111 lines
3.2 KiB
Plaintext
111 lines
3.2 KiB
Plaintext
//C++ header - Open Scene Graph - Copyright (C) 1998-2002 Robert Osfield
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//Distributed under the terms of the GNU Library General Public License (LGPL)
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//as published by the Free Software Foundation.
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#ifndef OSG_REF_PTR
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#define OSG_REF_PTR 1
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namespace osg {
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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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ref_ptr() :_ptr(0L) {}
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ref_ptr(T* t):_ptr(t) { 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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~ref_ptr() { if (_ptr) _ptr->unref(); }
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inline ref_ptr& operator = (const ref_ptr& rp)
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{
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if (_ptr==rp._ptr) return *this;
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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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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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inline const bool operator == (const ref_ptr& rp) const
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{
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return (_ptr==rp._ptr);
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}
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inline const bool operator == (const T* ptr) const
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{
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return (_ptr==ptr);
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}
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inline const bool operator != (const ref_ptr& rp) const
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{
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return (_ptr!=rp._ptr);
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}
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inline const bool operator != (const T* ptr) const
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{
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return (_ptr!=ptr);
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}
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inline const bool operator < (const ref_ptr& rp) const
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{
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return (_ptr<rp._ptr);
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}
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inline const bool operator > (const ref_ptr& rp) const
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{
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return (_ptr>rp._ptr);
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}
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inline const bool operator > (const T* ptr) const
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{
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return (_ptr>ptr);
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}
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inline T& operator*() { return *_ptr; }
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inline const T& operator*() const { return *_ptr; }
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inline T* operator->() { return _ptr; }
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inline const T* operator->() const { return _ptr; }
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inline const bool operator!() const { return _ptr==0L; }
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inline const bool valid() const { return _ptr!=0L; }
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inline T* get() { return _ptr; }
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inline const T* get() const { return _ptr; }
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/** take control over the object pointed to by ref_ptr, unreference but do not delete even if ref count goes to 0,
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* return the pointer to the object.
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* Note, do not use this unless you are 100% sure your code handles the deletion of the object correctly, and
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* only use when absolutely required.*/
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inline T* take() { T* tmp=_ptr; if (_ptr) _ptr->unref_nodelete(); _ptr=0; return tmp;}
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private:
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T* _ptr;
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};
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}
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#endif
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