pcsx2/common/ScopedGuard.h

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2021-10-15 23:57:50 +00:00
/* PCSX2 - PS2 Emulator for PCs
* Copyright (C) 2002-2021 PCSX2 Dev Team
*
* PCSX2 is free software: you can redistribute it and/or modify it under the terms
* of the GNU Lesser General Public License as published by the Free Software Found-
* ation, either version 3 of the License, or (at your option) any later version.
*
* PCSX2 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
* PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with PCSX2.
* If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include "Pcsx2Defs.h"
#include <optional>
#include <utility>
/// ScopedGuard provides an object which runs a function (usually a lambda) when
/// it goes out of scope. This can be useful for releasing resources or handles
/// which do not normally have C++ types to automatically release.
template <typename T>
class ScopedGuard final
{
public:
__fi ScopedGuard(T&& func)
: m_func(std::forward<T>(func))
{
}
__fi ScopedGuard(ScopedGuard&& other)
: m_func(std::move(other.m_func))
{
other.m_func = nullptr;
}
__fi ~ScopedGuard()
{
if (!m_func.has_value())
return;
m_func.value()();
m_func.reset();
}
ScopedGuard(const ScopedGuard&) = delete;
void operator=(const ScopedGuard&) = delete;
/// Prevents the function from being invoked when we go out of scope.
__fi void Cancel()
{
m_func.reset();
}
private:
std::optional<T> m_func;
};