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Atmosphere/libraries/libstratosphere/source/fs/fs_scoped_setter.hpp
2021-10-10 00:14:06 -07:00

60 lines
1.8 KiB
C++

/*
* Copyright (c) Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <stratosphere.hpp>
namespace ams::fs {
template<typename T>
class ScopedSetter {
NON_COPYABLE(ScopedSetter);
private:
T *m_ptr;
T m_value;
public:
constexpr ALWAYS_INLINE ScopedSetter(T &p, T v) : m_ptr(std::addressof(p)), m_value(v) { /* ... */ }
ALWAYS_INLINE ~ScopedSetter() {
if (m_ptr) {
*m_ptr = m_value;
}
}
ALWAYS_INLINE ScopedSetter(ScopedSetter &&rhs) {
m_ptr = rhs.ptr;
m_value = rhs.value;
rhs.Reset();
}
ALWAYS_INLINE ScopedSetter &operator=(ScopedSetter &&rhs) {
m_ptr = rhs.ptr;
m_value = rhs.value;
rhs.Reset();
return *this;
}
ALWAYS_INLINE void Set(T v) { m_value = v; }
private:
ALWAYS_INLINE void Reset() {
m_ptr = nullptr;
}
};
template<typename T>
ALWAYS_INLINE ScopedSetter<T> MakeScopedSetter(T &p, T v) {
return ScopedSetter<T>(p, v);
}
}