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/*************************************************************************/
/* reference.h */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* http://www.godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2017 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. */
/*************************************************************************/
#ifndef REFERENCE_H
#define REFERENCE_H
#include "object.h"
#include "safe_refcount.h"
#include "ref_ptr.h"
#include "object_type_db.h"
/**
@author Juan Linietsky <reduzio@gmail.com>
*/
class Reference : public Object{
OBJ_TYPE( Reference, Object );
friend class RefBase;
SafeRefCount refcount;
SafeRefCount refcount_init;
protected:
static void _bind_methods();
public:
_FORCE_INLINE_ bool is_referenced() const { return refcount_init.get()<1; }
bool init_ref();
void reference();
bool unreference();
int reference_get_count() const;
Reference();
~Reference();
};
#if 0
class RefBase {
protected:
void ref_inc(Reference *p_reference);
bool ref_dec(Reference *p_reference);
Reference *first_ref(Reference *p_reference);
Reference * get_reference_from_ref(const RefBase &p_base);
virtual Reference * get_reference() const=0;
char * get_refptr_data(const RefPtr &p_refptr) const;
public:
virtual ~RefBase() {}
};
#endif
template<class T>
class Ref {
T *reference;
void ref( const Ref& p_from ) {
if (p_from.reference==reference)
return;
unref();
reference=p_from.reference;
if (reference)
reference->reference();
}
void ref_pointer( T* p_ref ) {
ERR_FAIL_COND(!p_ref);
if (p_ref->init_ref())
reference=p_ref;
}
//virtual Reference * get_reference() const { return reference; }
public:
_FORCE_INLINE_ bool operator<(const Ref<T>& p_r) const {
return reference<p_r.reference;
}
_FORCE_INLINE_ bool operator==(const Ref<T>& p_r) const {
return reference==p_r.reference;
}
_FORCE_INLINE_ bool operator!=(const Ref<T>& p_r) const {
return reference!=p_r.reference;
}
_FORCE_INLINE_ T* operator->() {
return reference;
}
_FORCE_INLINE_ T* operator*() {
return reference;
}
_FORCE_INLINE_ const T* operator->() const {
return reference;
}
_FORCE_INLINE_ const T* ptr() const {
return reference;
}
_FORCE_INLINE_ T* ptr() {
return reference;
}
_FORCE_INLINE_ const T* operator*() const {
return reference;
}
RefPtr get_ref_ptr() const {
RefPtr refptr;
Ref<Reference> * irr = reinterpret_cast<Ref<Reference>*>( refptr.get_data() );
*irr = *this;
return refptr;
};
#if 0
// go to RefPtr
operator RefPtr() const {
return get_ref_ptr();
}
#endif
#if 1
operator Variant() const {
return Variant( get_ref_ptr() );
}
#endif
void operator=( const Ref& p_from ) {
ref(p_from);
}
template<class T_Other>
void operator=( const Ref<T_Other>& p_from ) {
Reference *refb = const_cast<Reference*>(static_cast<const Reference*>(p_from.ptr()));
if (!refb) {
unref();
return;
}
Ref r;
r.reference=refb->cast_to<T>();
ref(r);
r.reference=NULL;
}
void operator=( const RefPtr& p_refptr ) {
Ref<Reference> * irr = reinterpret_cast<Ref<Reference>*>( p_refptr.get_data() );
Reference *refb = irr->ptr();
if (!refb) {
unref();
return;
}
Ref r;
r.reference=refb->cast_to<T>();
ref(r);
r.reference=NULL;
}
void operator=( const Variant& p_variant ) {
RefPtr refptr=p_variant;
Ref<Reference> * irr = reinterpret_cast<Ref<Reference>*>( refptr.get_data() );
Reference *refb = irr->ptr();
if (!refb) {
unref();
return;
}
Ref r;
r.reference=refb->cast_to<T>();
ref(r);
r.reference=NULL;
}
Ref( const Ref& p_from ) {
reference=NULL;
ref(p_from);
}
template<class T_Other>
Ref( const Ref<T_Other>& p_from ) {
reference=NULL;
Reference *refb = const_cast<Reference*>(static_cast<const Reference*>(p_from.ptr()));
if (!refb) {
unref();
return;
}
Ref r;
r.reference=refb->cast_to<T>();
ref(r);
r.reference=NULL;
}
Ref( T* p_reference ) {
if (p_reference)
ref_pointer(p_reference);
else
reference=NULL;
}
Ref( const Variant& p_variant) {
RefPtr refptr=p_variant;
Ref<Reference> * irr = reinterpret_cast<Ref<Reference>*>( refptr.get_data() );
reference=NULL;
Reference *refb = irr->ptr();
if (!refb) {
unref();
return;
}
Ref r;
r.reference=refb->cast_to<T>();
ref(r);
r.reference=NULL;
}
Ref( const RefPtr& p_refptr) {
Ref<Reference> * irr = reinterpret_cast<Ref<Reference>*>( p_refptr.get_data() );
reference=NULL;
Reference *refb = irr->ptr();
if (!refb) {
unref();
return;
}
Ref r;
r.reference=refb->cast_to<T>();
ref(r);
r.reference=NULL;
}
inline bool is_valid() const { return reference!=NULL; }
inline bool is_null() const { return reference==NULL; }
void unref() {
//TODO this should be moved to mutexes, since this engine does not really
// do a lot of referencing on references and stuff
// mutexes will avoid more crashes?
if (reference && reference->unreference()) {
memdelete(reference);
}
reference=NULL;
}
void instance() {
ref( memnew( T ));
}
Ref() {
reference=NULL;
}
~Ref() {
unref();
}
};
typedef Ref<Reference> REF;
class WeakRef : public Reference {
OBJ_TYPE(WeakRef,Reference);
ObjectID ref;
protected:
static void _bind_methods();
public:
Variant get_ref() const;
void set_obj(Object *p_object);
void set_ref(const REF& p_ref);
WeakRef();
};
#ifdef PTRCALL_ENABLED
template<class T>
struct PtrToArg< Ref<T> > {
_FORCE_INLINE_ static Ref<T> convert(const void* p_ptr) {
return Ref<T>(reinterpret_cast<const T*>(p_ptr));
}
_FORCE_INLINE_ static void encode(Ref<T> p_val,const void* p_ptr) {
*(Ref<Reference>*)p_ptr=p_val;
}
};
template<class T>
struct PtrToArg< const Ref<T>& > {
_FORCE_INLINE_ static Ref<T> convert(const void* p_ptr) {
return Ref<T>(reinterpret_cast<const T*>(p_ptr));
}
};
//this is for RefPtr
template<>
struct PtrToArg< RefPtr > {
_FORCE_INLINE_ static RefPtr convert(const void* p_ptr) {
return Ref<Reference>(reinterpret_cast<const Reference*>(p_ptr)).get_ref_ptr();
}
_FORCE_INLINE_ static void encode(RefPtr p_val,const void* p_ptr) {
Ref<Reference> r = p_val;
*(Ref<Reference>*)p_ptr=r;
}
};
template<>
struct PtrToArg< const RefPtr& > {
_FORCE_INLINE_ static RefPtr convert(const void* p_ptr) {
return Ref<Reference>(reinterpret_cast<const Reference*>(p_ptr)).get_ref_ptr();
}
};
#endif
#endif // REFERENCE_H
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