test_transform_iterator.cpp

//---------------------------------------------------------------------------//
// Copyright (c) 2013 Kyle Lutz <kyle.r.lutz@gmail.com>
//
// Distributed under the Boost Software License, Version 1.0
// See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt
//
// See http://boostorg.github.com/compute for more information.
//---------------------------------------------------------------------------//

#define BOOST_TEST_MODULE TestTransformIterator
#include <boost/test/unit_test.hpp>

#include <iterator>

#include <boost/type_traits.hpp>
#include <boost/static_assert.hpp>

#include <boost/compute/types.hpp>
#include <boost/compute/functional.hpp>
#include <boost/compute/algorithm/copy.hpp>
#include <boost/compute/container/vector.hpp>
#include <boost/compute/iterator/buffer_iterator.hpp>
#include <boost/compute/iterator/transform_iterator.hpp>

#include "check_macros.hpp"
#include "context_setup.hpp"

BOOST_AUTO_TEST_CASE(value_type)
{
    using boost::compute::float4_;

    BOOST_STATIC_ASSERT((
        boost::is_same<
            boost::compute::transform_iterator<
                boost::compute::buffer_iterator<float>,
                boost::compute::sqrt<float>
            >::value_type,
            float
        >::value
    ));
    BOOST_STATIC_ASSERT((
        boost::is_same<
            boost::compute::transform_iterator<
                boost::compute::buffer_iterator<float4_>,
                boost::compute::length<float4_>
            >::value_type,
            float
        >::value
    ));
}

BOOST_AUTO_TEST_CASE(base_type)
{
    BOOST_STATIC_ASSERT((
        boost::is_same<
            boost::compute::transform_iterator<
                boost::compute::buffer_iterator<int>, boost::compute::abs<int>
            >::base_type,
            boost::compute::buffer_iterator<int>
        >::value
    ));
}

BOOST_AUTO_TEST_CASE(copy)
{
    int data[] = { 1, -2, 3, -4, 5 };
    boost::compute::vector<int> a(data, data + 5, queue);

    boost::compute::vector<int> b(5, context);
    boost::compute::copy(
        boost::compute::make_transform_iterator(
            a.begin(),
            boost::compute::abs<int>()
        ),
        boost::compute::make_transform_iterator(
            a.end(),
            boost::compute::abs<int>()
        ),
        b.begin(),
        queue
    );
    CHECK_RANGE_EQUAL(int, 5, b, (1, 2, 3, 4, 5));
}

BOOST_AUTO_TEST_CASE(copy_abs_doctest)
{
    int data[] = { -1, -2, -3, -4 };
    boost::compute::vector<int> input(data, data + 4, queue);
    boost::compute::vector<int> output(4, context);

//! [copy_abs]
// use abs() from boost.compute
using boost::compute::abs;

// copy the absolute value for each element in input to output
boost::compute::copy(
    boost::compute::make_transform_iterator(input.begin(), abs<int>()),
    boost::compute::make_transform_iterator(input.end(), abs<int>()),
    output.begin(),
    queue
);
//! [copy_abs]

    CHECK_RANGE_EQUAL(int, 4, output, (1, 2, 3, 4));
}

BOOST_AUTO_TEST_SUITE_END()