51 lines
1.1 KiB
C++
51 lines
1.1 KiB
C++
/*
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* Copyright (c) 2016-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under both the BSD-style license (found in the
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* LICENSE file in the root directory of this source tree) and the GPLv2 (found
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* in the COPYING file in the root directory of this source tree).
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*/
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#pragma once
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#include <utility>
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namespace pzstd {
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/**
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* Dismissable scope guard.
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* `Function` must be callable and take no parameters.
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* Unless `dismiss()` is called, the callable is executed upon destruction of
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* `ScopeGuard`.
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*
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* Example:
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*
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* auto guard = makeScopeGuard([&] { cleanup(); });
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*/
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template <typename Function>
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class ScopeGuard {
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Function function;
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bool dismissed;
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public:
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explicit ScopeGuard(Function&& function)
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: function(std::move(function)), dismissed(false) {}
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void dismiss() {
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dismissed = true;
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}
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~ScopeGuard() noexcept {
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if (!dismissed) {
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function();
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}
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}
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};
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/// Creates a scope guard from `function`.
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template <typename Function>
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ScopeGuard<Function> makeScopeGuard(Function&& function) {
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return ScopeGuard<Function>(std::forward<Function>(function));
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}
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}
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