180 lines
4.3 KiB
C++
180 lines
4.3 KiB
C++
/*
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Copyright (C) 2001-2006, William Joseph.
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All Rights Reserved.
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This file is part of GtkRadiant.
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GtkRadiant is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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GtkRadiant 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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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GtkRadiant; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#if !defined( INCLUDED_GENERIC_REFERENCECOUNTED_H )
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#define INCLUDED_GENERIC_REFERENCECOUNTED_H
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/// \file
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/// \brief 'smart' pointers and references.
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#include <algorithm>
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template<typename Type>
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class IncRefDecRefCounter
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{
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public:
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void increment( Type& value ){
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value.IncRef();
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}
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void decrement( Type& value ){
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value.DecRef();
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}
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};
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/// \brief A smart-pointer that uses a counter stored in the object pointed-to.
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template<typename Type, typename Counter = IncRefDecRefCounter<Type> >
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class SmartPointer : public Counter
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{
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Type* m_value;
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public:
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SmartPointer( const SmartPointer& other )
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: m_value( other.m_value ){
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Counter::increment( *m_value );
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}
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explicit SmartPointer( Type* value )
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: m_value( value ){
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Counter::increment( *m_value );
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}
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~SmartPointer(){
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Counter::decrement( *m_value );
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}
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SmartPointer& operator=( const SmartPointer& other ){
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SmartPointer temp( other );
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temp.swap( *this );
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return *this;
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}
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SmartPointer& operator=( Type* value ){
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SmartPointer temp( value );
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temp.swap( *this );
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return *this;
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}
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void swap( SmartPointer& other ){
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std::swap( m_value, other.m_value );
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}
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operator Type*() const
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{
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return m_value;
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}
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Type& operator*() const {
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return *m_value;
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}
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Type* operator->() const {
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return m_value;
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}
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Type* get() const {
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return m_value;
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}
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};
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template<typename Type>
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inline bool operator<( const SmartPointer<Type>& self, const SmartPointer<Type>& other ){
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return self.get() < other.get();
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}
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template<typename Type>
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inline bool operator==( const SmartPointer<Type>& self, const SmartPointer<Type>& other ){
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return self.get() == other.get();
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}
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template<typename Type>
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inline bool operator!=( const SmartPointer<Type>& self, const SmartPointer<Type>& other ){
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return !::operator==( self, other );
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}
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namespace std
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{
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/// \brief Swaps the values of \p self and \p other.
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/// Overloads std::swap().
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template<typename Type>
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inline void swap( SmartPointer<Type>& self, SmartPointer<Type>& other ){
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self.swap( other );
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}
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}
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/// \brief A smart-reference that uses a counter stored in the object pointed-to.
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template<typename Type, typename Counter = IncRefDecRefCounter<Type> >
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class SmartReference : public Counter
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{
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Type* m_value;
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public:
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SmartReference( const SmartReference& other )
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: m_value( other.m_value ){
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Counter::increment( *m_value );
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}
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explicit SmartReference( Type& value )
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: m_value( &value ){
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Counter::increment( *m_value );
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}
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~SmartReference(){
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Counter::decrement( *m_value );
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}
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SmartReference& operator=( const SmartReference& other ){
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SmartReference temp( other );
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temp.swap( *this );
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return *this;
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}
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SmartReference& operator=( Type& value ){
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SmartReference temp( value );
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temp.swap( *this );
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return *this;
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}
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void swap( SmartReference& other ){
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std::swap( m_value, other.m_value );
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}
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operator Type&() const
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{
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return *m_value;
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}
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Type& get() const {
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return *m_value;
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}
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Type* get_pointer() const {
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return m_value;
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}
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};
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template<typename Type>
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inline bool operator<( const SmartReference<Type>& self, const SmartReference<Type>& other ){
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return self.get() < other.get();
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}
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template<typename Type>
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inline bool operator==( const SmartReference<Type>& self, const SmartReference<Type>& other ){
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return self.get() == other.get();
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}
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template<typename Type>
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inline bool operator!=( const SmartReference<Type>& self, const SmartReference<Type>& other ){
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return !::operator==( self, other );
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}
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namespace std
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{
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/// \brief Swaps the values of \p self and \p other.
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/// Overloads std::swap().
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template<typename Type>
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inline void swap( SmartReference<Type>& self, SmartReference<Type>& other ){
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self.swap( other );
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}
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}
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#endif
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