150 lines
2.5 KiB
C++
150 lines
2.5 KiB
C++
/* SPDX-FileCopyrightText: 2023 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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#pragma once
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/** \file
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* \ingroup bli
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*/
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#include "BLI_implicit_sharing.hh"
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#include "BLI_struct_equality_utils.hh"
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namespace blender {
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/**
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* #ImplicitSharingPtr is a smart pointer that manages implicit sharing. It's designed to work with
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* types that derive from #ImplicitSharingMixin. It is fairly similar to #std::shared_ptr but
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* requires the reference count to be embedded in the data.
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*/
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template<typename T> class ImplicitSharingPtr {
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private:
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T *data_ = nullptr;
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public:
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ImplicitSharingPtr() = default;
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ImplicitSharingPtr(T *data) : data_(data) {}
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ImplicitSharingPtr(const ImplicitSharingPtr &other) : data_(other.data_)
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{
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this->add_user(data_);
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}
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ImplicitSharingPtr(ImplicitSharingPtr &&other) : data_(other.data_)
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{
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other.data_ = nullptr;
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}
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~ImplicitSharingPtr()
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{
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this->remove_user_and_delete_if_last(data_);
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}
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ImplicitSharingPtr &operator=(const ImplicitSharingPtr &other)
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{
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if (this == &other) {
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return *this;
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}
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this->remove_user_and_delete_if_last(data_);
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data_ = other.data_;
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this->add_user(data_);
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return *this;
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}
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ImplicitSharingPtr &operator=(ImplicitSharingPtr &&other)
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{
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if (this == &other) {
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return *this;
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}
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this->remove_user_and_delete_if_last(data_);
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data_ = other.data_;
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other.data_ = nullptr;
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return *this;
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}
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T *operator->()
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{
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BLI_assert(data_ != nullptr);
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return data_;
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}
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const T *operator->() const
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{
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BLI_assert(data_ != nullptr);
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return data_;
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}
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T &operator*()
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{
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BLI_assert(data_ != nullptr);
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return *data_;
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}
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const T &operator*() const
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{
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BLI_assert(data_ != nullptr);
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return *data_;
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}
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operator bool() const
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{
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return data_ != nullptr;
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}
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T *get()
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{
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return data_;
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}
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const T *get() const
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{
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return data_;
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}
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T *release()
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{
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T *data = data_;
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data_ = nullptr;
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return data;
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}
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void reset()
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{
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this->remove_user_and_delete_if_last(data_);
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data_ = nullptr;
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}
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bool has_value() const
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{
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return data_ != nullptr;
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}
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uint64_t hash() const
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{
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return get_default_hash(data_);
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}
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BLI_STRUCT_EQUALITY_OPERATORS_1(ImplicitSharingPtr, data_)
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private:
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static void add_user(T *data)
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{
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if (data != nullptr) {
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data->add_user();
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}
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}
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static void remove_user_and_delete_if_last(T *data)
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{
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if (data != nullptr) {
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data->remove_user_and_delete_if_last();
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}
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}
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};
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} // namespace blender
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