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/************************************************************************
*
* Copyright (C) 2020-2023 IRCAD France
* Copyright (C) 2020 IHU Strasbourg
*
* This file is part of Sight.
*
* Sight 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 Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Sight 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Sight. If not, see <https://www.gnu.org/licenses/>.
*
***********************************************************************/
#pragma once
#include "weak_ptr.hpp"
#include <core/memory/buffer_object.hpp>
#include <core/memory/buffered.hpp>
#include <core/mt/types.hpp>
#include <type_traits>
namespace sight::data::mt
{
template<class DATATYPE>
class weak_ptr;
/**
* @brief This class holds a shared pointer on a data object, and acts as a mutex and a dump lock if the data own a
* data::array
*/
template<class DATATYPE>
class locked_ptr final
{
using lock = std::conditional_t<std::is_const_v<DATATYPE>, core::mt::read_lock, core::mt::write_lock>;
public:
/// Constructor
explicit constexpr locked_ptr(const std::shared_ptr<DATATYPE>& _data) noexcept :
m_data(_data)
{
if(m_data)
{
m_locker = lock(m_data->get_mutex());
if constexpr(std::is_base_of_v<core::memory::buffered, DATATYPE>)
{
m_dump_locks = m_data->dump_lock();
}
else if(const auto& buffered = std::dynamic_pointer_cast<const core::memory::buffered>(m_data); buffered)
{
m_dump_locks = buffered->dump_lock();
}
if constexpr(!std::is_const<DATATYPE>::value)
{
m_data->set_modified();
}
}
}
/// Constructor
explicit constexpr locked_ptr(const std::weak_ptr<DATATYPE>& _data) noexcept :
locked_ptr(_data.lock())
{
}
/// Constructor
explicit constexpr locked_ptr(const weak_ptr<DATATYPE>& _data) noexcept :
locked_ptr(_data.lock())
{
}
/// Assignment operator
constexpr locked_ptr& operator=(const std::shared_ptr<DATATYPE>& _data) noexcept
{
if(_data != m_data)
{
if(_data)
{
if constexpr(std::is_base_of_v<core::memory::buffered, DATATYPE>)
{
m_dump_locks = _data->dump_lock();
}
else if(const auto& buffered = std::dynamic_pointer_cast<const core::memory::buffered>(_data); buffered)
{
m_dump_locks = buffered->dump_lock();
}
else
{
m_dump_locks.clear();
}
m_locker = Lock(_data->get_mutex());
}
else
{
m_dump_locks.clear();
m_locker.reset();
}
m_data = _data;
}
return *this;
}
/// Assignment operator
constexpr locked_ptr& operator=(const std::weak_ptr<DATATYPE>& _data) noexcept
{
this->operator=(_data.lock());
return *this;
}
/// Assignment operator
constexpr locked_ptr& operator=(const weak_ptr<DATATYPE>& _data) noexcept
{
this->operator=(_data.lock());
return *this;
}
/// Default constructors, destructor and assignment operators
constexpr locked_ptr() = default;
constexpr locked_ptr(const locked_ptr&) = default;
constexpr locked_ptr(locked_ptr&&) = default;
constexpr locked_ptr& operator=(const locked_ptr&) = default;
constexpr locked_ptr& operator=(locked_ptr&&) = default;
inline ~locked_ptr() = default;
/// Returns the internal shared pointer
[[nodiscard]] constexpr std::shared_ptr<DATATYPE> get_shared() const noexcept
{
return m_data;
}
/// Returns a pointer to the hold data
[[nodiscard]] constexpr DATATYPE* get() const noexcept
{
return m_data.get();
}
/// Returns a reference to the hold data
constexpr DATATYPE& operator*() const noexcept
{
return *(get());
}
/// Returns a pointer to the hold data
constexpr DATATYPE* operator->() const noexcept
{
return get();
}
/// Checks if *this stores a non-null pointer, i.e. whether get() != nullptr
constexpr explicit operator bool() const noexcept
{
return m_data.operator bool();
}
/// Allows to compare pointer address
constexpr bool operator==(const locked_ptr<DATATYPE>& _data) const noexcept
{
return get() == _data.get();
}
/// Allows to compare pointer address
constexpr bool operator!=(const locked_ptr<DATATYPE>& _data) const noexcept
{
return get() != _data.get();
}
/// Allows to compare pointer address
constexpr bool operator==(const std::shared_ptr<DATATYPE>& _data) const noexcept
{
return get() == _data.get();
}
/// Allows to compare pointer address
constexpr bool operator!=(const std::shared_ptr<DATATYPE>& _data) const noexcept
{
return get() != _data.get();
}
/// Allows to compare pointer address
constexpr bool operator==(const DATATYPE* _data) const noexcept
{
return get() == _data;
}
/// Allows to compare pointer address
constexpr bool operator!=(const DATATYPE* _data) const noexcept
{
return get() != _data;
}
private:
/// Data to guard
std::shared_ptr<DATATYPE> m_data;
/// Read lock if the data is const, write lock otherwise
lock m_locker;
std::vector<core::memory::buffer_object::lock_t> m_dump_locks;
};
} // namespace sight::data::mt
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