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67<h1>shared_ptr.h</h1><a href="shared__ptr_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001
68<a name="l00013"></a>00013 <span class="preprocessor">#ifndef shared_ptr_h</span>
69<a name="l00014"></a>00014 <span class="preprocessor"></span><span class="preprocessor">#define shared_ptr_h</span>
70<a name="l00015"></a>00015 <span class="preprocessor"></span>
71<a name="l00016"></a>00016 <span class="preprocessor">#include &lt;limits.h&gt;</span>
72<a name="l00017"></a>00017 <span class="preprocessor">#include &lt;algorithm&gt;</span>
73<a name="l00018"></a>00018 <span class="preprocessor">#include &lt;stdexcept&gt;</span>
74<a name="l00019"></a>00019 <span class="preprocessor">#include &lt;string&gt;</span>
75<a name="l00020"></a>00020 <span class="preprocessor">#include &quot;<a class="code" href="bdmerror_8h.html" title="BDM&amp;#39;s exception-throwing macros.">bdmerror.h</a>&quot;</span>
76<a name="l00021"></a>00021
77<a name="l00022"></a>00022 <span class="keyword">namespace </span>bdm {
78<a name="l00023"></a>00023
79<a name="l00033"></a>00033 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;
80<a name="l00034"></a><a class="code" href="classbdm_1_1shared__ptr.html">00034</a> <span class="keyword">class </span><a class="code" href="classbdm_1_1shared__ptr.html" title="A naive implementation of roughly a subset of the std::tr1::shared_ptr spec.">shared_ptr</a> {
81<a name="l00035"></a>00035         <span class="keyword">template</span>&lt;<span class="keyword">class</span> U&gt; <span class="keyword">friend</span> <span class="keyword">class </span><a class="code" href="classbdm_1_1shared__ptr.html" title="A naive implementation of roughly a subset of the std::tr1::shared_ptr spec.">shared_ptr</a>;
82<a name="l00036"></a>00036
83<a name="l00037"></a>00037 <span class="keyword">private</span>:
84<a name="l00038"></a>00038         T *payload;
85<a name="l00039"></a>00039         <span class="keywordtype">unsigned</span> *refCnt;
86<a name="l00040"></a>00040
87<a name="l00041"></a>00041 <span class="keyword">public</span>:
88<a name="l00047"></a><a class="code" href="classbdm_1_1shared__ptr.html#a66a4d41031e37618f1a9bb3c81814c11">00047</a>         <a class="code" href="classbdm_1_1shared__ptr.html#a66a4d41031e37618f1a9bb3c81814c11" title="Default constructor.">shared_ptr</a>() :
89<a name="l00048"></a>00048                         payload ( 0 ),
90<a name="l00049"></a>00049                         refCnt ( 0 ) {
91<a name="l00050"></a>00050         }
92<a name="l00051"></a>00051
93<a name="l00058"></a><a class="code" href="classbdm_1_1shared__ptr.html#ac8b7f0a813173581530c80d7ac4fc7c2">00058</a>         <a class="code" href="classbdm_1_1shared__ptr.html#a66a4d41031e37618f1a9bb3c81814c11" title="Default constructor.">shared_ptr</a> ( T *p ) :
94<a name="l00059"></a>00059                         payload ( p ),
95<a name="l00060"></a>00060                         refCnt ( p ? new unsigned ( 1 ) : 0 ) {
96<a name="l00061"></a>00061         }
97<a name="l00062"></a>00062
98<a name="l00069"></a><a class="code" href="classbdm_1_1shared__ptr.html#a357702d12bfd608a08b46e4a194aa4b5">00069</a>         <a class="code" href="classbdm_1_1shared__ptr.html#a66a4d41031e37618f1a9bb3c81814c11" title="Default constructor.">shared_ptr</a> ( <span class="keyword">const</span> <a class="code" href="classbdm_1_1shared__ptr.html" title="A naive implementation of roughly a subset of the std::tr1::shared_ptr spec.">shared_ptr&lt;T&gt;</a> &amp;other ) :
99<a name="l00070"></a>00070                         payload ( other.payload ),
100<a name="l00071"></a>00071                         refCnt ( other.refCnt ) {
101<a name="l00072"></a>00072                 add_ref();
102<a name="l00073"></a>00073         }
103<a name="l00074"></a>00074
104<a name="l00084"></a>00084         <span class="keyword">template</span>&lt;<span class="keyword">typename</span> U&gt;
105<a name="l00085"></a><a class="code" href="classbdm_1_1shared__ptr.html#aaffa5b17385493f4102c52cf75d3b509">00085</a>         <a class="code" href="classbdm_1_1shared__ptr.html#a66a4d41031e37618f1a9bb3c81814c11" title="Default constructor.">shared_ptr</a> ( <span class="keyword">const</span> <a class="code" href="classbdm_1_1shared__ptr.html" title="A naive implementation of roughly a subset of the std::tr1::shared_ptr spec.">shared_ptr&lt;U&gt;</a> &amp;other ) :
106<a name="l00086"></a>00086                         payload ( other.payload ),
107<a name="l00087"></a>00087                         refCnt ( other.refCnt ) {
108<a name="l00088"></a>00088                 add_ref();
109<a name="l00089"></a>00089         }
110<a name="l00090"></a>00090
111<a name="l00094"></a><a class="code" href="classbdm_1_1shared__ptr.html#a79374842e417d2f64e449e374be4cfc1">00094</a>         <a class="code" href="classbdm_1_1shared__ptr.html#a79374842e417d2f64e449e374be4cfc1">~shared_ptr</a>() {
112<a name="l00095"></a>00095                 del_ref();
113<a name="l00096"></a>00096         }
114<a name="l00097"></a>00097
115<a name="l00101"></a><a class="code" href="classbdm_1_1shared__ptr.html#a55263b1c8efbd3f8fddf703e2c457f6c">00101</a>         <a class="code" href="classbdm_1_1shared__ptr.html" title="A naive implementation of roughly a subset of the std::tr1::shared_ptr spec.">shared_ptr&lt;T&gt;</a> &amp;<a class="code" href="classbdm_1_1shared__ptr.html#a55263b1c8efbd3f8fddf703e2c457f6c" title="Assignment operator.">operator= </a>( <span class="keyword">const</span> <a class="code" href="classbdm_1_1shared__ptr.html" title="A naive implementation of roughly a subset of the std::tr1::shared_ptr spec.">shared_ptr&lt;T&gt;</a> &amp;other ) {
116<a name="l00102"></a>00102                 other.add_ref();
117<a name="l00103"></a>00103                 del_ref();
118<a name="l00104"></a>00104
119<a name="l00105"></a>00105                 payload = other.payload;
120<a name="l00106"></a>00106                 refCnt = other.refCnt;
121<a name="l00107"></a>00107
122<a name="l00108"></a>00108                 <span class="keywordflow">return</span> *<span class="keyword">this</span>;
123<a name="l00109"></a>00109         }
124<a name="l00110"></a>00110
125<a name="l00115"></a><a class="code" href="classbdm_1_1shared__ptr.html#a37ebcfb6750dd7b5630f1d2354c07a96">00115</a>         T *<span class="keyword">get</span>() {
126<a name="l00116"></a>00116                 <span class="keywordflow">return</span> payload;
127<a name="l00117"></a>00117         }
128<a name="l00118"></a>00118
129<a name="l00124"></a><a class="code" href="classbdm_1_1shared__ptr.html#abcaae812868eacbad050beda465d2327">00124</a>         T *<a class="code" href="classbdm_1_1shared__ptr.html#abcaae812868eacbad050beda465d2327">operator-&gt;</a>() {
130<a name="l00125"></a>00125                 <span class="keywordflow">if</span> ( !payload) {abort();};<span class="comment">// &quot;dereferencing NULL&quot; );</span>
131<a name="l00126"></a>00126                 <span class="keywordflow">return</span> payload;
132<a name="l00127"></a>00127         }
133<a name="l00128"></a>00128
134<a name="l00132"></a><a class="code" href="classbdm_1_1shared__ptr.html#ade38de837267becf5eed2839fea42c45">00132</a>         T &amp;<a class="code" href="classbdm_1_1shared__ptr.html#ade38de837267becf5eed2839fea42c45">operator*</a>() {
135<a name="l00133"></a>00133                 <a class="code" href="bdmerror_8h.html#a89a0f906b242b79c5d3d342291b2cab4" title="Throw std::runtime_exception if t is not true and NDEBUG is not defined.">bdm_assert_debug</a> ( payload, <span class="stringliteral">&quot;dereferencing NULL&quot;</span> );
136<a name="l00134"></a>00134                 <span class="keywordflow">return</span> *payload;
137<a name="l00135"></a>00135         }
138<a name="l00136"></a>00136
139<a name="l00141"></a><a class="code" href="classbdm_1_1shared__ptr.html#afff45e4841b2921cd42ce0691f8c1196">00141</a>         <span class="keyword">const</span> T* <span class="keyword">get</span>() <span class="keyword">const</span> {
140<a name="l00142"></a>00142                 <span class="keywordflow">return</span> payload;
141<a name="l00143"></a>00143         }
142<a name="l00144"></a>00144
143<a name="l00148"></a><a class="code" href="classbdm_1_1shared__ptr.html#ad89ec7ceb318241d833c7d278444396d">00148</a>         <span class="keyword">const</span> T *<a class="code" href="classbdm_1_1shared__ptr.html#ad89ec7ceb318241d833c7d278444396d">operator-&gt;</a>()<span class="keyword"> const </span>{
144<a name="l00149"></a>00149                 <a class="code" href="bdmerror_8h.html#a89a0f906b242b79c5d3d342291b2cab4" title="Throw std::runtime_exception if t is not true and NDEBUG is not defined.">bdm_assert_debug</a> ( payload, <span class="stringliteral">&quot;dereferencing NULL&quot;</span> );
145<a name="l00150"></a>00150                 <span class="keywordflow">return</span> payload;
146<a name="l00151"></a>00151         }
147<a name="l00152"></a>00152
148<a name="l00156"></a><a class="code" href="classbdm_1_1shared__ptr.html#ade000a72fe73804aa26962432f264800">00156</a>         <span class="keyword">const</span> T &amp;<a class="code" href="classbdm_1_1shared__ptr.html#ade000a72fe73804aa26962432f264800">operator*</a>()<span class="keyword"> const </span>{
149<a name="l00157"></a>00157                 <a class="code" href="bdmerror_8h.html#a89a0f906b242b79c5d3d342291b2cab4" title="Throw std::runtime_exception if t is not true and NDEBUG is not defined.">bdm_assert_debug</a> ( payload, <span class="stringliteral">&quot;dereferencing NULL&quot;</span> );
150<a name="l00158"></a>00158                 <span class="keywordflow">return</span> *payload;
151<a name="l00159"></a>00159         }
152<a name="l00160"></a>00160
153<a name="l00162"></a><a class="code" href="classbdm_1_1shared__ptr.html#a338dbc6aa9fd95175abdc2df3ae2c284">00162</a>         <span class="keywordtype">bool</span> <a class="code" href="classbdm_1_1shared__ptr.html#a338dbc6aa9fd95175abdc2df3ae2c284" title="Returns use_count() == 1.">unique</a>()<span class="keyword"> const </span>{
154<a name="l00163"></a>00163                 <span class="keywordflow">return</span> refCnt &amp;&amp; ( *refCnt == 1 );
155<a name="l00164"></a>00164         }
156<a name="l00165"></a>00165
157<a name="l00171"></a><a class="code" href="classbdm_1_1shared__ptr.html#a8e52b8887a4408c52b5263a5717343f2">00171</a>         <span class="keywordtype">long</span> <a class="code" href="classbdm_1_1shared__ptr.html#a8e52b8887a4408c52b5263a5717343f2">use_count</a>()<span class="keyword"> const </span>{
158<a name="l00172"></a>00172                 <span class="keywordflow">return</span> refCnt ? *refCnt : 0;
159<a name="l00173"></a>00173         }
160<a name="l00174"></a>00174
161<a name="l00180"></a><a class="code" href="classbdm_1_1shared__ptr.html#a6cac71bb600f9f7c6fbed9335fd22d37">00180</a>         <a class="code" href="classbdm_1_1shared__ptr.html#a6cac71bb600f9f7c6fbed9335fd22d37" title="Boolean cast.">operator bool</a>()<span class="keyword"> const </span>{
162<a name="l00181"></a>00181                 <span class="keywordflow">return</span> !!payload;
163<a name="l00182"></a>00182         }
164<a name="l00183"></a>00183
165<a name="l00190"></a>00190         <span class="keyword">template</span>&lt;<span class="keyword">typename</span> U&gt;
166<a name="l00191"></a><a class="code" href="classbdm_1_1shared__ptr.html#ab3cd369b00369ab92456aa0645e8d560">00191</a>         <a class="code" href="classbdm_1_1shared__ptr.html#ab3cd369b00369ab92456aa0645e8d560" title="const cast">operator shared_ptr&lt;const U&gt;</a>()<span class="keyword"> const </span>{
167<a name="l00192"></a>00192                 <a class="code" href="classbdm_1_1shared__ptr.html" title="A naive implementation of roughly a subset of the std::tr1::shared_ptr spec.">shared_ptr&lt;const U&gt;</a> cptr;               
168<a name="l00193"></a>00193                 cptr.refCnt = refCnt;
169<a name="l00194"></a>00194                 cptr.payload = payload;
170<a name="l00195"></a>00195                 add_ref();
171<a name="l00196"></a>00196                 <span class="keywordflow">return</span> cptr;
172<a name="l00197"></a>00197         }
173<a name="l00198"></a>00198
174<a name="l00202"></a><a class="code" href="classbdm_1_1shared__ptr.html#afca7fd588f8de50e7590357305b00984">00202</a>         <span class="keywordtype">void</span> <a class="code" href="classbdm_1_1shared__ptr.html#afca7fd588f8de50e7590357305b00984" title="Efficient swap for shared_ptr.">swap</a> ( <a class="code" href="classbdm_1_1shared__ptr.html" title="A naive implementation of roughly a subset of the std::tr1::shared_ptr spec.">shared_ptr</a> &amp;other ) {
175<a name="l00203"></a>00203                 <a class="code" href="classbdm_1_1shared__ptr.html#afca7fd588f8de50e7590357305b00984" title="Efficient swap for shared_ptr.">std::swap</a> ( payload, other.payload );
176<a name="l00204"></a>00204                 <a class="code" href="classbdm_1_1shared__ptr.html#afca7fd588f8de50e7590357305b00984" title="Efficient swap for shared_ptr.">std::swap</a> ( refCnt, other.refCnt );
177<a name="l00205"></a>00205         }
178<a name="l00206"></a>00206
179<a name="l00207"></a>00207 <span class="keyword">private</span>:
180<a name="l00208"></a>00208         <span class="keywordtype">void</span> add_ref()<span class="keyword"> const </span>{
181<a name="l00209"></a>00209                 <span class="keywordflow">if</span> ( refCnt ) {
182<a name="l00210"></a>00210                         <span class="keywordflow">if</span> ( *refCnt == UINT_MAX ) {
183<a name="l00211"></a>00211                                 <span class="keywordflow">throw</span> std::overflow_error (
184<a name="l00212"></a>00212                                     std::string ( <span class="stringliteral">&quot;Shared pointer has too many references.&quot;</span> ) );
185<a name="l00213"></a>00213                         }
186<a name="l00214"></a>00214
187<a name="l00215"></a>00215                         ++*refCnt;
188<a name="l00216"></a>00216                 }
189<a name="l00217"></a>00217         }
190<a name="l00218"></a>00218
191<a name="l00219"></a>00219         <span class="keywordtype">void</span> del_ref() {
192<a name="l00220"></a>00220                 <span class="keywordflow">if</span> ( refCnt ) {
193<a name="l00221"></a>00221                         <span class="keywordflow">if</span> ( ! ( --*refCnt ) ) {
194<a name="l00222"></a>00222                                 <span class="keyword">delete</span> payload;
195<a name="l00223"></a>00223                                 <span class="keyword">delete</span> refCnt;
196<a name="l00224"></a>00224                         }
197<a name="l00225"></a>00225                 }
198<a name="l00226"></a>00226         }
199<a name="l00227"></a>00227 };
200<a name="l00228"></a>00228
201<a name="l00230"></a>00230 <span class="keyword">template</span>&lt;<span class="keyword">typename</span> T, <span class="keyword">typename</span> U&gt;
202<a name="l00231"></a>00231 <span class="keywordtype">bool</span> operator== ( shared_ptr&lt;T&gt; <span class="keyword">const</span> &amp;a, shared_ptr&lt;U&gt; <span class="keyword">const</span> &amp;b ) {
203<a name="l00232"></a>00232         <span class="keywordflow">return</span> a.get() == b.get();
204<a name="l00233"></a>00233 }
205<a name="l00234"></a>00234
206<a name="l00236"></a>00236 <span class="keyword">template</span>&lt;<span class="keyword">typename</span> T, <span class="keyword">typename</span> U&gt;
207<a name="l00237"></a>00237 <span class="keywordtype">bool</span> operator!= ( shared_ptr&lt;T&gt; <span class="keyword">const</span> &amp;a, shared_ptr&lt;U&gt; <span class="keyword">const</span> &amp;b ) {
208<a name="l00238"></a>00238         <span class="keywordflow">return</span> a.get() != b.get();
209<a name="l00239"></a>00239 }
210<a name="l00240"></a>00240
211<a name="l00242"></a>00242 <span class="keyword">template</span>&lt;<span class="keyword">typename</span> T, <span class="keyword">typename</span> U&gt;
212<a name="l00243"></a>00243 <span class="keywordtype">bool</span> operator&lt; ( shared_ptr&lt;T&gt; <span class="keyword">const</span> &amp;a, shared_ptr&lt;U&gt; <span class="keyword">const</span> &amp;b ) {
213<a name="l00244"></a>00244         <span class="keywordflow">return</span> a.get() &lt; b.get();
214<a name="l00245"></a>00245 }
215<a name="l00246"></a>00246
216<a name="l00254"></a>00254 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;
217<a name="l00255"></a><a class="code" href="classbdm_1_1object__ptr.html">00255</a> <span class="keyword">class </span><a class="code" href="classbdm_1_1object__ptr.html" title="A wrapper of shared_ptr which is never empty.">object_ptr</a> : <span class="keyword">public</span> <a class="code" href="classbdm_1_1shared__ptr.html" title="A naive implementation of roughly a subset of the std::tr1::shared_ptr spec.">shared_ptr</a>&lt;T&gt;
218<a name="l00256"></a>00256 {
219<a name="l00257"></a>00257 <span class="keyword">public</span>:
220<a name="l00263"></a><a class="code" href="classbdm_1_1object__ptr.html#a9f1016ff2bbfa497d1cc0a4497c1fba4">00263</a>         <a class="code" href="classbdm_1_1object__ptr.html#a9f1016ff2bbfa497d1cc0a4497c1fba4" title="Default constructor.">object_ptr</a>() : <a class="code" href="classbdm_1_1shared__ptr.html" title="A naive implementation of roughly a subset of the std::tr1::shared_ptr spec.">shared_ptr</a>&lt;T&gt; ( new T() ) { }
221<a name="l00264"></a>00264
222<a name="l00270"></a><a class="code" href="classbdm_1_1object__ptr.html#adcb20017177c98274c16087b2c0067dc">00270</a>         <a class="code" href="classbdm_1_1object__ptr.html#adcb20017177c98274c16087b2c0067dc" title="Upcast from shared_ptr&amp;lt;T&amp;gt; to object_ptr&amp;lt;T&amp;gt;.">object_ptr</a> ( <span class="keyword">const</span> <a class="code" href="classbdm_1_1shared__ptr.html" title="A naive implementation of roughly a subset of the std::tr1::shared_ptr spec.">shared_ptr&lt;T&gt;</a> &amp;b ) : <a class="code" href="classbdm_1_1shared__ptr.html" title="A naive implementation of roughly a subset of the std::tr1::shared_ptr spec.">shared_ptr</a>&lt;T&gt; ( b ) {
223<a name="l00271"></a>00271                 <a class="code" href="bdmerror_8h.html#a89a0f906b242b79c5d3d342291b2cab4" title="Throw std::runtime_exception if t is not true and NDEBUG is not defined.">bdm_assert_debug</a> ( this-&gt;<span class="keyword">get</span>(), <span class="stringliteral">&quot;object_ptr cannot be empty&quot;</span> );
224<a name="l00272"></a>00272         }
225<a name="l00273"></a>00273
226<a name="l00278"></a><a class="code" href="classbdm_1_1object__ptr.html#aa9eb00600d8640711eadeed98c7892e9">00278</a>         <a class="code" href="classbdm_1_1object__ptr.html#aa9eb00600d8640711eadeed98c7892e9">object_ptr</a> ( T *p ) : <a class="code" href="classbdm_1_1shared__ptr.html" title="A naive implementation of roughly a subset of the std::tr1::shared_ptr spec.">shared_ptr</a>&lt;T&gt; ( p ) {
227<a name="l00279"></a>00279                 <a class="code" href="bdmerror_8h.html#a89a0f906b242b79c5d3d342291b2cab4" title="Throw std::runtime_exception if t is not true and NDEBUG is not defined.">bdm_assert_debug</a> ( p, <span class="stringliteral">&quot;object_ptr cannot be empty&quot;</span> );
228<a name="l00280"></a>00280         }
229<a name="l00281"></a>00281
230<a name="l00285"></a><a class="code" href="classbdm_1_1object__ptr.html#a9c80da05b7b3dfc59333ca9bf6f62970">00285</a>         <a class="code" href="classbdm_1_1object__ptr.html" title="A wrapper of shared_ptr which is never empty.">object_ptr&lt;T&gt;</a> &amp;<a class="code" href="classbdm_1_1object__ptr.html#a9c80da05b7b3dfc59333ca9bf6f62970" title="Assignment operator.">operator= </a>( <span class="keyword">const</span> <a class="code" href="classbdm_1_1object__ptr.html" title="A wrapper of shared_ptr which is never empty.">object_ptr&lt;T&gt;</a> &amp;other ) {
231<a name="l00286"></a>00286                 <a class="code" href="classbdm_1_1object__ptr.html#a9c80da05b7b3dfc59333ca9bf6f62970" title="Assignment operator.">shared_ptr&lt;T&gt;::operator= </a>( other );
232<a name="l00287"></a>00287                 <span class="keywordflow">return</span> *<span class="keyword">this</span>;
233<a name="l00288"></a>00288         }
234<a name="l00289"></a>00289 };
235<a name="l00290"></a>00290
236<a name="l00291"></a>00291 <span class="preprocessor">#define SHAREDPTR(class_name) typedef bdm::object_ptr&lt; class_name &gt; class_name##_ptr</span>
237<a name="l00292"></a>00292 <span class="preprocessor"></span>
238<a name="l00293"></a>00293 <span class="preprocessor">#define SHAREDPTR2(template_class_name, template_parameter_name) typedef bdm::object_ptr&lt; template_class_name &lt; template_parameter_name &gt; &gt; template_class_name##_##template_parameter_name##_ptr</span>
239<a name="l00294"></a>00294 <span class="preprocessor"></span>
240<a name="l00295"></a>00295 }
241<a name="l00296"></a>00296
242<a name="l00297"></a>00297 <span class="preprocessor">#endif</span>
243</pre></div></div>
244<hr size="1"/><address style="text-align: right;"><small>Generated on Thu Oct 15 00:07:48 2009 for mixpp by&nbsp;
245<a href="http://www.doxygen.org/index.html">
246<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.6.1 </small></address>
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