Abseil Common Libraries (C++) (grcp 依赖)
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79 lines
2.0 KiB
79 lines
2.0 KiB
// Copyright 2021 The Abseil Authors. |
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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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// https://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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#ifndef ABSL_CLEANUP_INTERNAL_CLEANUP_H_ |
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#define ABSL_CLEANUP_INTERNAL_CLEANUP_H_ |
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#include <type_traits> |
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#include <utility> |
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#include "absl/base/internal/invoke.h" |
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#include "absl/base/thread_annotations.h" |
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#include "absl/utility/utility.h" |
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namespace absl { |
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ABSL_NAMESPACE_BEGIN |
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namespace cleanup_internal { |
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struct Tag {}; |
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template <typename Arg, typename... Args> |
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constexpr bool WasDeduced() { |
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return (std::is_same<cleanup_internal::Tag, Arg>::value) && |
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(sizeof...(Args) == 0); |
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} |
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template <typename Callback> |
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constexpr bool ReturnsVoid() { |
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return (std::is_same<base_internal::invoke_result_t<Callback>, void>::value); |
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} |
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template <typename Callback> |
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class Storage { |
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public: |
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Storage() = delete; |
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Storage(Callback callback, bool engaged) |
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: callback_(std::move(callback)), engaged_(engaged) {} |
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Storage(Storage&& other) |
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: callback_(std::move(other.callback_)), |
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engaged_(absl::exchange(other.engaged_, false)) {} |
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Storage(const Storage& other) = delete; |
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Storage& operator=(Storage&& other) = delete; |
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Storage& operator=(const Storage& other) = delete; |
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bool IsCallbackEngaged() const { return engaged_; } |
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void DisengageCallback() { engaged_ = false; } |
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void InvokeCallback() ABSL_NO_THREAD_SAFETY_ANALYSIS { |
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std::move(callback_)(); |
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} |
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private: |
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Callback callback_; |
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bool engaged_; |
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}; |
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} // namespace cleanup_internal |
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ABSL_NAMESPACE_END |
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} // namespace absl |
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#endif // ABSL_CLEANUP_INTERNAL_CLEANUP_H_
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