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Atmosphere/libraries/libstratosphere/include/stratosphere/fssystem/fssystem_pimpl.hpp

70 lines
3 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 <vapours.hpp>
namespace ams::fssystem {
namespace impl {
template<typename T, size_t Size>
struct PimplHelper {
static void Construct(void *);
static void Destroy(void *);
};
}
template<typename T, size_t Size>
class Pimpl {
private:
#if defined(ATMOSPHERE_OS_HORIZON) || defined(ATMOSPHERE_OS_WINDOWS) || defined(ATMOSPHERE_OS_LINUX)
static constexpr size_t ExtraSizeToEnsureCompatibility = 0;
#elif defined(ATMOSPHERE_OS_MACOS)
static constexpr size_t ExtraSizeToEnsureCompatibility = 0x20;
#endif
static constexpr size_t StorageSize = Size + ExtraSizeToEnsureCompatibility;
private:
alignas(0x10) u8 m_storage[StorageSize];
public:
ALWAYS_INLINE Pimpl() { impl::PimplHelper<T, StorageSize>::Construct(m_storage); }
ALWAYS_INLINE ~Pimpl() { impl::PimplHelper<T, StorageSize>::Destroy(m_storage); }
ALWAYS_INLINE T *Get() { return reinterpret_cast<T *>(m_storage + 0); }
ALWAYS_INLINE T *operator->() { return reinterpret_cast<T *>(m_storage + 0); }
};
#define AMS_FSSYSTEM_ENABLE_PIMPL(_CLASSNAME_) \
namespace ams::fssystem::impl { \
\
template<size_t Size> \
struct PimplHelper<_CLASSNAME_, Size> { \
static ALWAYS_INLINE void Construct(void *p) { \
static_assert(sizeof(_CLASSNAME_) <= Size); \
static_assert(alignof(_CLASSNAME_) <= 0x10); \
\
std::construct_at(static_cast<_CLASSNAME_ *>(p)); \
} \
\
static ALWAYS_INLINE void Destroy(void *p) { \
std::destroy_at(static_cast<_CLASSNAME_ *>(p)); \
} \
}; \
\
}
}