gdcmSmartPointer.h
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/*=========================================================================
Program: GDCM (Grassroots DICOM). A DICOM library
Copyright (c) 2006-2011 Mathieu Malaterre
All rights reserved.
See Copyright.txt or http://gdcm.sourceforge.net/Copyright.html for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#ifndef GDCMSMARTPOINTER_H
#define GDCMSMARTPOINTER_H
#include "gdcmObject.h"
namespace gdcm
{
template<class ObjectType>
class SmartPointer
{
public:
SmartPointer():Pointer(nullptr) {}
SmartPointer(const SmartPointer<ObjectType>& p):Pointer(p.Pointer)
{ Register(); }
SmartPointer(ObjectType* p):Pointer(p)
{ Register(); }
SmartPointer(ObjectType const & p)
{
Pointer = const_cast<ObjectType*>(&p);
Register();
}
~SmartPointer() {
UnRegister();
Pointer = nullptr;
}
ObjectType *operator -> () const
{ return Pointer; }
ObjectType& operator * () const
{
assert( Pointer );
return *Pointer;
}
operator ObjectType * () const
{ return Pointer; }
SmartPointer &operator = (SmartPointer const &r)
{ return operator = (r.Pointer); }
SmartPointer &operator = (ObjectType *r)
{
// http://www.parashift.com/c++-faq-lite/freestore-mgmt.html#faq-16.22
// DO NOT CHANGE THE ORDER OF THESE STATEMENTS!
// (This order properly handles self-assignment)
// (This order also properly handles recursion, e.g., if a ObjectType contains SmartPointer<ObjectType>s)
if( Pointer != r )
{
ObjectType* old = Pointer;
Pointer = r;
Register();
if ( old ) { old->UnRegister(); }
}
return *this;
}
SmartPointer &operator = (ObjectType const &r)
{
ObjectType* tmp = const_cast<ObjectType*>(&r);
return operator = (tmp);
}
ObjectType *GetPointer() const
{ return Pointer; }
private:
void Register()
{
if(Pointer) Pointer->Register();
}
void UnRegister()
{
if(Pointer) Pointer->UnRegister();
}
ObjectType* Pointer;
};
} // end namespace gdcm
#endif //GDCMSMARTPOINTER_H
gdcm::SmartPointer::operator*
ObjectType & operator*() const
Definition gdcmSmartPointer.h:61
gdcm::SmartPointer::SmartPointer
SmartPointer()
Definition gdcmSmartPointer.h:42
gdcm::SmartPointer::operator=
SmartPointer & operator=(SmartPointer const &r)
Overload operator assignment.
Definition gdcmSmartPointer.h:72
gdcm::SmartPointer::SmartPointer
SmartPointer(const SmartPointer< ObjectType > &p)
Definition gdcmSmartPointer.h:43
gdcm::SmartPointer::~SmartPointer
~SmartPointer()
Definition gdcmSmartPointer.h:52
gdcm::SmartPointer::operator->
ObjectType * operator->() const
Overload operator ->.
Definition gdcmSmartPointer.h:58
gdcm::SmartPointer::SmartPointer
SmartPointer(ObjectType *p)
Definition gdcmSmartPointer.h:45
gdcm::SmartPointer::GetPointer
ObjectType * GetPointer() const
Explicit function to retrieve the pointer.
Definition gdcmSmartPointer.h:99
gdcm::SmartPointer::SmartPointer
SmartPointer(ObjectType const &p)
Definition gdcmSmartPointer.h:47
gdcmObject.h
gdcm
Definition gdcmASN1.h:21