336 lines
7.5 KiB
C++
336 lines
7.5 KiB
C++
/*************************************************************************/
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/* reference.h */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md). */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#ifndef REFERENCE_H
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#define REFERENCE_H
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#include "core/class_db.h"
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#include "core/object.h"
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#include "core/safe_refcount.h"
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class Reference : public Object {
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GDCLASS(Reference, Object);
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SafeRefCount refcount;
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SafeRefCount refcount_init;
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protected:
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static void _bind_methods();
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public:
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_FORCE_INLINE_ bool is_referenced() const { return refcount_init.get() != 1; }
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bool init_ref();
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bool reference(); // returns false if refcount is at zero and didn't get increased
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bool unreference();
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int reference_get_count() const;
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Reference();
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~Reference();
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};
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template <class T>
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class Ref {
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T *reference;
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void ref(const Ref &p_from) {
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if (p_from.reference == reference)
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return;
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unref();
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reference = p_from.reference;
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if (reference)
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reference->reference();
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}
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void ref_pointer(T *p_ref) {
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ERR_FAIL_COND(!p_ref);
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if (p_ref->init_ref())
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reference = p_ref;
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}
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//virtual Reference * get_reference() const { return reference; }
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public:
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_FORCE_INLINE_ bool operator==(const T *p_ptr) const {
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return reference == p_ptr;
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}
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_FORCE_INLINE_ bool operator!=(const T *p_ptr) const {
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return reference != p_ptr;
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}
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_FORCE_INLINE_ bool operator<(const Ref<T> &p_r) const {
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return reference < p_r.reference;
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}
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_FORCE_INLINE_ bool operator==(const Ref<T> &p_r) const {
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return reference == p_r.reference;
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}
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_FORCE_INLINE_ bool operator!=(const Ref<T> &p_r) const {
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return reference != p_r.reference;
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}
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_FORCE_INLINE_ T *operator->() {
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return reference;
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}
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_FORCE_INLINE_ T *operator*() {
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return reference;
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}
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_FORCE_INLINE_ const T *operator->() const {
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return reference;
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}
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_FORCE_INLINE_ const T *ptr() const {
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return reference;
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}
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_FORCE_INLINE_ T *ptr() {
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return reference;
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}
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_FORCE_INLINE_ const T *operator*() const {
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return reference;
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}
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operator Variant() const {
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return Variant(reference);
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}
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void operator=(const Ref &p_from) {
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ref(p_from);
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}
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template <class T_Other>
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void operator=(const Ref<T_Other> &p_from) {
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Reference *refb = const_cast<Reference *>(static_cast<const Reference *>(p_from.ptr()));
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if (!refb) {
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unref();
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return;
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}
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Ref r;
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r.reference = Object::cast_to<T>(refb);
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ref(r);
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r.reference = nullptr;
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}
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void operator=(const Variant &p_variant) {
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Object *object = p_variant.get_validated_object();
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if (object == reference) {
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return;
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}
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unref();
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if (!object) {
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return;
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}
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T *r = Object::cast_to<T>(object);
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if (r && r->reference()) {
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reference = r;
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}
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}
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template <class T_Other>
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void reference_ptr(T_Other *p_ptr) {
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if (reference == p_ptr) {
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return;
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}
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unref();
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T *r = Object::cast_to<T>(p_ptr);
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if (r) {
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ref_pointer(r);
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}
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}
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Ref(const Ref &p_from) {
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reference = nullptr;
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ref(p_from);
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}
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template <class T_Other>
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Ref(const Ref<T_Other> &p_from) {
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reference = nullptr;
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Reference *refb = const_cast<Reference *>(static_cast<const Reference *>(p_from.ptr()));
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if (!refb) {
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unref();
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return;
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}
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Ref r;
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r.reference = Object::cast_to<T>(refb);
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ref(r);
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r.reference = nullptr;
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}
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Ref(T *p_reference) {
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reference = nullptr;
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if (p_reference)
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ref_pointer(p_reference);
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}
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Ref(const Variant &p_variant) {
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Object *object = p_variant.get_validated_object();
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if (!object) {
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reference = nullptr;
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return;
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}
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T *r = Object::cast_to<T>(object);
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if (r && r->reference()) {
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reference = r;
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} else {
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reference = nullptr;
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}
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}
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inline bool is_valid() const { return reference != nullptr; }
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inline bool is_null() const { return reference == nullptr; }
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void unref() {
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//TODO this should be moved to mutexes, since this engine does not really
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// do a lot of referencing on references and stuff
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// mutexes will avoid more crashes?
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if (reference && reference->unreference()) {
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memdelete(reference);
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}
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reference = nullptr;
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}
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void instance() {
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ref(memnew(T));
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}
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Ref() {
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reference = nullptr;
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}
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~Ref() {
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unref();
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}
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};
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typedef Ref<Reference> REF;
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class WeakRef : public Reference {
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GDCLASS(WeakRef, Reference);
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ObjectID ref;
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protected:
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static void _bind_methods();
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public:
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Variant get_ref() const;
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void set_obj(Object *p_object);
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void set_ref(const REF &p_ref);
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WeakRef();
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};
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#ifdef PTRCALL_ENABLED
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template <class T>
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struct PtrToArg<Ref<T>> {
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_FORCE_INLINE_ static Ref<T> convert(const void *p_ptr) {
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return Ref<T>(const_cast<T *>(reinterpret_cast<const T *>(p_ptr)));
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}
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_FORCE_INLINE_ static void encode(Ref<T> p_val, const void *p_ptr) {
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*(Ref<Reference> *)p_ptr = p_val;
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}
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};
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template <class T>
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struct PtrToArg<const Ref<T> &> {
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_FORCE_INLINE_ static Ref<T> convert(const void *p_ptr) {
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return Ref<T>((T *)p_ptr);
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}
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};
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#endif // PTRCALL_ENABLED
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#ifdef DEBUG_METHODS_ENABLED
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template <class T>
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struct GetTypeInfo<Ref<T>> {
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static const Variant::Type VARIANT_TYPE = Variant::OBJECT;
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static const GodotTypeInfo::Metadata METADATA = GodotTypeInfo::METADATA_NONE;
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static inline PropertyInfo get_class_info() {
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return PropertyInfo(Variant::OBJECT, String(), PROPERTY_HINT_RESOURCE_TYPE, T::get_class_static());
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}
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};
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template <class T>
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struct GetTypeInfo<const Ref<T> &> {
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static const Variant::Type VARIANT_TYPE = Variant::OBJECT;
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static const GodotTypeInfo::Metadata METADATA = GodotTypeInfo::METADATA_NONE;
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static inline PropertyInfo get_class_info() {
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return PropertyInfo(Variant::OBJECT, String(), PROPERTY_HINT_RESOURCE_TYPE, T::get_class_static());
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}
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};
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#endif // DEBUG_METHODS_ENABLED
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#endif // REFERENCE_H
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