examples/manual/lex_compare.cpp

/**************************************************************************
 *
 * lex_comp.cpp - Example program compares to ranges lexicographically.
 *
 * $Id$
 *
 ***************************************************************************
 *
 * Copyright (c) 1994-2005 Quovadx,  Inc., acting through its  Rogue Wave
 * Software division. Licensed under the Apache License, Version 2.0 (the
 * "License");  you may  not use this file except  in compliance with the
 * License.    You    may   obtain   a   copy   of    the   License    at
 * http://www.apache.org/licenses/LICENSE-2.0.    Unless   required    by
 * applicable law  or agreed to  in writing,  software  distributed under
 * the License is distributed on an "AS IS" BASIS,  WITHOUT WARRANTIES OR
 * CONDITIONS OF  ANY KIND, either  express or implied.  See  the License
 * for the specific language governing permissions  and limitations under
 * the License.
 * 
 **************************************************************************/

#include <algorithm>    // for lexicographical_compare
#include <functional>   // for less
#include <ios>          // for boolalpha
#include <iostream>     // for cout, endl
#include <vector>       // for vector

#include <examples.h>


int main()
{
    typedef std::vector<int, std::allocator<int> > Vector;

    const Vector::value_type d1[] = { 1, 3, 5, 32, 64 }; 		
    const Vector::value_type d2[] = { 1, 3, 2, 43, 56 };

    // Create vectors.
    const Vector v1 (d1 + 0, d1 + sizeof d1 / sizeof *d1);
    const Vector v2 (d2 + 0, d2 + sizeof d1 / sizeof *d2);

    // Is v1 less than v2 (I think not).
    bool b1 = std::lexicographical_compare (v1.begin (), v1.end (),
                                            v2.begin (), v2.end ());
    // Is v2 less than v1 (yup, sure is).
    bool b2 = std::lexicographical_compare (v2.begin (), v2.end (),
                                            v1.begin (), v1.end (),
                                            std::less<int>());
    std::cout << std::boolalpha << b1
              << " " << b2 << std::endl;

    return 0;
}