/Users/barrand/private/dev/softinex/old/inexlib-1.2/inlib/inlib/sg/holder

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// Copyright (C) 2010, Guy Barrand. All rights reserved.
// See the file inlib.license for terms.

#ifndef inlib_sg_holder
#define inlib_sg_holder

// class to manage an object.
// Only one holder owns the object. In case
// of holder copy(), the new holder receives a null object.

#include "node"

namespace inlib {
namespace sg {

template <class T>
class holder : public node {
public:
  static const std::string& s_class() {
    static const std::string s_v("inlib::sg::holder");
    return s_v;
  }
public:
  virtual void* cast(const std::string& a_class) const {
    if(void* p = inlib::cmp_cast< holder<T> >(this,a_class)) {return p;}
    return node::cast(a_class);
  }
  virtual node* copy() const {return new holder(*this);}
  virtual const std::string& s_cls() const {return s_class();}
public:  
  holder(T* a_obj):m_obj(a_obj){} //it takes a_obj ownership.
  virtual ~holder(){delete m_obj;}
public:
  holder(const holder& a_from):node(a_from),m_obj(0){}
  holder& operator=(const holder& a_from){
    node::operator=(a_from);
    m_obj=0;
    return *this;
  }
protected:
  T* m_obj;
};

}}

#endif