boost/compute/algorithm/transform.hpp
//---------------------------------------------------------------------------//
// 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.
//---------------------------------------------------------------------------//
#ifndef BOOST_COMPUTE_ALGORITHM_TRANSFORM_HPP
#define BOOST_COMPUTE_ALGORITHM_TRANSFORM_HPP
#include <boost/static_assert.hpp>
#include <boost/compute/system.hpp>
#include <boost/compute/command_queue.hpp>
#include <boost/compute/algorithm/copy.hpp>
#include <boost/compute/iterator/transform_iterator.hpp>
#include <boost/compute/iterator/zip_iterator.hpp>
#include <boost/compute/functional/detail/unpack.hpp>
#include <boost/compute/type_traits/is_device_iterator.hpp>
namespace boost {
namespace compute {
/// Transforms the elements in the range [\p first, \p last) using
/// operator \p op and stores the results in the range beginning at
/// \p result.
///
/// For example, to calculate the absolute value for each element in a vector:
///
/// \snippet test/test_transform.cpp transform_abs
///
/// Space complexity: \Omega(1)
///
/// \see copy()
template<class InputIterator, class OutputIterator, class UnaryOperator>
inline OutputIterator transform(InputIterator first,
InputIterator last,
OutputIterator result,
UnaryOperator op,
command_queue &queue = system::default_queue())
{
BOOST_STATIC_ASSERT(is_device_iterator<InputIterator>::value);
BOOST_STATIC_ASSERT(is_device_iterator<OutputIterator>::value);
return copy(
::boost::compute::make_transform_iterator(first, op),
::boost::compute::make_transform_iterator(last, op),
result,
queue
);
}
/// \overload
template<class InputIterator1,
class InputIterator2,
class OutputIterator,
class BinaryOperator>
inline OutputIterator transform(InputIterator1 first1,
InputIterator1 last1,
InputIterator2 first2,
OutputIterator result,
BinaryOperator op,
command_queue &queue = system::default_queue())
{
BOOST_STATIC_ASSERT(is_device_iterator<InputIterator1>::value);
BOOST_STATIC_ASSERT(is_device_iterator<InputIterator2>::value);
BOOST_STATIC_ASSERT(is_device_iterator<OutputIterator>::value);
typedef typename std::iterator_traits<InputIterator1>::difference_type difference_type;
difference_type n = std::distance(first1, last1);
return transform(
::boost::compute::make_zip_iterator(boost::make_tuple(first1, first2)),
::boost::compute::make_zip_iterator(boost::make_tuple(last1, first2 + n)),
result,
detail::unpack(op),
queue
);
}
} // end compute namespace
} // end boost namespace
#endif // BOOST_COMPUTE_ALGORITHM_TRANSFORM_HPP