Ticket #1127: test_multi_array_view_neg_stride.cpp

#include <boost/multi_array.hpp>
#include <boost/multi_array/index_range.hpp>
#include <boost/detail/lightweight_test.hpp>

#ifdef DEBUG_OUTPUT
#include <iostream>
#endif

int
main()
{
    typedef boost::multi_array<size_t, 1> MA;

    MA ma(boost::extents[8]);

    for (size_t i = 0; i < 4; ++i)
    {
        ma[i] = i;
    }

    MA::const_array_view<1>::type src =
        ma[boost::indices[MA::index_range(0,4)]];

#ifdef FUDGED_RANGE
    // This is wrong, but works.
    MA::array_view<1>::type dst =
        ma[boost::indices[MA::index_range(7,5,-1)]];
#else
    // This is correct, but fails.
    MA::array_view<1>::type dst =
        ma[boost::indices[MA::index_range(7,3,-1)]];
#endif

#ifdef DEBUG_OUTPUT
    std::cout << "src.shape()[0] = " << src.shape()[0] << std::endl;
    std::cout << "dst.shape()[0] = " << dst.shape()[0] << std::endl;
#endif

    BOOST_TEST(src.shape()[0] == dst.shape()[0]);

    dst = src;

    for (size_t i = 0; i < 4; ++i)
    {
        BOOST_TEST(ma[i] == i);
        BOOST_TEST(ma[i] == ma[7 - i]);
    }

    return boost::report_errors();
}