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