68 lines
1.7 KiB
C++
68 lines
1.7 KiB
C++
/*
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* Copyright (C) 2014 The Android Open Source Project
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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 <utility> // for std::move, std::forward
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namespace android {
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namespace base {
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// ScopeGuard ensures that the specified functor is executed no matter how the
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// current scope exits.
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template <typename F>
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class ScopeGuard {
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public:
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ScopeGuard(F&& f) : f_(std::forward<F>(f)), active_(true) {}
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ScopeGuard(ScopeGuard&& that) noexcept : f_(std::move(that.f_)), active_(that.active_) {
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that.active_ = false;
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}
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template <typename Functor>
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ScopeGuard(ScopeGuard<Functor>&& that) : f_(std::move(that.f_)), active_(that.active_) {
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that.active_ = false;
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}
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~ScopeGuard() {
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if (active_) f_();
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}
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ScopeGuard() = delete;
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ScopeGuard(const ScopeGuard&) = delete;
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void operator=(const ScopeGuard&) = delete;
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void operator=(ScopeGuard&& that) = delete;
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void Disable() { active_ = false; }
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bool active() const { return active_; }
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private:
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template <typename Functor>
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friend class ScopeGuard;
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F f_;
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bool active_;
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};
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template <typename F>
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ScopeGuard<F> make_scope_guard(F&& f) {
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return ScopeGuard<F>(std::forward<F>(f));
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}
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} // namespace base
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} // namespace android
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