xref: /external/libcxx/test/algorithms/alg.modifying.operations/alg.copy/copy_backward.pass.cpp

//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

// <algorithm>

// template<BidirectionalIterator InIter, BidirectionalIterator OutIter>
//   requires OutputIterator<OutIter, InIter::reference>
//   OutIter
//   copy_backward(InIter first, InIter last, OutIter result);

#include <algorithm>
#include <cassert>

#include "test_iterators.h"

template <class InIter, class OutIter>
void
test()
{
    const unsigned N = 1000;
    int ia[N];
    for (unsigned i = 0; i < N; ++i)
        ia[i] = i;
    int ib[N] = {0};

    OutIter r = std::copy_backward(InIter(ia), InIter(ia+N), OutIter(ib+N));
    assert(base(r) == ib);
    for (unsigned i = 0; i < N; ++i)
        assert(ia[i] == ib[i]);
}

int main()
{
    test<bidirectional_iterator<const int*>, bidirectional_iterator<int*> >();
    test<bidirectional_iterator<const int*>, random_access_iterator<int*> >();
    test<bidirectional_iterator<const int*>, int*>();

    test<random_access_iterator<const int*>, bidirectional_iterator<int*> >();
    test<random_access_iterator<const int*>, random_access_iterator<int*> >();
    test<random_access_iterator<const int*>, int*>();

    test<const int*, bidirectional_iterator<int*> >();
    test<const int*, random_access_iterator<int*> >();
    test<const int*, int*>();
}