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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.
*/
// Portions of this code are derived from
//
// Manjunath Kudlur's Carbon library
//
// and
//
// Based on Boost.Phoenix v1.2
// Copyright (c) 2001-2002 Joel de Guzman
#pragma once
#include <thrust/detail/config.h>
#include <thrust/detail/functional/composite.h>
#include <thrust/detail/functional/operators/assignment_operator.h>
#include <thrust/functional.h>
#include <thrust/type_traits/logical_metafunctions.h>
#include <type_traits>
THRUST_NAMESPACE_BEGIN
namespace detail
{
namespace functional
{
template<typename Eval>
THRUST_HOST_DEVICE
constexpr actor<Eval>
::actor()
: eval_type()
{}
template<typename Eval>
THRUST_HOST_DEVICE
actor<Eval>
::actor(const Eval &base)
: eval_type(base)
{}
// actor::operator() needs to construct a tuple of references to its
// arguments. To make this work with thrust::reference<T>, we need to
// detect thrust proxy references and store them as T rather than T&.
// This check ensures that the forwarding references passed into
// actor::operator() are either:
// - T&& if and only if T is a thrust::reference<U>, or
// - T& for any other types.
// This struct provides a nicer diagnostic for when these conditions aren't
// met.
template <typename T>
using actor_check_ref_type =
thrust::detail::integral_constant<bool,
( std::is_lvalue_reference<T>::value ||
thrust::detail::is_wrapped_reference<T>::value )>;
template <typename... Ts>
using actor_check_ref_types =
thrust::conjunction<actor_check_ref_type<Ts>...>;
template<typename Eval>
template<typename... Ts>
THRUST_HOST_DEVICE
typename apply_actor<typename actor<Eval>::eval_type,
thrust::tuple<eval_ref<Ts>...>>::type
actor<Eval>::operator()(Ts&&... ts) const
{
static_assert(actor_check_ref_types<Ts...>::value,
"Actor evaluations only support rvalue references to "
"thrust::reference subclasses.");
using tuple_type = thrust::tuple<eval_ref<Ts>...>;
return eval_type::eval(tuple_type(THRUST_FWD(ts)...));
} // end actor<Eval>::operator()
template<typename Eval>
template<typename T>
THRUST_HOST_DEVICE
typename assign_result<Eval,T>::type
actor<Eval>
::operator=(const T& _1) const
{
return do_assign(*this,_1);
} // end actor::operator=()
} // end functional
} // end detail
THRUST_NAMESPACE_END
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