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Sunday the 5th of February 2012 @ 04:56pm

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LibN2L N2L Home Older News Downloads Documentation (n2l5) Class Hierarchy Compound List File List n2l:: Members Functions Whole n2l:: Ref Documentation (libN2L-4) Class Hierarchy Compound List File List n2l:: Members Functions Whole n2l:: Ref Bugtracker Project Page Report a Bug Bug List Related Things Life 2130 Devel Game Journal

LibN2L-4 Library Code Reference Classes Compounds Files Members Method Index Full Reference cAutoPtr.h Go to the documentation of this file. /************************************************************************ Nova-2 Library (libN2L, or simply n2l) Game development C++ Library Copyright (C) 2003 Aaron Cameron This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA A copy of the GNU Lesser General Public License has been provided with this library in the file 'COPYING'. Contact information for the author of this library has been provided with this library in the file 'AUTHOR'. ************************************************************************/ #ifndef _n2l4_cAutoPtr_h #define _n2l4_cAutoPtr_h #include "types.h" #include "cBadCastException.h" #include "assert.h" /******************************************************************************/ namespace n2l { template <class TPtr> class cAutoPtr { private: typedef tUint tRefCount; typedef TPtr tValue; tRefCount * mRefCount; tValue * mPtr; void incRefCount() const { assert(mRefCount); (*mRefCount)++; } void decRefCount() const { assert(mRefCount); assert(*mRefCount); (*mRefCount)--; } void set( tValue * const i_ioPtr ) { mPtr = i_ioPtr; } tValue * const get() const { return mPtr; } protected: public: cAutoPtr() : mRefCount(0), mPtr(0) { } cAutoPtr( const cAutoPtr & i_autoPtr ) : mRefCount(0), mPtr(0) { assign( i_autoPtr ); } cAutoPtr( tValue * io_ptr ) : mRefCount(0), mPtr(0) { assign( io_ptr ); } ~cAutoPtr() { release(); } const tRefCount count() const { assert(mRefCount); return (*mRefCount); } void assign( const cAutoPtr & i_autoPtr ) { // Check for self assignment if (i_autoPtr.mPtr==mPtr) return; // Clean the slate release(); // If we're assigning to a null (acting) autopointer, stop // after releasing if ( (0==i_autoPtr.mPtr) || (0==i_autoPtr.mRefCount) ) return; mRefCount = i_autoPtr.mRefCount; mPtr = i_autoPtr.mPtr; incRefCount(); } void assign( tValue * i_ptr ) { // Check for self assignment if (i_ptr==mPtr) return; // Clean the slate release(); // If we're assigning null, leave this instance acting as null if (0==i_ptr) return; mRefCount = new tRefCount(1); mPtr = i_ptr; } void operator =( tValue * i_ptr ) { assign(i_ptr); } void operator =( const cAutoPtr & i_autoPtr ) { assign(i_autoPtr); } const tBool operator >(const cAutoPtr &iAutoPtr) const { return get()>iAutoPtr.get(); } const tBool operator <(const cAutoPtr &iAutoPtr) const { return get()<iAutoPtr.get(); } const tBool operator >=(const cAutoPtr &iAutoPtr) const { return get()>=iAutoPtr.get(); } const tBool operator <=(const cAutoPtr &iAutoPtr) const { return get()<=iAutoPtr.get(); } void release() { if (!mPtr) return; decRefCount(); if (!count()) { delete mPtr; delete mRefCount; } mPtr = 0; mRefCount=0; } const tBool equals( const cAutoPtr & i_autoPtr ) const { return (get()==i_autoPtr.get()); } const tBool equals( const tValue * const i_ptr ) const { return (get()==i_ptr); } const tBool operator ==( const tValue * const i_ptr ) const { return equals(i_ptr); } const tBool operator !=( const tValue * const i_ptr ) const { return !equals(i_ptr); } const tBool operator ==( const cAutoPtr & i_autoPtr ) const { return equals(i_autoPtr); } const tBool operator !=( const cAutoPtr & i_autoPtr ) const { return !equals(i_autoPtr); } tValue & operator *() const { return *mPtr; } tValue * operator ->() const { return mPtr; } operator tBool() const { return tBool(mPtr); } void _setRealRefCountPtr( tRefCount * i_newRefCountPtr ) { assert(0==mRefCount); mRefCount = i_newRefCountPtr; } void _setRealPtr( tValue * i_newPtr ) { assert(0==mPtr); mPtr = i_newPtr; } template <class TOtherPtr> cAutoPtr<TOtherPtr> as() const { if (mPtr==0) return 0; TOtherPtr * newPtr; cAutoPtr<TOtherPtr> newAutoPtr; newPtr = dynamic_cast<TOtherPtr *>(mPtr); if (0==newPtr) return 0; newAutoPtr._setRealPtr(newPtr); newAutoPtr._setRealRefCountPtr(mRefCount); incRefCount(); return newAutoPtr; } template <class TOtherPtr> operator cAutoPtr<TOtherPtr>() const { if (mPtr==0) return 0; TOtherPtr * newPtr; cAutoPtr<TOtherPtr> newAutoPtr; newPtr = dynamic_cast<TOtherPtr *>(mPtr); if (0==newPtr) throw cBadCastException( "cAutoPtr::Typecast::dynamic_cast", "Bad Cast"); newAutoPtr._setRealPtr(newPtr); newAutoPtr._setRealRefCountPtr(mRefCount); incRefCount(); return newAutoPtr; } template <class TOtherPtr> operator cAutoPtr<const TOtherPtr>() const { if (mPtr==0) return 0; const TOtherPtr * const newPtr( dynamic_cast<const TOtherPtr * const>(mPtr) ); if (0==newPtr) throw cBadCastException( "cAutoPtr::Typecast::dynamic_cast", "Bad Cast (const)"); cAutoPtr<const TOtherPtr> newAutoPtr; newAutoPtr._setRealPtr(newPtr); newAutoPtr._setRealRefCountPtr(mRefCount); incRefCount(); return newAutoPtr; } /*******************************************************************/ // Auto pointer extensions const tBool isSet() const { return mPtr!=0; } tValue * const dumbPtr() const { return mPtr; } }; } // namespace n2l #endif

©2012 Aaron Cameron