author | Mathieu Lacage <mathieu.lacage@sophia.inria.fr> |
Mon, 18 Dec 2006 13:17:08 +0100 | |
changeset 223 | 80f1c6b76999 |
child 225 | dad23ccd9e6c |
permissions | -rw-r--r-- |
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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */ |
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/* |
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* Copyright (c) 2005,2006 INRIA |
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* All rights reserved. |
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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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* Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr> |
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*/ |
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|
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#ifndef PTR_H |
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#define PTR_H |
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|
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#include <stdint.h> |
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#include <cassert> |
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|
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namespace ns3 { |
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|
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/** |
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* \brief smart pointer class similar to boost::shared_ptr |
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* |
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* This smart-pointer class is supposed to be used to manage |
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* heap-allocated objects: when it decides it does not need |
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* the object it references, it invokes operator delete on it. |
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* This implementation allows you to manipulate the smart pointer |
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* as if it was a normal pointer: you can compare it with zero, |
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* compare it against other pointers, etc. However, the only |
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* operation we are careful to avoid is the conversion back to |
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* raw pointers: if you need to convert back, you need to invoke |
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* the Ptr<T>::Remove method which returns a raw pointer and |
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* makes the smart pointer forget about the raw pointer. |
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*/ |
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template <typename T> |
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class Ptr |
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{ |
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private: |
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T *m_ptr; |
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uint32_t *m_count; |
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class Tester { |
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private: |
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void operator delete (void *); |
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}; |
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static uint32_t *AllocCount (void); |
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static void DeallocCount (uint32_t *count); |
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public: |
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/** |
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* Create an empty smart pointer |
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*/ |
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Ptr (); |
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/** |
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* \param ptr raw pointer to manage |
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* |
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* Create a smart pointer which points to the |
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* input raw pointer. This method takes ownershipt |
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* of the input raw pointer. That is, the smart pointer |
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* becomes responsible for calling delete on the |
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* raw pointer when needed. |
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*/ |
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Ptr (T *ptr); |
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Ptr (Ptr const&o); |
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// allow conversions from T to T const. |
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template <typename U> |
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Ptr (Ptr<U> const &o); |
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~Ptr () ; |
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Ptr<T> &operator = (Ptr const& o); |
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T *operator -> () const; |
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T *operator -> (); |
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// allow if (!sp) |
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bool operator! (); |
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// allow if (sp) |
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operator Tester * () const; |
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// allow if (sp == 0) |
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template <typename T1, typename T2> |
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inline friend bool operator == (Ptr<T1> const &lhs, T2 const *rhs); |
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// allow if (0 == sp) |
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template <typename T1, typename T2> |
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inline friend bool operator == (T1 const *lhs, Ptr<T2> &rhs); |
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// allow if (sp != 0) |
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template <typename T1, typename T2> |
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inline friend bool operator != (Ptr<T1> const &lhs, T2 const *rhs); |
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// allow if (0 != sp) |
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template <typename T1, typename T2> |
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inline friend bool operator != (T1 const *lhs, Ptr<T2> &rhs); |
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|
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/** |
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* \returns raw pointer |
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* |
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* It is a programming error to invoke this method when |
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* the reference count of the smart pointer is not one. |
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* If you try to do it anyway, an assert will be triggered. |
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* If asserts are disabled, bad things will happen. |
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* Once you have successfully called Ptr<T>::Remove on |
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* a smart pointer, the smart pointer will forget |
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* about the raw pointer and will stop managing it. As such, |
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* you, as the caller, become responsible for invoking |
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* operator delete on the returned raw pointer. |
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*/ |
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T *Remove (void); |
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}; |
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template <typename T> |
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uint32_t * |
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Ptr<T>::AllocCount (void) |
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{ |
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return new uint32_t [1] (); |
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} |
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|
118 |
template <typename T> |
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119 |
void |
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120 |
Ptr<T>::DeallocCount (uint32_t *count) |
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121 |
{ |
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|
122 |
delete [] count; |
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123 |
} |
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124 |
|
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|
125 |
template <typename T> |
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126 |
Ptr<T>::Ptr () |
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127 |
: m_ptr (0), |
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128 |
m_count (Ptr::AllocCount ()) |
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129 |
{} |
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|
130 |
|
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|
131 |
template <typename T> |
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132 |
Ptr<T>::Ptr (T *ptr) |
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133 |
: m_ptr (ptr), |
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|
134 |
m_count (Ptr::AllocCount ()) |
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|
135 |
{ |
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|
136 |
if (m_ptr != 0) |
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|
137 |
{ |
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|
138 |
*m_count = 1; |
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|
139 |
} |
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|
140 |
} |
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|
141 |
|
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|
142 |
template <typename T> |
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143 |
Ptr<T>::Ptr (Ptr const&o) |
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144 |
: m_ptr (o.m_ptr), |
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145 |
m_count (o.m_count) |
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|
146 |
{ |
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|
147 |
if (m_ptr != 0) |
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|
148 |
{ |
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|
149 |
(*m_count)++; |
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150 |
} |
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|
151 |
} |
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|
152 |
template <typename T> |
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153 |
template <typename U> |
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|
154 |
Ptr<T>::Ptr (Ptr<U> const &o) |
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|
155 |
: m_ptr (o.m_ptr), |
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|
156 |
m_count (o.m_count) |
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|
157 |
{ |
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|
158 |
if (m_ptr != 0) |
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|
159 |
{ |
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|
160 |
(*m_count)++; |
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|
161 |
} |
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|
162 |
} |
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|
163 |
|
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|
164 |
template <typename T> |
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|
165 |
Ptr<T>::~Ptr () |
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|
166 |
{ |
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|
167 |
if (m_ptr != 0) |
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parents:
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|
168 |
{ |
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|
169 |
(*m_count)--; |
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|
170 |
if ((*m_count) == 0) |
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parents:
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|
171 |
{ |
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
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|
172 |
delete m_ptr; |
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parents:
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|
173 |
Ptr::DeallocCount (m_count); |
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parents:
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changeset
|
174 |
} |
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parents:
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|
175 |
} |
80f1c6b76999
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parents:
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changeset
|
176 |
} |
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
177 |
|
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initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
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changeset
|
178 |
template <typename T> |
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parents:
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|
179 |
Ptr<T> & |
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parents:
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|
180 |
Ptr<T>::operator = (Ptr const& o) |
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
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|
181 |
{ |
80f1c6b76999
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parents:
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|
182 |
if (o.m_ptr != 0) |
80f1c6b76999
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
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|
183 |
{ |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
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|
184 |
(*(o.m_count))++; |
80f1c6b76999
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
185 |
} |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
186 |
if (m_ptr != 0) |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
187 |
{ |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
188 |
(*m_count)--; |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
189 |
if ((*m_count) == 0) |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
190 |
{ |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
191 |
delete m_ptr; |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
192 |
Ptr::DeallocCount (m_count); |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
193 |
} |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
194 |
} |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
195 |
m_ptr = o.m_ptr; |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
196 |
m_count = o.m_count; |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
197 |
return *this; |
80f1c6b76999
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
198 |
} |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
199 |
|
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
200 |
template <typename T> |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
201 |
T * |
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initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
202 |
Ptr<T>::operator -> () |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
203 |
{ |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
204 |
return m_ptr; |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
205 |
} |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
206 |
|
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
207 |
template <typename T> |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
208 |
T * |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
209 |
Ptr<T>::operator -> () const |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
210 |
{ |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
211 |
return m_ptr; |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
212 |
} |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
213 |
|
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
214 |
template <typename T> |
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
215 |
bool |
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initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
216 |
Ptr<T>::operator! () |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
217 |
{ |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
218 |
return m_ptr == 0; |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
219 |
} |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
220 |
|
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
221 |
template <typename T> |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
222 |
Ptr<T>::operator Tester * () const |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
223 |
{ |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
224 |
if (m_ptr == 0) |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
225 |
{ |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
226 |
return 0; |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
227 |
} |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
228 |
static Tester test; |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
229 |
return &test; |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
230 |
} |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
231 |
|
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
232 |
template <typename T> |
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
233 |
T * |
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initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
234 |
Ptr<T>::Remove (void) |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
235 |
{ |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
236 |
assert (m_ptr.m_count == 1); |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
237 |
T *retval = m_ptr; |
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initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
238 |
m_ptr = 0; |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
239 |
return retval; |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
240 |
} |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
241 |
|
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
242 |
// non-member friend functions. |
80f1c6b76999
initial go at smart pointer implementation
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
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template <typename T1, typename T2> |
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bool |
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operator == (Ptr<T1> const &lhs, T2 const *rhs) |
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{ |
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return lhs.m_ptr == rhs; |
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} |
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template <typename T1, typename T2> |
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bool |
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operator == (T1 const *lhs, Ptr<T2> &rhs) |
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{ |
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return lhs == rhs.m_ptr; |
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} |
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template <typename T1, typename T2> |
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bool |
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operator != (Ptr<T1> const &lhs, T2 const *rhs) |
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{ |
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return lhs.m_ptr != rhs; |
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} |
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template <typename T1, typename T2> |
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bool |
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operator != (T1 const *lhs, Ptr<T2> &rhs) |
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{ |
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return lhs != rhs.m_ptr; |
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} |
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}; // namespace ns3 |
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|
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#endif /* PTR_H */ |