159 lines
2.8 KiB
C++
159 lines
2.8 KiB
C++
/*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This program 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 this program; if not, write to the Free Software Foundation,
|
|
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
/** \file
|
|
* \ingroup bli
|
|
*/
|
|
|
|
#include <atomic>
|
|
|
|
namespace blender {
|
|
|
|
/**
|
|
* A simple automatic reference counter. It is similar to std::shared_ptr, but expects that the
|
|
* reference count is inside the object.
|
|
*/
|
|
template<typename T> class UserCounter {
|
|
private:
|
|
T *data_ = nullptr;
|
|
|
|
public:
|
|
UserCounter() = default;
|
|
|
|
UserCounter(T *data) : data_(data)
|
|
{
|
|
}
|
|
|
|
UserCounter(const UserCounter &other) : data_(other.data_)
|
|
{
|
|
this->user_add(data_);
|
|
}
|
|
|
|
UserCounter(UserCounter &&other) : data_(other.data_)
|
|
{
|
|
other.data_ = nullptr;
|
|
}
|
|
|
|
~UserCounter()
|
|
{
|
|
this->user_remove(data_);
|
|
}
|
|
|
|
UserCounter &operator=(const UserCounter &other)
|
|
{
|
|
if (this == &other) {
|
|
return *this;
|
|
}
|
|
|
|
this->user_remove(data_);
|
|
data_ = other.data_;
|
|
this->user_add(data_);
|
|
return *this;
|
|
}
|
|
|
|
UserCounter &operator=(UserCounter &&other)
|
|
{
|
|
if (this == &other) {
|
|
return *this;
|
|
}
|
|
|
|
this->user_remove(data_);
|
|
data_ = other.data_;
|
|
other.data_ = nullptr;
|
|
return *this;
|
|
}
|
|
|
|
T *operator->()
|
|
{
|
|
BLI_assert(data_ != nullptr);
|
|
return data_;
|
|
}
|
|
|
|
T &operator*()
|
|
{
|
|
BLI_assert(data_ != nullptr);
|
|
return *data_;
|
|
}
|
|
|
|
operator bool() const
|
|
{
|
|
return data_ != nullptr;
|
|
}
|
|
|
|
T *get()
|
|
{
|
|
return data_;
|
|
}
|
|
|
|
const T *get() const
|
|
{
|
|
return data_;
|
|
}
|
|
|
|
T *release()
|
|
{
|
|
T *data = data_;
|
|
data_ = nullptr;
|
|
return data;
|
|
}
|
|
|
|
void reset()
|
|
{
|
|
this->user_remove(data_);
|
|
data_ = nullptr;
|
|
}
|
|
|
|
bool has_value() const
|
|
{
|
|
return data_ != nullptr;
|
|
}
|
|
|
|
uint64_t hash() const
|
|
{
|
|
return DefaultHash<T *>{}(data_);
|
|
}
|
|
|
|
friend bool operator==(const UserCounter &a, const UserCounter &b)
|
|
{
|
|
return a.data_ == b.data_;
|
|
}
|
|
|
|
friend std::ostream &operator<<(std::ostream &stream, const UserCounter &value)
|
|
{
|
|
stream << value.data_;
|
|
return stream;
|
|
}
|
|
|
|
private:
|
|
static void user_add(T *data)
|
|
{
|
|
if (data != nullptr) {
|
|
data->user_add();
|
|
}
|
|
}
|
|
|
|
static void user_remove(T *data)
|
|
{
|
|
if (data != nullptr) {
|
|
data->user_remove();
|
|
}
|
|
}
|
|
};
|
|
|
|
} // namespace blender
|