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scope_guard.hpp
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scope_guard.hpp
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/*
* Copyright (c) Facebook, Inc. and its affiliates.
*
* Licensed under the Apache License Version 2.0 with LLVM Exceptions
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* https://llvm.org/LICENSE.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <type_traits>
#include <utility>
#include <unifex/detail/prologue.hpp>
namespace unifex {
template <typename Func>
struct [[nodiscard]] scope_guard {
private:
static_assert(std::is_nothrow_move_constructible_v<Func>);
UNIFEX_NO_UNIQUE_ADDRESS Func func_;
bool released_ = false;
public:
scope_guard(Func&& func) noexcept : func_((Func &&) func) {}
~scope_guard() { reset(); }
void release() noexcept { released_ = true; }
void reset() noexcept {
static_assert(noexcept(((Func &&) func_)()));
if (!std::exchange(released_, true)) {
((Func &&) func_)();
}
}
};
template <typename Func>
scope_guard(Func&& func) -> scope_guard<Func>;
} // namespace unifex
#include <unifex/detail/epilogue.hpp>