/*
 *  Copyright 2008-2021 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.
 */

#pragma once

#include <thrust/detail/config.h>

#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
#  pragma GCC system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
#  pragma clang system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
#  pragma system_header
#endif // no system header

#include <thrust/detail/type_traits.h>

#include <utility> // for std::declval
#if !_THRUST_HAS_DEVICE_SYSTEM_STD
#  include <type_traits>
#endif

#define __THRUST_DEFINE_HAS_MEMBER_FUNCTION(trait_name, member_function_name)                                       \
  template <typename T, typename Signature, typename = void>                                                        \
  struct trait_name : thrust::false_type                                                                            \
  {};                                                                                                               \
                                                                                                                    \
  template <typename T, typename ResultT, typename... Args>                                                         \
  struct trait_name<                                                                                                \
    T,                                                                                                              \
    ResultT(Args...),                                                                                               \
    _THRUST_STD::enable_if_t<                                                                                       \
      _THRUST_STD::is_same<ResultT, void>::value                                                                    \
      || _THRUST_STD::                                                                                              \
        is_convertible<ResultT, decltype(std::declval<T>().member_function_name(std::declval<Args>()...))>::value>> \
      : thrust::true_type                                                                                           \
  {};
