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138 lines
4.6 KiB
138 lines
4.6 KiB
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield |
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* |
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* This library is open source and may be redistributed and/or modified under |
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or |
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* (at your option) any later version. The full license is in LICENSE file |
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* included with this distribution, and on the openscenegraph.org website. |
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* |
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* This library is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* OpenSceneGraph Public License for more details. |
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*/ |
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#ifndef OSG_REF_PTR |
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#define OSG_REF_PTR 1 |
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#include <osg/Config> |
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namespace osg { |
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template<typename T> class observer_ptr; |
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/** Smart pointer for handling referenced counted objects.*/ |
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template<class T> |
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class ref_ptr |
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{ |
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public: |
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typedef T element_type; |
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ref_ptr() : _ptr(0) {} |
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ref_ptr(T* ptr) : _ptr(ptr) { if (_ptr) _ptr->ref(); } |
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ref_ptr(const ref_ptr& rp) : _ptr(rp._ptr) { if (_ptr) _ptr->ref(); } |
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template<class Other> ref_ptr(const ref_ptr<Other>& rp) : _ptr(rp._ptr) { if (_ptr) _ptr->ref(); } |
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ref_ptr(observer_ptr<T>& optr) : _ptr(0) { optr.lock(*this); } |
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~ref_ptr() { if (_ptr) _ptr->unref(); _ptr = 0; } |
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ref_ptr& operator = (const ref_ptr& rp) |
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{ |
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assign(rp); |
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return *this; |
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} |
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template<class Other> ref_ptr& operator = (const ref_ptr<Other>& rp) |
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{ |
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assign(rp); |
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return *this; |
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} |
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inline ref_ptr& operator = (T* ptr) |
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{ |
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if (_ptr==ptr) return *this; |
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T* tmp_ptr = _ptr; |
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_ptr = ptr; |
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if (_ptr) _ptr->ref(); |
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// unref second to prevent any deletion of any object which might |
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// be referenced by the other object. i.e rp is child of the |
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// original _ptr. |
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if (tmp_ptr) tmp_ptr->unref(); |
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return *this; |
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} |
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#ifdef OSG_USE_REF_PTR_IMPLICIT_OUTPUT_CONVERSION |
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// implicit output conversion |
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operator T*() const { return _ptr; } |
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#else |
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// comparison operators for ref_ptr. |
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bool operator == (const ref_ptr& rp) const { return (_ptr==rp._ptr); } |
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bool operator == (const T* ptr) const { return (_ptr==ptr); } |
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friend bool operator == (const T* ptr, const ref_ptr& rp) { return (ptr==rp._ptr); } |
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bool operator != (const ref_ptr& rp) const { return (_ptr!=rp._ptr); } |
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bool operator != (const T* ptr) const { return (_ptr!=ptr); } |
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friend bool operator != (const T* ptr, const ref_ptr& rp) { return (ptr!=rp._ptr); } |
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bool operator < (const ref_ptr& rp) const { return (_ptr<rp._ptr); } |
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// follows is an implmentation of the "safe bool idiom", details can be found at: |
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// http://en.wikibooks.org/wiki/More_C%2B%2B_Idioms/Safe_bool |
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// http://lists.boost.org/Archives/boost/2003/09/52856.php |
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private: |
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typedef T* ref_ptr::*unspecified_bool_type; |
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public: |
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// safe bool conversion |
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operator unspecified_bool_type() const { return valid()? &ref_ptr::_ptr : 0; } |
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#endif |
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T& operator*() const { return *_ptr; } |
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T* operator->() const { return _ptr; } |
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T* get() const { return _ptr; } |
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bool operator!() const { return _ptr==0; } // not required |
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bool valid() const { return _ptr!=0; } |
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T* release() { T* tmp=_ptr; if (_ptr) _ptr->unref_nodelete(); _ptr=0; return tmp; } |
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void swap(ref_ptr& rp) { T* tmp=_ptr; _ptr=rp._ptr; rp._ptr=tmp; } |
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private: |
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template<class Other> void assign(const ref_ptr<Other>& rp) |
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{ |
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if (_ptr==rp._ptr) return; |
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T* tmp_ptr = _ptr; |
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_ptr = rp._ptr; |
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if (_ptr) _ptr->ref(); |
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// unref second to prevent any deletion of any object which might |
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// be referenced by the other object. i.e rp is child of the |
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// original _ptr. |
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if (tmp_ptr) tmp_ptr->unref(); |
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} |
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template<class Other> friend class ref_ptr; |
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T* _ptr; |
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}; |
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template<class T> inline |
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void swap(ref_ptr<T>& rp1, ref_ptr<T>& rp2) { rp1.swap(rp2); } |
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template<class T> inline |
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T* get_pointer(const ref_ptr<T>& rp) { return rp.get(); } |
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template<class T, class Y> inline |
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ref_ptr<T> static_pointer_cast(const ref_ptr<Y>& rp) { return static_cast<T*>(rp.get()); } |
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template<class T, class Y> inline |
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ref_ptr<T> dynamic_pointer_cast(const ref_ptr<Y>& rp) { return dynamic_cast<T*>(rp.get()); } |
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template<class T, class Y> inline |
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ref_ptr<T> const_pointer_cast(const ref_ptr<Y>& rp) { return const_cast<T*>(rp.get()); } |
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} |
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#endif
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