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60 lines
1.8 KiB
C++
60 lines
1.8 KiB
C++
/*
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* Copyright 2016 Facebook, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <folly/Traits.h>
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#include <array>
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#include <type_traits>
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#include <utility>
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namespace folly {
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namespace array_detail {
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template <typename>
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struct is_ref_wrapper : std::false_type {};
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template <typename T>
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struct is_ref_wrapper<std::reference_wrapper<T>> : std::true_type {};
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template <typename T>
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using not_ref_wrapper =
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folly::Negation<is_ref_wrapper<typename std::decay<T>::type>>;
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template <typename D, typename...>
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struct return_type_helper {
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using type = D;
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};
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template <typename... TList>
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struct return_type_helper<void, TList...> {
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static_assert(
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folly::Conjunction<not_ref_wrapper<TList>...>::value,
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"TList cannot contain reference_wrappers when D is void");
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using type = typename std::common_type<TList...>::type;
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};
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template <typename D, typename... TList>
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using return_type = std::
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array<typename return_type_helper<D, TList...>::type, sizeof...(TList)>;
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} // !array_detail
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template <typename D = void, typename... TList>
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constexpr array_detail::return_type<D, TList...> make_array(TList&&... t) {
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using value_type =
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typename array_detail::return_type_helper<D, TList...>::type;
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return {static_cast<value_type>(std::forward<TList>(t))...};
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}
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} // !folly
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