52 lines
1.5 KiB
C++
52 lines
1.5 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* Licensed under the Apache License Version 2.0 with LLVM Exceptions
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* https://llvm.org/LICENSE.txt
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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 <unifex/tag_invoke.hpp>
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#include <cstddef>
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#include <memory>
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#include <type_traits>
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#include <unifex/detail/prologue.hpp>
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namespace unifex {
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namespace _get_alloc {
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inline const struct _fn {
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template <typename T>
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constexpr auto operator()(const T&) const noexcept
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-> std::enable_if_t<!is_tag_invocable_v<_fn, const T&>,
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std::allocator<std::byte>> {
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return std::allocator<std::byte>{};
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}
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template <typename T>
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constexpr auto operator()(const T& object) const noexcept
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-> tag_invoke_result_t<_fn, const T&> {
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return tag_invoke(*this, object);
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}
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} get_allocator{};
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} // namespace _get_alloc
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using _get_alloc::get_allocator;
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template <typename T>
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using get_allocator_t = decltype(get_allocator(std::declval<T>()));
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} // namespace unifex
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#include <unifex/detail/epilogue.hpp>
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