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40 lines
1.1 KiB
C++
40 lines
1.1 KiB
C++
// SPDX-FileCopyrightText: 2019-2022 Connor McLaughlin <stenzek@gmail.com>
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// SPDX-License-Identifier: (GPL-3.0 OR CC-BY-NC-ND-4.0)
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#pragma once
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#include "types.h"
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#include <optional>
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#include <utility>
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/// ScopedGuard provides an object which runs a function (usually a lambda) when
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/// it goes out of scope. This can be useful for releasing resources or handles
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/// which do not normally have C++ types to automatically release.
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template<typename T>
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class ScopedGuard final
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{
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public:
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ALWAYS_INLINE ScopedGuard(T&& func) : m_func(std::forward<T>(func)) {}
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ALWAYS_INLINE ScopedGuard(ScopedGuard&& other) : m_func(std::move(other.m_func)) { other.m_func = nullptr; }
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ALWAYS_INLINE ~ScopedGuard() { Run(); }
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ScopedGuard(const ScopedGuard&) = delete;
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void operator=(const ScopedGuard&) = delete;
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/// Runs the destructor function now instead of when we go out of scope.
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ALWAYS_INLINE void Run()
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{
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if (!m_func.has_value())
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return;
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m_func.value()();
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m_func.reset();
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}
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/// Prevents the function from being invoked when we go out of scope.
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ALWAYS_INLINE void Cancel() { m_func.reset(); }
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private:
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std::optional<T> m_func;
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};
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