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Atmosphere/libraries/libstratosphere/include/stratosphere/sf/sf_shared_object.hpp

199 lines
6.5 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/sf/sf_common.hpp>
#include <stratosphere/sf/sf_out.hpp>
namespace ams::sf {
class ISharedObject {
NON_COPYABLE(ISharedObject);
NON_MOVEABLE(ISharedObject);
protected:
constexpr ISharedObject() { /* ... */ }
~ISharedObject() { /* ... */ }
public:
constexpr virtual void AddReference() = 0;
constexpr virtual void Release() = 0;
};
namespace impl {
class SharedPointerBase {
private:
ISharedObject *m_ptr;
private:
constexpr void AddReferenceImpl() const {
if (m_ptr != nullptr) {
m_ptr->AddReference();
}
}
constexpr void ReleaseImpl() const {
if (m_ptr != nullptr) {
m_ptr->Release();
}
}
public:
constexpr SharedPointerBase() : m_ptr(nullptr) { /* ... */ }
constexpr SharedPointerBase(ISharedObject *ptr, bool incref) : m_ptr(ptr) {
if (incref) {
this->AddReferenceImpl();
}
}
constexpr ~SharedPointerBase() {
this->ReleaseImpl();
}
constexpr SharedPointerBase(const SharedPointerBase &rhs) : m_ptr(rhs.m_ptr) {
this->AddReferenceImpl();
}
constexpr SharedPointerBase(SharedPointerBase &&rhs) : m_ptr(rhs.m_ptr) {
rhs.m_ptr = nullptr;
}
constexpr SharedPointerBase &operator=(const SharedPointerBase &rhs) {
SharedPointerBase tmp(rhs);
tmp.swap(*this);
return *this;
}
constexpr SharedPointerBase &operator=(SharedPointerBase &&rhs) {
SharedPointerBase tmp(std::move(rhs));
tmp.swap(*this);
return *this;
}
constexpr void swap(SharedPointerBase &rhs) {
std::swap(m_ptr, rhs.m_ptr);
}
constexpr ISharedObject *Detach() {
ISharedObject *ret = m_ptr;
m_ptr = nullptr;
return ret;
}
constexpr ISharedObject *Get() const {
return m_ptr;
}
};
}
template<typename I>
class SharedPointer {
template<typename> friend class ::ams::sf::SharedPointer;
template<typename> friend class ::ams::sf::Out;
public:
using Interface = I;
private:
impl::SharedPointerBase m_base;
public:
constexpr SharedPointer() : m_base() { /* ... */ }
constexpr SharedPointer(std::nullptr_t) : m_base() { /* ... */ }
constexpr SharedPointer(Interface *ptr, bool incref) : m_base(static_cast<ISharedObject *>(ptr), incref) { /* ... */ }
constexpr SharedPointer(const SharedPointer &rhs) : m_base(rhs.m_base) { /* ... */ }
constexpr SharedPointer(SharedPointer &&rhs) : m_base(std::move(rhs.m_base)) { /* ... */ }
template<typename U> requires std::derived_from<U, Interface>
constexpr SharedPointer(const SharedPointer<U> &rhs) : m_base(rhs.m_base) { /* ... */ }
template<typename U> requires std::derived_from<U, Interface>
constexpr SharedPointer(SharedPointer<U> &&rhs) : m_base(std::move(rhs.m_base)) { /* ... */ }
constexpr SharedPointer &operator=(std::nullptr_t) {
SharedPointer().swap(*this);
return *this;
}
constexpr SharedPointer &operator=(const SharedPointer &rhs) {
SharedPointer tmp(rhs);
tmp.swap(*this);
return *this;
}
constexpr SharedPointer &operator=(SharedPointer &&rhs) {
SharedPointer tmp(std::move(rhs));
tmp.swap(*this);
return *this;
}
template<typename U> requires std::derived_from<U, Interface>
constexpr SharedPointer &operator=(const SharedPointer<U> &rhs) {
SharedPointer tmp(rhs);
tmp.swap(*this);
return *this;
}
template<typename U> requires std::derived_from<U, Interface>
constexpr SharedPointer &operator=(SharedPointer<U> &&rhs) {
SharedPointer tmp(std::move(rhs));
tmp.swap(*this);
return *this;
}
constexpr void swap(SharedPointer &rhs) {
m_base.swap(rhs.m_base);
}
constexpr Interface *Detach() {
return static_cast<Interface *>(m_base.Detach());
}
constexpr void Reset() {
*this = nullptr;
}
constexpr Interface *Get() const {
return static_cast<Interface *>(m_base.Get());
}
constexpr Interface *operator->() const {
AMS_ASSERT(this->Get() != nullptr);
return this->Get();
}
constexpr bool operator!() const {
return this->Get() == nullptr;
}
constexpr bool operator==(std::nullptr_t) const {
return this->Get() == nullptr;
}
constexpr bool operator!=(std::nullptr_t) const {
return this->Get() != nullptr;
}
};
template<typename Interface>
constexpr void Swap(SharedPointer<Interface> &lhs, SharedPointer<Interface> &rhs) {
lhs.swap(rhs);
}
constexpr inline void ReleaseSharedObject(ISharedObject *ptr) {
ptr->Release();
}
}