sum_diff.cc   [plain text]

// Copyright (C) 2001 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING.  If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.

// 26.4.3 [lib.partial.sum]
// 26.4.4 [lib.adjacent.difference]

#include <algorithm>
#include <numeric>
#include <cassert>

int A[] = {1, 4, 9, 16, 25, 36, 49, 64, 81, 100};
int B[] = {1, 3, 5, 7, 9, 11, 13, 15, 17, 19};
const int N = sizeof(A) / sizeof(int);

void
test01()
{
    int D[N];

    std::adjacent_difference(A, A + N, D);
    assert(std::equal(D, D + N, B));

    std::partial_sum(D, D + N, D);
    assert(std::equal(D, D + N, A));
}

int
main(int argc, char* argv[])
{
    test01();
    return 0;
}