A Discrete-Event Network Simulator
API
main-ptr.cc
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1 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
2 /*
3  * Copyright (c) 2006 INRIA
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License version 2 as
7  * published by the Free Software Foundation;
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write to the Free Software
16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17  *
18  */
19 
20 #include "ns3/ptr.h"
21 #include "ns3/object.h"
22 #include "ns3/command-line.h"
23 #include <iostream>
24 
32 using namespace ns3;
33 
37 class PtrExample : public Object
38 {
39 public:
41  PtrExample ();
43  ~PtrExample ();
45  void Method (void);
46 };
48 {
49  std::cout << "PtrExample constructor" << std::endl;
50 }
52 {
53  std::cout << "PtrExample destructor" << std::endl;
54 }
55 void
57 {
58  std::cout << "PtrExample method" << std::endl;
59 }
60 
61 
66 
75 static Ptr<PtrExample>
77 {
78  Ptr<PtrExample> prev = g_ptr;
79  g_ptr = p;
80  return prev;
81 }
82 
86 static void
87 ClearPtr (void)
88 {
89  g_ptr = 0;
90 }
91 
92 
93 
94 int main (int argc, char *argv[])
95 {
97  cmd.Parse (argc, argv);
98 
99  {
100  // Create a new object of type PtrExample, store it in global
101  // variable g_ptr
102  Ptr<PtrExample> p = CreateObject<PtrExample> ();
103  p->Method ();
104  Ptr<PtrExample> prev = StorePtr (p);
105  NS_ASSERT (prev == 0);
106  }
107 
108  {
109  // Create a new object of type PtrExample, store it in global
110  // variable g_ptr, get a hold on the previous PtrExample object.
111  Ptr<PtrExample> p = CreateObject<PtrExample> ();
112  Ptr<PtrExample> prev = StorePtr (p);
113  // call method on object
114  prev->Method ();
115  // Clear the currently-stored object
116  ClearPtr ();
117  // get the raw pointer and release it.
118  PtrExample *raw = GetPointer (prev);
119  prev = 0;
120  raw->Method ();
121  raw->Unref ();
122  }
123 
124 
125  return 0;
126 }
Smart pointer class similar to boost::intrusive_ptr.
Definition: ptr.h:73
void Unref(void) const
Decrement the reference count.
#define NS_ASSERT(condition)
At runtime, in debugging builds, if this condition is not true, the program prints the source file...
Definition: assert.h:67
cmd
Definition: second.py:35
U * GetPointer(const Ptr< U > &p)
Definition: ptr.h:572
void Method(void)
Example class method.
Definition: main-ptr.cc:56
Example class illustrating use of Ptr.
Definition: main-ptr.cc:37
static void ClearPtr(void)
Set g_ptr to NULL.
Definition: main-ptr.cc:87
Parse command-line arguments.
Definition: command-line.h:212
Every class exported by the ns3 library is enclosed in the ns3 namespace.
~PtrExample()
Destructor.
Definition: main-ptr.cc:51
static Ptr< PtrExample > StorePtr(Ptr< PtrExample > p)
Example Ptr manipulations.
Definition: main-ptr.cc:76
A base class which provides memory management and object aggregation.
Definition: object.h:87
PtrExample()
Constructor.
Definition: main-ptr.cc:47
static Ptr< PtrExample > g_ptr
Example Ptr global variable.
Definition: main-ptr.cc:65