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/*
* Copyright 2018-2021 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
* \brief C++17's `void_t`.
*/
#pragma once
#include <thrust/detail/config.h>
#if THRUST_CPP_DIALECT >= 2017
# include <type_traits>
#endif
THRUST_NAMESPACE_BEGIN
/*! \addtogroup utility
* \{
*/
/*! \addtogroup type_traits Type Traits
* \{
*/
/*! \brief Utility trait that maps a sequence of any types to the type void.
*/
template <typename...> struct voider
{
/*! \brief The resulting type (always void). */
using type = void;
};
#if THRUST_CPP_DIALECT >= 2017
using std::void_t;
#else
template <typename... Ts> using void_t = typename voider<Ts...>::type;
#endif
/*! \} // type traits
*/
/*! \} // utility
*/
THRUST_NAMESPACE_END
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