struct plus : binary_function<T, T, T> {
      T operator() (const T&, const T&) const;


     If your compiler does not support default  template  parame-
     ters, you always need to supply the Allocator template argu-
     ment. For instance, you need to write:

     vector<int, allocator<int> >

     instead of:


     If your compiler does not support namespaces,  then  you  do
     not need the using declaration for std.


     binary_function, Function_Objects