/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
* Copyright (c) 2005,2006 INRIA
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation;
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
*/
#ifndef PTR_H
#define PTR_H
#include <stdint.h>
#include "assert.h"
namespace ns3 {
/**
* \brief smart pointer class similar to boost::intrusive_ptr
*
* This smart-pointer class assumes that the underlying
* type provides a pair of Ref and Unref methods which are
* expected to increment and decrement the internal refcount
* of the object instance.
*
* This implementation allows you to manipulate the smart pointer
* as if it was a normal pointer: you can compare it with zero,
* compare it against other pointers, assign zero to it, etc.
*
* It is possible to extract the raw pointer from this
* smart pointer with the GetPointer and PeekPointer methods.
*
* If you want to store a newed object into a smart pointer,
* we recommend you to use the MakeNewObject template functions
* to create the object and store it in a smart pointer to avoid
* memory leaks. These functions are really small conveniance
* functions and their goal is just is save you a small
* bit of typing.
*/
template <typename T>
class Ptr
{
private:
T *m_ptr;
class Tester {
private:
void operator delete (void *);
};
friend class Ptr<const T>;
template <typename U>
friend U *GetPointer (const Ptr<U> &p);
template <typename U>
friend U *PeekPointer (const Ptr<U> &p);
void Acquire (void) const;
public:
/**
* Create an empty smart pointer
*/
Ptr ();
/**
* \param ptr raw pointer to manage
*
* Create a smart pointer which points to the
* input raw pointer. This method takes ownershipt
* of the input raw pointer. That is, the smart pointer
* becomes responsible for calling delete on the
* raw pointer when needed.
*/
Ptr (T *ptr);
Ptr (Ptr const&o);
// allow conversions from T to T const.
template <typename U>
Ptr (Ptr<U> const &o);
~Ptr () ;
Ptr<T> &operator = (Ptr const& o);
T *operator -> () const;
T *operator -> ();
// allow if (!sp)
bool operator! ();
// allow if (sp)
// disable delete sp
operator Tester * () const;
};
template <typename T>
Ptr<T> MakeNewObject (void);
template <typename T, typename T1>
Ptr<T> MakeNewObject (T1 a1);
template <typename T, typename T1, typename T2>
Ptr<T> MakeNewObject (T1 a1, T2 a2);
template <typename T, typename T1, typename T2, typename T3>
Ptr<T> MakeNewObject (T1 a1, T2 a2, T3 a3);
template <typename T, typename T1, typename T2, typename T3, typename T4>
Ptr<T> MakeNewObject (T1 a1, T2 a2, T3 a3, T4 a4);
template <typename T, typename T1, typename T2, typename T3, typename T4, typename T5>
Ptr<T> MakeNewObject (T1 a1, T2 a2, T3 a3, T4 a4, T5 a5);
template <typename T, typename T1, typename T2, typename T3, typename T4, typename T5, typename T6>
Ptr<T> MakeNewObject (T1 a1, T2 a2, T3 a3, T4 a4, T5 a5, T6 a6);
template <typename T, typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7>
Ptr<T> MakeNewObject (T1 a1, T2 a2, T3 a3, T4 a4, T5 a5, T6 a6, T7 a7);
/**
* \relates Ptr
* \return the pointer managed by this smart pointer.
*
* The underlying refcount is not incremented prior
* to returning to the caller so the caller is not
* responsible for calling Unref himself.
*/
template <typename T>
T * PeekPointer (const Ptr<T> &p);
/**
* \relates Ptr
* \return the pointer managed by this smart pointer.
*
* The underlying refcount is incremented prior
* to returning to the caller so the caller is
* responsible for calling Unref himself.
*/
template <typename T>
T * GetPointer (const Ptr<T> &p);
// allow if (sp == 0)
template <typename T1, typename T2>
bool operator == (Ptr<T1> const &lhs, T2 const *rhs);
// allow if (0 == sp)
template <typename T1, typename T2>
bool operator == (T1 const *lhs, Ptr<T2> &rhs);
// allow if (sp != 0)
template <typename T1, typename T2>
bool operator != (Ptr<T1> const &lhs, T2 const *rhs);
// allow if (0 != sp)
template <typename T1, typename T2>
bool operator != (T1 const *lhs, Ptr<T2> &rhs);
// allow if (sp0 == sp1)
template <typename T1, typename T2>
bool operator == (Ptr<T1> const &lhs, Ptr<T2> const &rhs);
// allow if (sp0 != sp1)
template <typename T1, typename T2>
bool operator != (Ptr<T1> const &lhs, Ptr<T2> const &rhs);
template <typename T1, typename T2>
Ptr<T1> const_pointer_cast (Ptr<T2> const&p);
} // namespace ns3
namespace ns3 {
/*************************************************
* friend non-member function implementations
************************************************/
template <typename T>
Ptr<T> MakeNewObject (void)
{
T *obj = new T ();
Ptr<T> p = obj;
obj->Unref ();
return p;
}
template <typename T, typename T1>
Ptr<T> MakeNewObject (T1 a1)
{
T *obj = new T (a1);
Ptr<T> p = obj;
obj->Unref ();
return p;
}
template <typename T, typename T1, typename T2>
Ptr<T> MakeNewObject (T1 a1, T2 a2)
{
T *obj = new T (a1, a2);
Ptr<T> p = obj;
obj->Unref ();
return p;
}
template <typename T, typename T1, typename T2, typename T3>
Ptr<T> MakeNewObject (T1 a1, T2 a2, T3 a3)
{
T *obj = new T (a1, a2, a3);
Ptr<T> p = obj;
obj->Unref ();
return p;
}
template <typename T, typename T1, typename T2, typename T3, typename T4>
Ptr<T> MakeNewObject (T1 a1, T2 a2, T3 a3, T4 a4)
{
T *obj = new T (a1, a2, a3, a4);
Ptr<T> p = obj;
obj->Unref ();
return p;
}
template <typename T, typename T1, typename T2, typename T3, typename T4, typename T5>
Ptr<T> MakeNewObject (T1 a1, T2 a2, T3 a3, T4 a4, T5 a5)
{
T *obj = new T (a1, a2, a3, a4, a5);
Ptr<T> p = obj;
obj->Unref ();
return p;
}
template <typename T, typename T1, typename T2, typename T3, typename T4, typename T5, typename T6>
Ptr<T> MakeNewObject (T1 a1, T2 a2, T3 a3, T4 a4, T5 a5, T6 a6)
{
T *obj = new T (a1, a2, a3, a4, a5, a6);
Ptr<T> p = obj;
obj->Unref ();
return p;
}
template <typename T, typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7>
Ptr<T> MakeNewObject (T1 a1, T2 a2, T3 a3, T4 a4, T5 a5, T6 a6, T7 a7)
{
T *obj = new T (a1, a2, a3, a4, a5, a6, a7);
Ptr<T> p = obj;
obj->Unref ();
return p;
}
template <typename T>
T * PeekPointer (const Ptr<T> &p)
{
return p.m_ptr;
}
template <typename T>
T * GetPointer (const Ptr<T> &p)
{
p.Acquire ();
return p.m_ptr;
}
template <typename T1, typename T2>
bool
operator == (Ptr<T1> const &lhs, T2 const *rhs)
{
return PeekPointer (lhs) == rhs;
}
template <typename T1, typename T2>
bool
operator == (T1 const *lhs, Ptr<T2> &rhs)
{
return lhs == PeekPointer (rhs);
}
template <typename T1, typename T2>
bool
operator != (Ptr<T1> const &lhs, T2 const *rhs)
{
return PeekPointer (lhs) != rhs;
}
template <typename T1, typename T2>
bool
operator != (T1 const *lhs, Ptr<T2> &rhs)
{
return lhs != PeekPointer (rhs);
}
template <typename T1, typename T2>
bool
operator == (Ptr<T1> const &lhs, Ptr<T2> const &rhs)
{
return PeekPointer (lhs) == PeekPointer (rhs);
}
template <typename T1, typename T2>
bool
operator != (Ptr<T1> const &lhs, Ptr<T2> const &rhs)
{
return PeekPointer (lhs) != PeekPointer (rhs);
}
template <typename T1, typename T2>
Ptr<T1>
const_pointer_cast (Ptr<T2> const&p)
{
return Ptr<T1> (const_cast<T1 *> (PeekPointer (p)));
}
/****************************************************
* Member method implementations.
***************************************************/
template <typename T>
void
Ptr<T>::Acquire (void) const
{
if (m_ptr != 0)
{
m_ptr->Ref ();
}
}
template <typename T>
Ptr<T>::Ptr ()
: m_ptr (0)
{}
template <typename T>
Ptr<T>::Ptr (T *ptr)
: m_ptr (ptr)
{
Acquire ();
}
template <typename T>
Ptr<T>::Ptr (Ptr const&o)
: m_ptr (PeekPointer (o))
{
Acquire ();
}
template <typename T>
template <typename U>
Ptr<T>::Ptr (Ptr<U> const &o)
: m_ptr (PeekPointer (o))
{
Acquire ();
}
template <typename T>
Ptr<T>::~Ptr ()
{
if (m_ptr != 0)
{
m_ptr->Unref();
}
}
template <typename T>
Ptr<T> &
Ptr<T>::operator = (Ptr const& o)
{
if (&o == this)
{
return *this;
}
if (m_ptr != 0)
{
m_ptr->Unref();
}
m_ptr = o.m_ptr;
Acquire ();
return *this;
}
template <typename T>
T *
Ptr<T>::operator -> ()
{
return m_ptr;
}
template <typename T>
T *
Ptr<T>::operator -> () const
{
return m_ptr;
}
template <typename T>
bool
Ptr<T>::operator! ()
{
return m_ptr == 0;
}
template <typename T>
Ptr<T>::operator Tester * () const
{
if (m_ptr == 0)
{
return 0;
}
static Tester test;
return &test;
}
}; // namespace ns3
#endif /* PTR_H */