Man Page less.3

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

NAME

     less

      - A binary function object that returns true if  its  first
     argument is less than its second.

SYNOPSIS

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

DESCRIPTION

     less is a binary function  object.  Its  operator()  returns
     true  if x is less than y. You can pass a less 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  of  the function.   less would be used in that algo-
     rithm in the following manner:


     vector<int> vec1;
     vector<int> vec2;
     vector<int> vecResult;
     transform(vec1.begin(), vec1.end(),
              vec2.begin(),
              vecResult.begin(), less<int>());

     After this call to transform, vecResult(n) contains a  1  if
     vec1(n)  was less than vec2(n) or a 0 if vec1(n) was greater
     than or equal to vec2(n).

INTERFACE

     template <class T>
     struct less : 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 have 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