src/core/object.h
author Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
Mon, 02 Jun 2008 10:30:24 -0700
changeset 3190 51fe9001a679
parent 3182 61fe7fe81ebd
child 3394 1680d5004ee8
permissions -rw-r--r--
add some doxygen, remove a couple of XXX
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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
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/*
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 * Copyright (c) 2007 INRIA, Gustavo Carneiro
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License version 2 as
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 * published by the Free Software Foundation;
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 *
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 * Authors: Gustavo Carneiro <gjcarneiro@gmail.com>,
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 *          Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
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 */
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#ifndef OBJECT_H
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#define OBJECT_H
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#include <stdint.h>
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#include <string>
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#include <vector>
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#include "ptr.h"
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#include "attribute.h"
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#include "object-base.h"
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#include "attribute-list.h"
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namespace ns3 {
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class Object;
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class AttributeAccessor;
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class AttributeValue;
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class AttributeList;
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class TraceSourceAccessor;
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/**
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 * \ingroup core
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 * \defgroup object Object
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 */
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/**
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 * \ingroup object
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 * \brief a base class which provides memory management and object aggregation
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 *
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 * The memory management scheme is based on reference-counting with dispose-like
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 * functionality to break the reference cycles. The reference count is increamented
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 * and decremented with the methods Object::Ref and Object::Unref. If a reference cycle is
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 * present, the user is responsible for breaking it by calling Object::Dispose in
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 * a single location. This will eventually trigger the invocation of Object::DoDispose 
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 * on itself and all its aggregates. The Object::DoDispose method is always automatically
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 * invoked from the Object::Unref method before destroying the object, even if the user 
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 * did not call Object::Dispose directly.
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 */
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class Object : public ObjectBase
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{
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public:
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  static TypeId GetTypeId (void);
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  /**
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   * \brief Iterate over the objects aggregated to an ns3::Object.
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   *
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   * This iterator does not allow you to iterate over the initial
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   * object used to call Object::GetAggregateIterator. 
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   *
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   * Note: this is a java-style iterator.
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   */
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  class AggregateIterator
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  {
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  public:
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    AggregateIterator ();
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    /**
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     * \returns true if HasNext can be called and return a non-null
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     *          pointer, false otherwise.
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     */
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    bool HasNext (void) const;
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    /**
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     * \returns the next aggregated object.
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     */
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    Ptr<const Object> Next (void);
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  private:
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    friend class Object;
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    AggregateIterator (Ptr<const Object> first);
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    Ptr<const Object> m_first;
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    Ptr<const Object> m_current;
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  };
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  Object ();
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  virtual ~Object ();
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  /*
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   * Implement the GetInstanceTypeId method defined in ObjectBase.
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   */
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  virtual TypeId GetInstanceTypeId (void) const;
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  /**
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   * Increment the reference count. This method should not be called
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   * by user code. Object instances are expected to be used in conjunction
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   * of the Ptr template which would make calling Ref unecessary and 
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   * dangerous.
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   */
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  inline void Ref (void) const;
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  /**
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   * Decrement the reference count. This method should not be called
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   * by user code. Object instances are expected to be used in conjunction
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   * of the Ptr template which would make calling Ref unecessary and 
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   * dangerous.
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   */
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  inline void Unref (void) const;
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  /**
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   * \returns a pointer to the requested interface or zero if it could not be found.
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   */
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  template <typename T>
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  Ptr<T> GetObject (void) const;
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  /**
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   * \param tid the interface id of the requested interface
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   * \returns a pointer to the requested interface or zero if it could not be found.
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   */
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  template <typename T>
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  Ptr<T> GetObject (TypeId tid) const;
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  /**
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   * Run the DoDispose methods of this object and all the
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   * objects aggregated to it.
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   * After calling this method, the object is expected to be
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   * totally unusable except for the Ref and Unref methods.
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   * It is an error to call Dispose twice on the same object 
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   * instance.
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   *
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   * This method is typically used to break reference cycles.
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   */
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  void Dispose (void);
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  /**
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   * \param other another object pointer
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   *
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   * This method aggregates the two objects together: after this
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   * method returns, it becomes possible to call GetObject
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   * on one to get the other, and vice-versa. 
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   */
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  void AggregateObject (Ptr<Object> other);
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  /**
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   * \returns an iterator to the first object aggregated to this
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   *          object.
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   *
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   * If no objects are aggregated to this object, then, the returned
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   * iterator will be empty and AggregateIterator::HasNext will
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   * always return false.
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   */
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  AggregateIterator GetAggregateIterator (void) const;
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protected:
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  /**
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   * This method is called by Object::Dispose or by the object's 
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   * destructor, whichever comes first.
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   *
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   * Subclasses are expected to implement their real destruction
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   * code in an overriden version of this method and chain
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   * up to their parent's implementation once they are done.
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   * i.e., for simplicity, the destructor of every subclass should
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   * be empty and its content should be moved to the associated
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   * DoDispose method.
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   */
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  virtual void DoDispose (void);
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  /**
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   * \param o the object to copy.
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   *
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   * Allow subclasses to implement a copy constructor.
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   * While it is technically possible to implement a copy
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   * constructor in a subclass, we strongly discourage you
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   * to do so. If you really want to do it anyway, you have
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   * to understand that this copy constructor will _not_
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   * copy aggregated objects. i.e., if your object instance
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   * is already aggregated to another object and if you invoke
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   * this copy constructor, the new object instance will be
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   * a pristine standlone object instance not aggregated to
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   * any other object. It is thus _your_ responsability
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   * as a caller of this method to do what needs to be done
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   * (if it is needed) to ensure that the object stays in a
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   * valid state.
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   */
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  Object (const Object &o);
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private:
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  template <typename T>
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  friend Ptr<T> CreateObject (const AttributeList &attributes);
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  template <typename T>
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  friend Ptr<T> CopyObject (Ptr<T> object);
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  template <typename T>
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  friend Ptr<T> CopyObject (Ptr<const T> object);
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  friend class ObjectFactory;
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  friend class AggregateIterator;
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  Ptr<Object> DoGetObject (TypeId tid) const;
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  bool Check (void) const;
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  bool CheckLoose (void) const;
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  /**
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   * Attempt to delete this object. This method iterates
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   * over all aggregated objects to check if they all 
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   * have a zero refcount. If yes, the object and all
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   * its aggregates are deleted. If not, nothing is done.
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   */
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  void MaybeDelete (void) const;
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  /**
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   * \param tid an TypeId
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   *
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   * Invoked from ns3::CreateObject only.
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   * Initialize the m_tid member variable to
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   * keep track of the type of this object instance.
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   */
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  void SetTypeId (TypeId tid);
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   /**
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   * \param attributes the attribute values used to initialize 
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   *        the member variables of this object's instance.
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   *
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   * Invoked from ns3::ObjectFactory::Create and ns3::CreateObject only.
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   * Initialize all the member variables which were
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   * registered with the associated TypeId.
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   */
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  void Construct (const AttributeList &attributes);
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  /**
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   * The reference count for this object. Each aggregate
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   * has an individual reference count. When the global
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   * reference count (the sum of all reference counts) 
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   * reaches zero, the object and all its aggregates is 
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   * deleted.
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   */
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  mutable uint32_t m_count;
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  /**
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   * Identifies the type of this object instance.
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   */
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  TypeId m_tid;
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  /**
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   * Set to true when the DoDispose method of the object
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   * has run, false otherwise.
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   */
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  bool m_disposed;
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  /**
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   * A pointer to the next aggregate object. This is a circular
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   * linked list of aggregated objects: the last one points
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   * back to the first one. If an object is not aggregated to
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   * any other object, the value of this field is equal to the
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   * value of the 'this' pointer.
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   */
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  Object *m_next;
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};
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/**
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 * \param object a pointer to the object to copy.
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 * \returns a copy of the input object.
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 *
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 * This method invoke the copy constructor of the input object
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 * and returns the new instance.
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 */
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template <typename T>
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Ptr<T> CopyObject (Ptr<const T> object);
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template <typename T>
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Ptr<T> CopyObject (Ptr<T> object);
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/**
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 * \param attributes a list of attributes to set on the 
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 *        object during construction.
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 * \returns a pointer to a newly allocated object.
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 *
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 * This allocates an object on the heap and initializes
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 * it with a set of attributes.
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 */
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template <typename T>
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Ptr<T> CreateObject (const AttributeList &attributes);
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/**
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 * \param n1 name of attribute
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 * \param v1 value of attribute
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 * \param n2 name of attribute
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 * \param v2 value of attribute
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 * \param n3 name of attribute
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 * \param v3 value of attribute
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 * \param n4 name of attribute
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 * \param v4 value of attribute
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 * \param n5 name of attribute
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 * \param v5 value of attribute
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 * \param n6 name of attribute
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 * \param v6 value of attribute
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 * \param n7 name of attribute
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 * \param v7 value of attribute
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 * \param n8 name of attribute
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 * \param v8 value of attribute
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 * \param n9 name of attribute
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 * \param v9 value of attribute
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 * \returns a pointer to a newly allocated object.
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 *
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 * This allocates an object on the heap and initializes
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 * it with a set of attributes.
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 */
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template <typename T>
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Ptr<T> 
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CreateObject (std::string n1 = "", const AttributeValue & v1 = EmptyAttributeValue (),
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              std::string n2 = "", const AttributeValue & v2 = EmptyAttributeValue (),
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              std::string n3 = "", const AttributeValue & v3 = EmptyAttributeValue (),
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              std::string n4 = "", const AttributeValue & v4 = EmptyAttributeValue (),
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              std::string n5 = "", const AttributeValue & v5 = EmptyAttributeValue (),
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              std::string n6 = "", const AttributeValue & v6 = EmptyAttributeValue (),
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              std::string n7 = "", const AttributeValue & v7 = EmptyAttributeValue (),
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              std::string n8 = "", const AttributeValue & v8 = EmptyAttributeValue (),
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              std::string n9 = "", const AttributeValue & v9 = EmptyAttributeValue ());
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} // namespace ns3
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namespace ns3 {
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/*************************************************************************
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 *   The Object implementation which depends on templates
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 *************************************************************************/
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void
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Object::Ref (void) const
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{
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  m_count++;
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}
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void
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Object::Unref (void) const
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{
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  NS_ASSERT (Check ());
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  m_count--;
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  if (m_count == 0)
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    {
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      MaybeDelete ();
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    }
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}
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template <typename T>
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Ptr<T> 
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Object::GetObject () const
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{
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  Ptr<Object> found = DoGetObject (T::GetTypeId ());
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  if (found != 0)
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    {
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      return Ptr<T> (dynamic_cast<T *> (PeekPointer (found)));
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    }
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  return 0;
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}
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template <typename T>
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Ptr<T> 
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Object::GetObject (TypeId tid) const
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{
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  Ptr<Object> found = DoGetObject (tid);
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  if (found != 0)
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    {
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      return Ptr<T> (dynamic_cast<T *> (PeekPointer (found)));
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    }
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  return 0;
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}
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/*************************************************************************
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 *   The helper functions which need templates.
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 *************************************************************************/
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template <typename T>
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Ptr<T> CopyObject (Ptr<T> object)
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{
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  Ptr<T> p = Ptr<T> (new T (*PeekPointer (object)), false);
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  NS_ASSERT (p->m_tid == object->m_tid);
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  return p;
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}
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template <typename T>
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Ptr<T> CopyObject (Ptr<const T> object)
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{
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  Ptr<T> p = Ptr<T> (new T (*PeekPointer (object)), false);
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  NS_ASSERT (p->m_tid == object->m_tid);
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  return p;
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}
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template <typename T>
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Ptr<T> CreateObject (const AttributeList &attributes)
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{
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  Ptr<T> p = Ptr<T> (new T (), false);
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  p->SetTypeId (T::GetTypeId ());
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  p->Object::Construct (attributes);
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  return p;  
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}
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template <typename T>
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Ptr<T> 
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CreateObject (std::string n1 = "", const AttributeValue & v1 = EmptyAttributeValue (),
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              std::string n2 = "", const AttributeValue & v2 = EmptyAttributeValue (),
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              std::string n3 = "", const AttributeValue & v3 = EmptyAttributeValue (),
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              std::string n4 = "", const AttributeValue & v4 = EmptyAttributeValue (),
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              std::string n5 = "", const AttributeValue & v5 = EmptyAttributeValue (),
mathieu@2965
   401
              std::string n6 = "", const AttributeValue & v6 = EmptyAttributeValue (),
mathieu@2965
   402
              std::string n7 = "", const AttributeValue & v7 = EmptyAttributeValue (),
mathieu@2965
   403
              std::string n8 = "", const AttributeValue & v8 = EmptyAttributeValue (),
mathieu@2965
   404
              std::string n9 = "", const AttributeValue & v9 = EmptyAttributeValue ())
mathieu@2372
   405
{
mathieu@2459
   406
  AttributeList attributes;
mathieu@2591
   407
  if (n1 == "")
mathieu@2591
   408
    {
mathieu@2591
   409
      goto end;
mathieu@2591
   410
    }
mathieu@2458
   411
  attributes.SetWithTid (T::GetTypeId (), n1, v1);
mathieu@2591
   412
  if (n2 == "")
mathieu@2591
   413
    {
mathieu@2591
   414
      goto end;
mathieu@2591
   415
    }
mathieu@2458
   416
  attributes.SetWithTid (T::GetTypeId (), n2, v2);
mathieu@2591
   417
  if (n3 == "")
mathieu@2591
   418
    {
mathieu@2591
   419
      goto end;
mathieu@2591
   420
    }
mathieu@2489
   421
  attributes.SetWithTid (T::GetTypeId (), n3, v3);
mathieu@2591
   422
  if (n4 == "")
mathieu@2591
   423
    {
mathieu@2591
   424
      goto end;
mathieu@2591
   425
    }
mathieu@2489
   426
  attributes.SetWithTid (T::GetTypeId (), n4, v4);
mathieu@2591
   427
  if (n5 == "")
mathieu@2591
   428
    {
mathieu@2591
   429
      goto end;
mathieu@2591
   430
    }
mathieu@2489
   431
  attributes.SetWithTid (T::GetTypeId (), n5, v5);
mathieu@2591
   432
  if (n6 == "")
mathieu@2591
   433
    {
mathieu@2591
   434
      goto end;
mathieu@2591
   435
    }
mathieu@2489
   436
  attributes.SetWithTid (T::GetTypeId (), n6, v6);
mathieu@2591
   437
  if (n7 == "")
mathieu@2591
   438
    {
mathieu@2591
   439
      goto end;
mathieu@2591
   440
    }
mathieu@2489
   441
  attributes.SetWithTid (T::GetTypeId (), n7, v7);
mathieu@2591
   442
  if (n8 == "")
mathieu@2591
   443
    {
mathieu@2591
   444
      goto end;
mathieu@2591
   445
    }
mathieu@2489
   446
  attributes.SetWithTid (T::GetTypeId (), n8, v8);
mathieu@2591
   447
  if (n9 == "")
mathieu@2591
   448
    {
mathieu@2591
   449
      goto end;
mathieu@2591
   450
    }
mathieu@2489
   451
  attributes.SetWithTid (T::GetTypeId (), n9, v9);
mathieu@2591
   452
 end:
mathieu@2458
   453
  return CreateObject<T> (attributes);
mathieu@2372
   454
}
mathieu@2372
   455
mathieu@699
   456
} // namespace ns3
mathieu@699
   457
mathieu@706
   458
#endif /* OBJECT_H */
mathieu@699
   459