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


NAME
     not_equal_to

      - A 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(),<br>
     vec2.begin(),<br>                         vecResult.begin(),
     not_equal_to<int>());

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



INTERFACE
     template <class T>
     struct not_equal_to : binary_function<T, T, bool> {
      bool operator() (const T&, const T&) const;
     };


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

     vector<int, allocator<int> >

     instead of:

     vector<int>

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



SEE ALSO
     binary_function,_Function_Objects

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