SmartPtrBase.h

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/********************************************************************
**                Image Component Library (ICL)                    **
**                                                                 **
** Copyright (C) 2006-2013 CITEC, University of Bielefeld          **
**                         Neuroinformatics Group                  **
** Website: www.iclcv.org and                                      **
**          http://opensource.cit-ec.de/projects/icl               **
**                                                                 **
** File   : ICLUtils/src/ICLUtils/SmartPtrBase.h                   **
** Module : ICLUtils                                               **
** Authors: Christof Elbrechter, Robert Haschke                    **
**                                                                 **
**                                                                 **
** GNU LESSER GENERAL PUBLIC LICENSE                               **
** This file may be used under the terms of the GNU Lesser General **
** Public License version 3.0 as published by the                  **
**                                                                 **
** Free Software Foundation and appearing in the file LICENSE.LGPL **
** included in the packaging of this file.  Please review the      **
** following information to ensure the license requirements will   **
** be met: http://www.gnu.org/licenses/lgpl-3.0.txt                **
**                                                                 **
** The development of this software was supported by the           **
** Excellence Cluster EXC 277 Cognitive Interaction Technology.    **
** The Excellence Cluster EXC 277 is a grant of the Deutsche       **
** Forschungsgemeinschaft (DFG) in the context of the German       **
** Excellence Initiative.                                          **
**                                                                 **
********************************************************************/

#pragma once

#include <ICLUtils/Macros.h>
#include <cstdlib>

namespace icl{
  namespace utils{
    
    class DelOpBase { };
    
    struct PointerDelOp : public DelOpBase{ template<class T> static void delete_func(T *t){ delete t; } };
  
    struct ArrayDelOp : public DelOpBase{ template<class T>  static void delete_func(T *t){ delete[] t; } };
  
    struct FreeDelOp : public DelOpBase{ static void delete_func(void *v){ free(v); } };
    

    template<class T, class delOp = ArrayDelOp > 
    class SmartPtrBase{
      protected:
      T   *e; 
      int *c; 
      bool d; 

      void inc() {
        if(c) (*c)++; 
      }
  
      void dec() { 
        if(c && *c) { 
          if ( --(*c) == 0) { 
            //               if(d) delete[] e; 
            if(d) delOp::delete_func(e);
            delete c;
            c = 0;
          }
        }
      }
  
      void set(T *e,int *c, bool d) {
        this->e=e; 
        this->c=c; 
        this->d=d;
      }
        
      template<class DerivedT>
      inline SmartPtrBase<T,delOp> &assign(const SmartPtrBase<DerivedT,delOp>& r){
        if(r.e == e) return *this;
        dec();
        set(r.e,r.c,r.d);
        inc();
        return *this;
      }
           
      public:
        
      template<class A, class B> friend class SmartPtrBase;
    
      SmartPtrBase(): e(0),c(0),d(0){
      }    
        
      template<class DerivedT>
      SmartPtrBase(DerivedT *ptData, bool bOwn=true): e(ptData), c(new int(1)),d(bOwn){
      }
        

      template<class DerivedT>
      SmartPtrBase(const SmartPtrBase<DerivedT,delOp> &r): e(&dynamic_cast<T&>(*r.e)), c(r.c), d(r.d){ 
        //      SmartPtrBase(const SmartPtrBase<DerivedT,delOp> &r): e(r.e), c(r.c), d(r.d){ 
        inc(); 
      }
  

      SmartPtrBase(const SmartPtrBase<T,delOp> &r): e(r.e), c(r.c), d(r.d){ 
        inc(); 
      }
        

      template<class DerivedT>
      SmartPtrBase<T,delOp> &operator=(const SmartPtrBase<DerivedT,delOp>& r){
        return assign(r);
  
      }
  

      SmartPtrBase<T,delOp> &operator=(const SmartPtrBase<T,delOp>& r){
        return assign(r);
      }
  

      template<class DerivedT>
      SmartPtrBase<T,delOp> &operator=(DerivedT *p){
        return this->operator=(SmartPtrBase<T,delOp>(p));
      }
  
      SmartPtrBase<T,delOp> &operator=(T *p){
        return this->operator=(SmartPtrBase<T,delOp>(p));
      }
  
      ~SmartPtrBase() { dec(); }
          

      T &operator* () { ICLASSERT(e); return *e; }
  

      const T &operator* () const { ICLASSERT(e); return *e; }
        
  

      T* get () { return e; }
  

      const T* get () const { return e; }
  
  

      T *operator-> () { ICLASSERT(e); return e; }
  

      const T *operator-> () const { ICLASSERT(e); return e; }
  
  
      operator bool() const { return (e != 0); }
    
      int use_count() const { return c ? *c : 0; }
        

      void setNull() { 
        dec();
        set(0,0,0);
      }
    };
  
  } // namespace utils
}