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/*
* Copyright 2008-2013 NVIDIA Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*! \file general_copy.h
* \brief Sequential copy algorithms for general iterators.
*/
#pragma once
#include <thrust/detail/config.h>
#include <thrust/detail/raw_reference_cast.h>
#include <thrust/detail/type_traits.h>
THRUST_NAMESPACE_BEGIN
namespace system
{
namespace detail
{
namespace sequential
{
namespace general_copy_detail
{
template<typename T1, typename T2>
struct lazy_is_assignable
: thrust::detail::is_assignable<
typename T1::type,
typename T2::type
>
{};
// sometimes OutputIterator's reference type is reported as void
// in that case, just assume that we're able to assign to it OK
template<typename InputIterator, typename OutputIterator>
struct reference_is_assignable
: thrust::detail::eval_if<
thrust::detail::is_same<
typename thrust::iterator_reference<OutputIterator>::type, void
>::value,
thrust::detail::true_type,
lazy_is_assignable<
thrust::iterator_reference<OutputIterator>,
thrust::iterator_reference<InputIterator>
>
>::type
{};
// introduce an iterator assign helper to deal with assignments from
// a wrapped reference
__thrust_exec_check_disable__
template<typename OutputIterator, typename InputIterator>
inline __host__ __device__
typename thrust::detail::enable_if<
reference_is_assignable<InputIterator,OutputIterator>::value
>::type
iter_assign(OutputIterator dst, InputIterator src)
{
*dst = *src;
}
__thrust_exec_check_disable__
template<typename OutputIterator, typename InputIterator>
inline __host__ __device__
typename thrust::detail::disable_if<
reference_is_assignable<InputIterator,OutputIterator>::value
>::type
iter_assign(OutputIterator dst, InputIterator src)
{
typedef typename thrust::iterator_value<InputIterator>::type value_type;
// insert a temporary and hope for the best
*dst = static_cast<value_type>(*src);
}
} // end general_copy_detail
__thrust_exec_check_disable__
template<typename InputIterator,
typename OutputIterator>
__host__ __device__
OutputIterator general_copy(InputIterator first,
InputIterator last,
OutputIterator result)
{
for(; first != last; ++first, ++result)
{
// gcc 4.2 crashes while instantiating iter_assign
#if (THRUST_HOST_COMPILER == THRUST_HOST_COMPILER_GCC) && (THRUST_GCC_VERSION < 40300)
*result = *first;
#else
general_copy_detail::iter_assign(result, first);
#endif
}
return result;
} // end general_copy()
__thrust_exec_check_disable__
template<typename InputIterator,
typename Size,
typename OutputIterator>
__host__ __device__
OutputIterator general_copy_n(InputIterator first,
Size n,
OutputIterator result)
{
for(; n > Size(0); ++first, ++result, --n)
{
// gcc 4.2 crashes while instantiating iter_assign
#if (THRUST_HOST_COMPILER == THRUST_HOST_COMPILER_GCC) && (THRUST_GCC_VERSION < 40300)
*result = *first;
#else
general_copy_detail::iter_assign(result, first);
#endif
}
return result;
} // end general_copy_n()
} // end namespace sequential
} // end namespace detail
} // end namespace system
THRUST_NAMESPACE_END
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