godot/core/object/ref_counted.cpp

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/**************************************************************************/
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/* ref_counted.cpp */
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/**************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/**************************************************************************/
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#include "ref_counted.h"
#include "core/object/script_language.h"
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bool RefCounted::init_ref() {
if (reference()) {
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if (!is_referenced() && refcount_init.unref()) {
unreference(); // first referencing is already 1, so compensate for the ref above
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}
return true;
} else {
return false;
}
}
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void RefCounted::_bind_methods() {
ClassDB::bind_method(D_METHOD("init_ref"), &RefCounted::init_ref);
ClassDB::bind_method(D_METHOD("reference"), &RefCounted::reference);
ClassDB::bind_method(D_METHOD("unreference"), &RefCounted::unreference);
ClassDB::bind_method(D_METHOD("get_reference_count"), &RefCounted::get_reference_count);
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}
int RefCounted::get_reference_count() const {
return refcount.get();
}
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bool RefCounted::reference() {
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uint32_t rc_val = refcount.refval();
bool success = rc_val != 0;
if (success && rc_val <= 2 /* higher is not relevant */) {
if (get_script_instance()) {
get_script_instance()->refcount_incremented();
}
if (_get_extension() && _get_extension()->reference) {
_get_extension()->reference(_get_extension_instance());
}
_instance_binding_reference(true);
}
return success;
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}
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bool RefCounted::unreference() {
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uint32_t rc_val = refcount.unrefval();
bool die = rc_val == 0;
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if (rc_val <= 1 /* higher is not relevant */) {
if (get_script_instance()) {
bool script_ret = get_script_instance()->refcount_decremented();
die = die && script_ret;
}
if (_get_extension() && _get_extension()->unreference) {
_get_extension()->unreference(_get_extension_instance());
}
bool binding_ret = _instance_binding_reference(false);
die = die && binding_ret;
}
return die;
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}
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RefCounted::RefCounted() :
Object(true) {
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refcount.init();
refcount_init.init();
}
Variant WeakRef::get_ref() const {
if (ref.is_null()) {
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return Variant();
}
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Object *obj = ObjectDB::get_instance(ref);
if (!obj) {
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return Variant();
}
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RefCounted *r = cast_to<RefCounted>(obj);
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if (r) {
return Ref<RefCounted>(r);
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}
return obj;
}
void WeakRef::set_obj(Object *p_object) {
ref = p_object ? p_object->get_instance_id() : ObjectID();
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}
void WeakRef::set_ref(const Ref<RefCounted> &p_ref) {
ref = p_ref.is_valid() ? p_ref->get_instance_id() : ObjectID();
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}
void WeakRef::_bind_methods() {
ClassDB::bind_method(D_METHOD("get_ref"), &WeakRef::get_ref);
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}