Gabriele Cosmo
84 lines
1.8 KiB
Plaintext
84 lines
1.8 KiB
Plaintext
// Copyright (C) 2010, Guy Barrand. All rights reserved.
|
|
// See the file tools.license for terms.
|
|
|
|
#ifndef tools_handle
|
|
#define tools_handle
|
|
|
|
#ifdef TOOLS_MEM
|
|
#include "mem"
|
|
#endif
|
|
|
|
#include <string>
|
|
|
|
namespace tools {
|
|
|
|
class base_handle {
|
|
static const std::string& s_class() {
|
|
static const std::string s_v("tools::handle");
|
|
return s_v;
|
|
}
|
|
public:
|
|
virtual void* object() const = 0;
|
|
virtual base_handle* copy() = 0; //can't be const.
|
|
virtual void disown() = 0;
|
|
public:
|
|
base_handle(){
|
|
#ifdef TOOLS_MEM
|
|
mem::increment(s_class().c_str());
|
|
#endif
|
|
}
|
|
virtual ~base_handle(){
|
|
#ifdef TOOLS_MEM
|
|
mem::decrement(s_class().c_str());
|
|
#endif
|
|
}
|
|
protected:
|
|
base_handle(base_handle&){
|
|
#ifdef TOOLS_MEM
|
|
mem::increment(s_class().c_str());
|
|
#endif
|
|
}
|
|
private:
|
|
//base_handle(const base_handle&){}
|
|
//base_handle& operator=(const base_handle&){return *this;}
|
|
base_handle& operator=(base_handle&){return *this;}
|
|
};
|
|
|
|
template <class T>
|
|
class handle : public base_handle {
|
|
typedef base_handle parent;
|
|
public:
|
|
virtual void* object() const {return m_obj;}
|
|
virtual base_handle* copy() {return new handle<T>(*this);}
|
|
virtual void disown() {m_owner = false;}
|
|
public:
|
|
handle(T* a_obj,bool a_owner = true)
|
|
:parent()
|
|
,m_obj(a_obj),m_owner(a_owner){}
|
|
virtual ~handle(){if(m_owner) delete m_obj;}
|
|
private:
|
|
handle(handle& a_from):parent(a_from){
|
|
m_obj = a_from.m_obj;
|
|
if(a_from.m_owner) {
|
|
// this take ownership.
|
|
m_owner = true;
|
|
a_from.m_owner = false;
|
|
} else {
|
|
m_owner = false;
|
|
}
|
|
//a_from.m_obj = 0; //we do not remove the obj ref in a_from.
|
|
}
|
|
private:
|
|
// in principle the below are not used.
|
|
//handle(const handle& a_from){}
|
|
//handle& operator=(const handle&){return *this;}
|
|
handle& operator=(handle&){return *this;}
|
|
protected:
|
|
T* m_obj;
|
|
bool m_owner;
|
|
};
|
|
|
|
}
|
|
|
|
#endif
|