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/*
* 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
#include <atomic>
#include <string>
#include "BLI_hash.hh"
#include "BLI_string_ref.hh"
#include "BKE_anonymous_attribute.h"
namespace blender::bke {
/**
* Wrapper for #AnonymousAttributeID with RAII semantics.
* This class should typically not be used directly. Instead use #StrongAnonymousAttributeID or
* #WeakAnonymousAttributeID.
*/
template<bool IsStrongReference> class OwnedAnonymousAttributeID {
private:
const AnonymousAttributeID *data_ = nullptr;
template<bool OtherIsStrongReference> friend class OwnedAnonymousAttributeID;
public:
OwnedAnonymousAttributeID() = default;
/** Create a new anonymous attribute id. */
explicit OwnedAnonymousAttributeID(StringRefNull debug_name)
{
if constexpr (IsStrongReference) {
data_ = BKE_anonymous_attribute_id_new_strong(debug_name.c_str());
}
else {
data_ = BKE_anonymous_attribute_id_new_weak(debug_name.c_str());
}
}
/**
* This transfers ownership, so no incref is necessary.
* The caller has to make sure that it owned the anonymous id.
*/
explicit OwnedAnonymousAttributeID(const AnonymousAttributeID *anonymous_id)
: data_(anonymous_id)
{
}
template<bool OtherIsStrong>
OwnedAnonymousAttributeID(const OwnedAnonymousAttributeID<OtherIsStrong> &other)
{
data_ = other.data_;
this->incref();
}
template<bool OtherIsStrong>
OwnedAnonymousAttributeID(OwnedAnonymousAttributeID<OtherIsStrong> &&other)
{
data_ = other.data_;
this->incref();
other.decref();
other.data_ = nullptr;
}
~OwnedAnonymousAttributeID()
{
this->decref();
}
template<bool OtherIsStrong>
OwnedAnonymousAttributeID &operator=(const OwnedAnonymousAttributeID<OtherIsStrong> &other)
{
if (this == &other) {
return *this;
}
this->~OwnedAnonymousAttributeID();
new (this) OwnedAnonymousAttributeID(other);
return *this;
}
template<bool OtherIsStrong>
OwnedAnonymousAttributeID &operator=(OwnedAnonymousAttributeID<OtherIsStrong> &&other)
{
if (this == &other) {
return *this;
}
this->~OwnedAnonymousAttributeID();
new (this) OwnedAnonymousAttributeID(std::move(other));
return *this;
}
operator bool() const
{
return data_ != nullptr;
}
StringRefNull debug_name() const
{
BLI_assert(data_ != nullptr);
return BKE_anonymous_attribute_id_debug_name(data_);
}
bool has_strong_references() const
{
BLI_assert(data_ != nullptr);
return BKE_anonymous_attribute_id_has_strong_references(data_);
}
/** Extract the ownership of the currently wrapped anonymous id. */
const AnonymousAttributeID *extract()
{
const AnonymousAttributeID *extracted_data = data_;
/* Don't decref because the caller becomes the new owner. */
data_ = nullptr;
return extracted_data;
}
/** Get the wrapped anonymous id, without taking ownership. */
const AnonymousAttributeID *get() const
{
return data_;
}
private:
void incref()
{
if (data_ == nullptr) {
return;
}
if constexpr (IsStrongReference) {
BKE_anonymous_attribute_id_increment_strong(data_);
}
else {
BKE_anonymous_attribute_id_increment_weak(data_);
}
}
void decref()
{
if (data_ == nullptr) {
return;
}
if constexpr (IsStrongReference) {
BKE_anonymous_attribute_id_decrement_strong(data_);
}
else {
BKE_anonymous_attribute_id_decrement_weak(data_);
}
}
};
using StrongAnonymousAttributeID = OwnedAnonymousAttributeID<true>;
using WeakAnonymousAttributeID = OwnedAnonymousAttributeID<false>;
} // namespace blender::bke
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