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64<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
65<a name="l00013"></a>00013 <span class="preprocessor">#ifndef shared_ptr_h</span>
66<a name="l00014"></a>00014 <span class="preprocessor"></span><span class="preprocessor">#define shared_ptr_h</span>
67<a name="l00015"></a>00015 <span class="preprocessor"></span>
68<a name="l00016"></a>00016 <span class="preprocessor">#include &lt;limits.h&gt;</span>
69<a name="l00017"></a>00017 <span class="preprocessor">#include &lt;algorithm&gt;</span>
70<a name="l00018"></a>00018 <span class="preprocessor">#include &lt;stdexcept&gt;</span>
71<a name="l00019"></a>00019 <span class="preprocessor">#include &lt;string&gt;</span>
[651]72<a name="l00020"></a>00020 <span class="preprocessor">#include "<a class="code" href="bdmerror_8h.html" title="BDM&amp;#39;s exception-throwing macros.">bdmerror.h</a>"</span>
[472]73<a name="l00021"></a>00021
74<a name="l00022"></a>00022 <span class="keyword">namespace </span>bdm {
75<a name="l00023"></a>00023
[591]76<a name="l00033"></a>00033 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;
77<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> {
78<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>;
79<a name="l00036"></a>00036
80<a name="l00037"></a>00037 <span class="keyword">private</span>:
81<a name="l00038"></a>00038         T *payload;
82<a name="l00039"></a>00039         <span class="keywordtype">unsigned</span> *refCnt;
83<a name="l00040"></a>00040
84<a name="l00041"></a>00041 <span class="keyword">public</span>:
[651]85<a name="l00047"></a><a class="code" href="classbdm_1_1shared__ptr.html#66a4d41031e37618f1a9bb3c81814c11">00047</a>         <a class="code" href="classbdm_1_1shared__ptr.html#66a4d41031e37618f1a9bb3c81814c11" title="Default constructor.">shared_ptr</a>() :
[591]86<a name="l00048"></a>00048                         payload ( 0 ),
87<a name="l00049"></a>00049                         refCnt ( 0 ) {
88<a name="l00050"></a>00050         }
89<a name="l00051"></a>00051
[651]90<a name="l00058"></a><a class="code" href="classbdm_1_1shared__ptr.html#c8b7f0a813173581530c80d7ac4fc7c2">00058</a>         <a class="code" href="classbdm_1_1shared__ptr.html#66a4d41031e37618f1a9bb3c81814c11" title="Default constructor.">shared_ptr</a> ( T *p ) :
[591]91<a name="l00059"></a>00059                         payload ( p ),
92<a name="l00060"></a>00060                         refCnt ( p ? new unsigned ( 1 ) : 0 ) {
93<a name="l00061"></a>00061         }
94<a name="l00062"></a>00062
[651]95<a name="l00069"></a><a class="code" href="classbdm_1_1shared__ptr.html#357702d12bfd608a08b46e4a194aa4b5">00069</a>         <a class="code" href="classbdm_1_1shared__ptr.html#66a4d41031e37618f1a9bb3c81814c11" title="Default constructor.">shared_ptr</a> ( <span class="keyword">const</span> <a class="code" href="classbdm_1_1shared__ptr.html">shared_ptr&lt;T&gt;</a> &amp;other ) :
[591]96<a name="l00070"></a>00070                         payload ( other.payload ),
97<a name="l00071"></a>00071                         refCnt ( other.refCnt ) {
98<a name="l00072"></a>00072                 add_ref();
99<a name="l00073"></a>00073         }
100<a name="l00074"></a>00074
101<a name="l00084"></a>00084         <span class="keyword">template</span>&lt;<span class="keyword">typename</span> U&gt;
[651]102<a name="l00085"></a><a class="code" href="classbdm_1_1shared__ptr.html#affa5b17385493f4102c52cf75d3b509">00085</a>         <a class="code" href="classbdm_1_1shared__ptr.html#66a4d41031e37618f1a9bb3c81814c11" 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 ) :
[591]103<a name="l00086"></a>00086                         payload ( other.payload ),
104<a name="l00087"></a>00087                         refCnt ( other.refCnt ) {
105<a name="l00088"></a>00088                 add_ref();
106<a name="l00089"></a>00089         }
107<a name="l00090"></a>00090
[651]108<a name="l00094"></a><a class="code" href="classbdm_1_1shared__ptr.html#79374842e417d2f64e449e374be4cfc1">00094</a>         <a class="code" href="classbdm_1_1shared__ptr.html#79374842e417d2f64e449e374be4cfc1">~shared_ptr</a>() {
[591]109<a name="l00095"></a>00095                 del_ref();
110<a name="l00096"></a>00096         }
111<a name="l00097"></a>00097
[651]112<a name="l00101"></a><a class="code" href="classbdm_1_1shared__ptr.html#55263b1c8efbd3f8fddf703e2c457f6c">00101</a>         <a class="code" href="classbdm_1_1shared__ptr.html">shared_ptr&lt;T&gt;</a> &amp;<a class="code" href="classbdm_1_1shared__ptr.html#55263b1c8efbd3f8fddf703e2c457f6c" title="Assignment operator.">operator= </a>( <span class="keyword">const</span> <a class="code" href="classbdm_1_1shared__ptr.html">shared_ptr&lt;T&gt;</a> &amp;other ) {
[591]113<a name="l00102"></a>00102                 other.add_ref();
114<a name="l00103"></a>00103                 del_ref();
115<a name="l00104"></a>00104
116<a name="l00105"></a>00105                 payload = other.payload;
117<a name="l00106"></a>00106                 refCnt = other.refCnt;
118<a name="l00107"></a>00107
119<a name="l00108"></a>00108                 <span class="keywordflow">return</span> *<span class="keyword">this</span>;
120<a name="l00109"></a>00109         }
121<a name="l00110"></a>00110
[651]122<a name="l00115"></a><a class="code" href="classbdm_1_1shared__ptr.html#37ebcfb6750dd7b5630f1d2354c07a96">00115</a>         T *<span class="keyword">get</span>() {
[591]123<a name="l00116"></a>00116                 <span class="keywordflow">return</span> payload;
124<a name="l00117"></a>00117         }
125<a name="l00118"></a>00118
[651]126<a name="l00124"></a><a class="code" href="classbdm_1_1shared__ptr.html#bcaae812868eacbad050beda465d2327">00124</a>         T *<a class="code" href="classbdm_1_1shared__ptr.html#bcaae812868eacbad050beda465d2327">operator-&gt;</a>() {
127<a name="l00125"></a>00125                 <span class="keywordflow">if</span> ( !payload) {abort();};<span class="comment">// "dereferencing NULL" );</span>
[591]128<a name="l00126"></a>00126                 <span class="keywordflow">return</span> payload;
129<a name="l00127"></a>00127         }
130<a name="l00128"></a>00128
[651]131<a name="l00132"></a><a class="code" href="classbdm_1_1shared__ptr.html#de38de837267becf5eed2839fea42c45">00132</a>         T &amp;<a class="code" href="classbdm_1_1shared__ptr.html#de38de837267becf5eed2839fea42c45">operator*</a>() {
132<a name="l00133"></a>00133                 <a class="code" href="bdmerror_8h.html#89a0f906b242b79c5d3d342291b2cab4" title="Throw std::runtime_exception if t is not true and NDEBUG is not defined.">bdm_assert_debug</a> ( payload, <span class="stringliteral">"dereferencing NULL"</span> );
[591]133<a name="l00134"></a>00134                 <span class="keywordflow">return</span> *payload;
134<a name="l00135"></a>00135         }
[472]135<a name="l00136"></a>00136
[651]136<a name="l00141"></a><a class="code" href="classbdm_1_1shared__ptr.html#fff45e4841b2921cd42ce0691f8c1196">00141</a>         <span class="keyword">const</span> T* <span class="keyword">get</span>() <span class="keyword">const</span> {
[591]137<a name="l00142"></a>00142                 <span class="keywordflow">return</span> payload;
138<a name="l00143"></a>00143         }
139<a name="l00144"></a>00144
[651]140<a name="l00148"></a><a class="code" href="classbdm_1_1shared__ptr.html#d89ec7ceb318241d833c7d278444396d">00148</a>         <span class="keyword">const</span> T *<a class="code" href="classbdm_1_1shared__ptr.html#d89ec7ceb318241d833c7d278444396d">operator-&gt;</a>()<span class="keyword"> const </span>{
141<a name="l00149"></a>00149                 <a class="code" href="bdmerror_8h.html#89a0f906b242b79c5d3d342291b2cab4" title="Throw std::runtime_exception if t is not true and NDEBUG is not defined.">bdm_assert_debug</a> ( payload, <span class="stringliteral">"dereferencing NULL"</span> );
[591]142<a name="l00150"></a>00150                 <span class="keywordflow">return</span> payload;
143<a name="l00151"></a>00151         }
[472]144<a name="l00152"></a>00152
[651]145<a name="l00156"></a><a class="code" href="classbdm_1_1shared__ptr.html#de000a72fe73804aa26962432f264800">00156</a>         <span class="keyword">const</span> T &amp;<a class="code" href="classbdm_1_1shared__ptr.html#de000a72fe73804aa26962432f264800">operator*</a>()<span class="keyword"> const </span>{
146<a name="l00157"></a>00157                 <a class="code" href="bdmerror_8h.html#89a0f906b242b79c5d3d342291b2cab4" title="Throw std::runtime_exception if t is not true and NDEBUG is not defined.">bdm_assert_debug</a> ( payload, <span class="stringliteral">"dereferencing NULL"</span> );
[591]147<a name="l00158"></a>00158                 <span class="keywordflow">return</span> *payload;
148<a name="l00159"></a>00159         }
149<a name="l00160"></a>00160
[651]150<a name="l00162"></a><a class="code" href="classbdm_1_1shared__ptr.html#338dbc6aa9fd95175abdc2df3ae2c284">00162</a>         <span class="keywordtype">bool</span> <a class="code" href="classbdm_1_1shared__ptr.html#338dbc6aa9fd95175abdc2df3ae2c284" title="Returns use_count() == 1.">unique</a>()<span class="keyword"> const </span>{
[591]151<a name="l00163"></a>00163                 <span class="keywordflow">return</span> refCnt &amp;&amp; ( *refCnt == 1 );
152<a name="l00164"></a>00164         }
[472]153<a name="l00165"></a>00165
[651]154<a name="l00171"></a><a class="code" href="classbdm_1_1shared__ptr.html#8e52b8887a4408c52b5263a5717343f2">00171</a>         <span class="keywordtype">long</span> <a class="code" href="classbdm_1_1shared__ptr.html#8e52b8887a4408c52b5263a5717343f2">use_count</a>()<span class="keyword"> const </span>{
[591]155<a name="l00172"></a>00172                 <span class="keywordflow">return</span> refCnt ? *refCnt : 0;
[472]156<a name="l00173"></a>00173         }
[591]157<a name="l00174"></a>00174
[651]158<a name="l00180"></a><a class="code" href="classbdm_1_1shared__ptr.html#6cac71bb600f9f7c6fbed9335fd22d37">00180</a>         <a class="code" href="classbdm_1_1shared__ptr.html#6cac71bb600f9f7c6fbed9335fd22d37" title="Boolean cast.">operator bool</a>()<span class="keyword"> const </span>{
[591]159<a name="l00181"></a>00181                 <span class="keywordflow">return</span> !!payload;
160<a name="l00182"></a>00182         }
161<a name="l00183"></a>00183
162<a name="l00190"></a>00190         <span class="keyword">template</span>&lt;<span class="keyword">typename</span> U&gt;
[651]163<a name="l00191"></a><a class="code" href="classbdm_1_1shared__ptr.html#b3cd369b00369ab92456aa0645e8d560">00191</a>         <a class="code" href="classbdm_1_1shared__ptr.html#b3cd369b00369ab92456aa0645e8d560" title="const cast">operator shared_ptr&lt;const U&gt;</a>()<span class="keyword"> const </span>{
[591]164<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;               
165<a name="l00193"></a>00193                 cptr.refCnt = refCnt;
166<a name="l00194"></a>00194                 cptr.payload = payload;
167<a name="l00195"></a>00195                 add_ref();
168<a name="l00196"></a>00196                 <span class="keywordflow">return</span> cptr;
169<a name="l00197"></a>00197         }
170<a name="l00198"></a>00198
[651]171<a name="l00202"></a><a class="code" href="classbdm_1_1shared__ptr.html#fca7fd588f8de50e7590357305b00984">00202</a>         <span class="keywordtype">void</span> <a class="code" href="classbdm_1_1shared__ptr.html#fca7fd588f8de50e7590357305b00984" 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 ) {
172<a name="l00203"></a>00203                 <a class="code" href="classbdm_1_1shared__ptr.html#fca7fd588f8de50e7590357305b00984" title="Efficient swap for shared_ptr.">std::swap</a> ( payload, other.payload );
173<a name="l00204"></a>00204                 <a class="code" href="classbdm_1_1shared__ptr.html#fca7fd588f8de50e7590357305b00984" title="Efficient swap for shared_ptr.">std::swap</a> ( refCnt, other.refCnt );
[591]174<a name="l00205"></a>00205         }
175<a name="l00206"></a>00206
176<a name="l00207"></a>00207 <span class="keyword">private</span>:
177<a name="l00208"></a>00208         <span class="keywordtype">void</span> add_ref()<span class="keyword"> const </span>{
178<a name="l00209"></a>00209                 <span class="keywordflow">if</span> ( refCnt ) {
179<a name="l00210"></a>00210                         <span class="keywordflow">if</span> ( *refCnt == UINT_MAX ) {
180<a name="l00211"></a>00211                                 <span class="keywordflow">throw</span> std::overflow_error (
[651]181<a name="l00212"></a>00212                                     std::string ( <span class="stringliteral">"Shared pointer has too many references."</span> ) );
[591]182<a name="l00213"></a>00213                         }
183<a name="l00214"></a>00214
184<a name="l00215"></a>00215                         ++*refCnt;
185<a name="l00216"></a>00216                 }
186<a name="l00217"></a>00217         }
187<a name="l00218"></a>00218
188<a name="l00219"></a>00219         <span class="keywordtype">void</span> del_ref() {
189<a name="l00220"></a>00220                 <span class="keywordflow">if</span> ( refCnt ) {
190<a name="l00221"></a>00221                         <span class="keywordflow">if</span> ( ! ( --*refCnt ) ) {
191<a name="l00222"></a>00222                                 <span class="keyword">delete</span> payload;
192<a name="l00223"></a>00223                                 <span class="keyword">delete</span> refCnt;
193<a name="l00224"></a>00224                         }
194<a name="l00225"></a>00225                 }
195<a name="l00226"></a>00226         }
196<a name="l00227"></a>00227 };
197<a name="l00228"></a>00228
198<a name="l00230"></a>00230 <span class="keyword">template</span>&lt;<span class="keyword">typename</span> T, <span class="keyword">typename</span> U&gt;
199<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 ) {
200<a name="l00232"></a>00232         <span class="keywordflow">return</span> a.get() == b.get();
201<a name="l00233"></a>00233 }
202<a name="l00234"></a>00234
203<a name="l00236"></a>00236 <span class="keyword">template</span>&lt;<span class="keyword">typename</span> T, <span class="keyword">typename</span> U&gt;
204<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 ) {
205<a name="l00238"></a>00238         <span class="keywordflow">return</span> a.get() != b.get();
206<a name="l00239"></a>00239 }
207<a name="l00240"></a>00240
208<a name="l00242"></a>00242 <span class="keyword">template</span>&lt;<span class="keyword">typename</span> T, <span class="keyword">typename</span> U&gt;
209<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 ) {
210<a name="l00244"></a>00244         <span class="keywordflow">return</span> a.get() &lt; b.get();
211<a name="l00245"></a>00245 }
212<a name="l00246"></a>00246
213<a name="l00254"></a>00254 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;
214<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;
215<a name="l00256"></a>00256 {
216<a name="l00257"></a>00257 <span class="keyword">public</span>:
[651]217<a name="l00263"></a><a class="code" href="classbdm_1_1object__ptr.html#9f1016ff2bbfa497d1cc0a4497c1fba4">00263</a>         <a class="code" href="classbdm_1_1object__ptr.html#9f1016ff2bbfa497d1cc0a4497c1fba4" 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() ) { }
[591]218<a name="l00264"></a>00264
[651]219<a name="l00270"></a><a class="code" href="classbdm_1_1object__ptr.html#dcb20017177c98274c16087b2c0067dc">00270</a>         <a class="code" href="classbdm_1_1object__ptr.html#dcb20017177c98274c16087b2c0067dc" 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">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 ) {
220<a name="l00271"></a>00271                 <a class="code" href="bdmerror_8h.html#89a0f906b242b79c5d3d342291b2cab4" 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">"object_ptr cannot be empty"</span> );
[591]221<a name="l00272"></a>00272         }
222<a name="l00273"></a>00273
[651]223<a name="l00278"></a><a class="code" href="classbdm_1_1object__ptr.html#a9eb00600d8640711eadeed98c7892e9">00278</a>         <a class="code" href="classbdm_1_1object__ptr.html#a9eb00600d8640711eadeed98c7892e9">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 ) {
224<a name="l00279"></a>00279                 <a class="code" href="bdmerror_8h.html#89a0f906b242b79c5d3d342291b2cab4" title="Throw std::runtime_exception if t is not true and NDEBUG is not defined.">bdm_assert_debug</a> ( p, <span class="stringliteral">"object_ptr cannot be empty"</span> );
[591]225<a name="l00280"></a>00280         }
226<a name="l00281"></a>00281
[651]227<a name="l00285"></a><a class="code" href="classbdm_1_1object__ptr.html#9c80da05b7b3dfc59333ca9bf6f62970">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#9c80da05b7b3dfc59333ca9bf6f62970" 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 ) {
228<a name="l00286"></a>00286                 <a class="code" href="classbdm_1_1object__ptr.html#9c80da05b7b3dfc59333ca9bf6f62970" title="Assignment operator.">shared_ptr&lt;T&gt;::operator= </a>( other );
[591]229<a name="l00287"></a>00287                 <span class="keywordflow">return</span> *<span class="keyword">this</span>;
230<a name="l00288"></a>00288         }
231<a name="l00289"></a>00289 };
232<a name="l00290"></a>00290
233<a name="l00291"></a>00291 <span class="preprocessor">#define SHAREDPTR(class_name) typedef bdm::object_ptr&lt; class_name &gt; class_name##_ptr</span>
234<a name="l00292"></a>00292 <span class="preprocessor"></span>
235<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>
236<a name="l00294"></a>00294 <span class="preprocessor"></span>
237<a name="l00295"></a>00295 }
238<a name="l00296"></a>00296
239<a name="l00297"></a>00297 <span class="preprocessor">#endif</span>
[472]240</pre></div></div>
[651]241<hr size="1"><address style="text-align: right;"><small>Generated on Wed Oct 7 17:34:43 2009 for mixpp by&nbsp;
[472]242<a href="http://www.doxygen.org/index.html">
[651]243<img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.9 </small></address>
[472]244</body>
245</html>
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