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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.
*/
#pragma once
#include <thrust/detail/config.h>
#include <thrust/detail/functional/argument.h>
#include <thrust/detail/type_deduction.h>
#include <thrust/tuple.h>
#include <thrust/detail/type_traits.h>
#include <thrust/type_traits/void_t.h>
#include <type_traits>
THRUST_NAMESPACE_BEGIN
namespace detail
{
namespace functional
{
// Adapts a transparent unary functor from functional.h (e.g. thrust::negate<>)
// into the Eval interface.
template <typename UnaryFunctor>
struct transparent_unary_operator
{
template <typename>
using operator_type = UnaryFunctor;
template <typename Env>
using argument =
typename thrust::detail::eval_if<
thrust::tuple_size<Env>::value != 1,
thrust::detail::identity_<thrust::null_type>,
thrust::detail::functional::argument_helper<0, Env>
>::type;
template <typename Env>
struct result_type_impl
{
using type = decltype(
std::declval<UnaryFunctor>()(std::declval<argument<Env>>()));
};
template <typename Env>
using result_type =
typename thrust::detail::eval_if<
std::is_same<thrust::null_type, argument<Env>>::value,
thrust::detail::identity_<thrust::null_type>,
result_type_impl<Env>
>::type;
template <typename Env>
struct result
{
using op_type = UnaryFunctor;
using type = result_type<Env>;
};
template <typename Env>
__host__ __device__
result_type<Env> eval(Env&& e) const
THRUST_RETURNS(UnaryFunctor{}(thrust::get<0>(THRUST_FWD(e))))
};
// Adapts a transparent binary functor from functional.h (e.g. thrust::less<>)
// into the Eval interface.
template <typename BinaryFunctor>
struct transparent_binary_operator
{
template <typename>
using operator_type = BinaryFunctor;
template <typename Env>
using first_argument =
typename thrust::detail::eval_if<
thrust::tuple_size<Env>::value != 2,
thrust::detail::identity_<thrust::null_type>,
thrust::detail::functional::argument_helper<0, Env>
>::type;
template <typename Env>
using second_argument =
typename thrust::detail::eval_if<
thrust::tuple_size<Env>::value != 2,
thrust::detail::identity_<thrust::null_type>,
thrust::detail::functional::argument_helper<1, Env>
>::type;
template <typename Env>
struct result_type_impl
{
using type = decltype(
std::declval<BinaryFunctor>()(std::declval<first_argument<Env>>(),
std::declval<second_argument<Env>>()));
};
template <typename Env>
using result_type =
typename thrust::detail::eval_if<
(std::is_same<thrust::null_type, first_argument<Env>>::value ||
std::is_same<thrust::null_type, second_argument<Env>>::value),
thrust::detail::identity_<thrust::null_type>,
result_type_impl<Env>
>::type;
template <typename Env>
struct result
{
using op_type = BinaryFunctor;
using type = result_type<Env>;
};
template <typename Env>
__host__ __device__
result_type<Env> eval(Env&& e) const
THRUST_RETURNS(BinaryFunctor{}(thrust::get<0>(e), thrust::get<1>(e)))
};
} // end functional
} // end detail
THRUST_NAMESPACE_END
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