dptr_shared.h

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//d-ptr header
//
// (c) Konrad Rosenbaum, 2010-2011
// Copying and distribution of this file, with or without modification,
// are permitted in any medium without royalty provided the copyright
// notice and this notice are preserved.  This file is offered as-is,
// without any warranty.

#include "dptr_base.h"


#ifndef DPTR_SHAREDCLASS_0_1_H
#define DPTR_SHAREDCLASS_0_1_H
//hide the namespace
namespace Chester_0_1{

class SharedDPtr
{
        private:
                int cnt;
        public:
                SharedDPtr(){cnt=1;}
                virtual ~SharedDPtr(){}
                virtual void attach(){cnt++;}
                virtual void detach(){cnt--;if(cnt==0)delete this;}
                int currentRefCount()const{return cnt;}
};

//hide the namespace
};
using namespace Chester_0_1;

#endif

#ifdef DEFINE_SHARED_DPTR
#undef DEFINE_SHARED_DPTR
#endif

#define DEFINE_SHARED_DPTR(Class) \
 Class::DPrivate::DPrivate(){d=new Class::Private;}\
 Class::DPrivate::DPrivate(const DPrivate&dp){d=dp.d;d->attach();}\
 Class::DPrivate::~DPrivate(){d->detach();}\
 Class::DPrivate Class::DPrivate::clone()const{DPrivate r;*(r.d)=*d;return r;}\
 Class::DPrivate& Class::DPrivate::operator=(const DPrivate&dp)\
 {if(d!=dp.d){d->detach();d=dp.d;d->attach();}return *this;}\
 void Class::DPrivate::decouple()\
 {if(d->currentRefCount()>1){Private *p=new Class::Private(*d);d->detach();d=p;}}