e955c94ed3
Listing the "Blender Foundation" as copyright holder implied the Blender Foundation holds copyright to files which may include work from many developers. While keeping copyright on headers makes sense for isolated libraries, Blender's own code may be refactored or moved between files in a way that makes the per file copyright holders less meaningful. Copyright references to the "Blender Foundation" have been replaced with "Blender Authors", with the exception of `./extern/` since these this contains libraries which are more isolated, any changed to license headers there can be handled on a case-by-case basis. Some directories in `./intern/` have also been excluded: - `./intern/cycles/` it's own `AUTHORS` file is planned. - `./intern/opensubdiv/`. An "AUTHORS" file has been added, using the chromium projects authors file as a template. Design task: #110784 Ref !110783.
152 lines
2.6 KiB
C++
152 lines
2.6 KiB
C++
/* SPDX-FileCopyrightText: 2023 Blender Authors
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
|
|
#pragma once
|
|
|
|
/** \file
|
|
* \ingroup bli
|
|
*/
|
|
|
|
#include "BLI_implicit_sharing.hh"
|
|
|
|
namespace blender {
|
|
|
|
/**
|
|
* #ImplicitSharingPtr is a smart pointer that manages implicit sharing. It's designed to work with
|
|
* types that derive from #ImplicitSharingMixin. It is fairly similar to #std::shared_ptr but
|
|
* requires the reference count to be embedded in the data.
|
|
*/
|
|
template<typename T> class ImplicitSharingPtr {
|
|
private:
|
|
T *data_ = nullptr;
|
|
|
|
public:
|
|
ImplicitSharingPtr() = default;
|
|
|
|
ImplicitSharingPtr(T *data) : data_(data) {}
|
|
|
|
ImplicitSharingPtr(const ImplicitSharingPtr &other) : data_(other.data_)
|
|
{
|
|
this->add_user(data_);
|
|
}
|
|
|
|
ImplicitSharingPtr(ImplicitSharingPtr &&other) : data_(other.data_)
|
|
{
|
|
other.data_ = nullptr;
|
|
}
|
|
|
|
~ImplicitSharingPtr()
|
|
{
|
|
this->remove_user_and_delete_if_last(data_);
|
|
}
|
|
|
|
ImplicitSharingPtr &operator=(const ImplicitSharingPtr &other)
|
|
{
|
|
if (this == &other) {
|
|
return *this;
|
|
}
|
|
|
|
this->remove_user_and_delete_if_last(data_);
|
|
data_ = other.data_;
|
|
this->add_user(data_);
|
|
return *this;
|
|
}
|
|
|
|
ImplicitSharingPtr &operator=(ImplicitSharingPtr &&other)
|
|
{
|
|
if (this == &other) {
|
|
return *this;
|
|
}
|
|
|
|
this->remove_user_and_delete_if_last(data_);
|
|
data_ = other.data_;
|
|
other.data_ = nullptr;
|
|
return *this;
|
|
}
|
|
|
|
T *operator->()
|
|
{
|
|
BLI_assert(data_ != nullptr);
|
|
return data_;
|
|
}
|
|
|
|
const T *operator->() const
|
|
{
|
|
BLI_assert(data_ != nullptr);
|
|
return data_;
|
|
}
|
|
|
|
T &operator*()
|
|
{
|
|
BLI_assert(data_ != nullptr);
|
|
return *data_;
|
|
}
|
|
|
|
const T &operator*() const
|
|
{
|
|
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->remove_user_and_delete_if_last(data_);
|
|
data_ = nullptr;
|
|
}
|
|
|
|
bool has_value() const
|
|
{
|
|
return data_ != nullptr;
|
|
}
|
|
|
|
uint64_t hash() const
|
|
{
|
|
return get_default_hash(data_);
|
|
}
|
|
|
|
friend bool operator==(const ImplicitSharingPtr &a, const ImplicitSharingPtr &b)
|
|
{
|
|
return a.data_ == b.data_;
|
|
}
|
|
|
|
private:
|
|
static void add_user(T *data)
|
|
{
|
|
if (data != nullptr) {
|
|
data->add_user();
|
|
}
|
|
}
|
|
|
|
static void remove_user_and_delete_if_last(T *data)
|
|
{
|
|
if (data != nullptr) {
|
|
data->remove_user_and_delete_if_last();
|
|
}
|
|
}
|
|
};
|
|
|
|
} // namespace blender
|