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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>
72<a name="l00020"></a>00020 <span class="preprocessor">#include "itpp_ext.h"</span>
73<a name="l00021"></a>00021
74<a name="l00022"></a>00022 <span class="keyword">namespace </span>bdm {
75<a name="l00023"></a>00023
76<a name="l00025"></a>00025 <span class="comment">// The standard template would naturally be preferable, _if_ it was</span>
77<a name="l00026"></a>00026 <span class="comment">// included in the standard libraries of all supported compilers - but</span>
78<a name="l00027"></a>00027 <span class="comment">// that's exactly what remains to be seen...</span>
79<a name="l00028"></a>00028 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;
80<a name="l00029"></a><a class="code" href="classbdm_1_1shared__ptr.html">00029</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 (really...">shared_ptr</a> {
81<a name="l00030"></a>00030     <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 (really...">shared_ptr</a>;
82<a name="l00031"></a>00031
83<a name="l00032"></a>00032 <span class="keyword">private</span>:
84<a name="l00033"></a>00033     T *payload;
85<a name="l00034"></a>00034     <span class="keywordtype">unsigned</span> *refCnt;
86<a name="l00035"></a>00035
87<a name="l00036"></a>00036 <span class="keyword">public</span>:
88<a name="l00038"></a><a class="code" href="classbdm_1_1shared__ptr.html#66a4d41031e37618f1a9bb3c81814c11">00038</a>     <a class="code" href="classbdm_1_1shared__ptr.html#66a4d41031e37618f1a9bb3c81814c11" title="Creates an empty shared_ptr - one that doesn&amp;#39;t point anywhere.">shared_ptr</a>():
89<a name="l00039"></a>00039         payload(0),
90<a name="l00040"></a>00040         refCnt(0)
91<a name="l00041"></a>00041     {
92<a name="l00042"></a>00042     }
93<a name="l00043"></a>00043
94<a name="l00047"></a><a class="code" href="classbdm_1_1shared__ptr.html#c8b7f0a813173581530c80d7ac4fc7c2">00047</a>     <a class="code" href="classbdm_1_1shared__ptr.html#66a4d41031e37618f1a9bb3c81814c11" title="Creates an empty shared_ptr - one that doesn&amp;#39;t point anywhere.">shared_ptr</a>(T *p):
95<a name="l00048"></a>00048         payload(p),
96<a name="l00049"></a>00049         refCnt(p ? new unsigned(1) : 0)
97<a name="l00050"></a>00050     {
98<a name="l00051"></a>00051     }
99<a name="l00052"></a>00052
100<a name="l00055"></a><a class="code" href="classbdm_1_1shared__ptr.html#357702d12bfd608a08b46e4a194aa4b5">00055</a>     <a class="code" href="classbdm_1_1shared__ptr.html#66a4d41031e37618f1a9bb3c81814c11" title="Creates an empty shared_ptr - one that doesn&amp;#39;t point anywhere.">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 (really...">shared_ptr&lt;T&gt;</a> &amp;other):
101<a name="l00056"></a>00056         payload(other.payload),
102<a name="l00057"></a>00057         refCnt(other.refCnt)
103<a name="l00058"></a>00058     {
104<a name="l00059"></a>00059         add_ref();
105<a name="l00060"></a>00060     }
106<a name="l00061"></a>00061       
107<a name="l00064"></a>00064     <span class="keyword">template</span>&lt;<span class="keyword">typename</span> U&gt;
108<a name="l00065"></a><a class="code" href="classbdm_1_1shared__ptr.html#affa5b17385493f4102c52cf75d3b509">00065</a>     <a class="code" href="classbdm_1_1shared__ptr.html#66a4d41031e37618f1a9bb3c81814c11" title="Creates an empty shared_ptr - one that doesn&amp;#39;t point anywhere.">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 (really...">shared_ptr&lt;U&gt;</a> &amp;other):
109<a name="l00066"></a>00066         payload(other.payload),
110<a name="l00067"></a>00067         refCnt(other.refCnt)
111<a name="l00068"></a>00068     {
112<a name="l00069"></a>00069         add_ref();
113<a name="l00070"></a>00070     }
114<a name="l00071"></a>00071
115<a name="l00072"></a>00072     ~<a class="code" href="classbdm_1_1shared__ptr.html" title="A naive implementation of roughly a subset of the std::tr1:shared_ptr spec (really...">shared_ptr</a>()
116<a name="l00073"></a>00073     {
117<a name="l00074"></a>00074         del_ref();
118<a name="l00075"></a>00075     }
119<a name="l00076"></a>00076
120<a name="l00077"></a>00077     <a class="code" href="classbdm_1_1shared__ptr.html#66a4d41031e37618f1a9bb3c81814c11" title="Creates an empty shared_ptr - one that doesn&amp;#39;t point anywhere.">shared_ptr</a> &amp;operator=(<span class="keyword">const</span> <a class="code" href="classbdm_1_1shared__ptr.html#66a4d41031e37618f1a9bb3c81814c11" title="Creates an empty shared_ptr - one that doesn&amp;#39;t point anywhere.">shared_ptr</a> &amp;other)
121<a name="l00078"></a>00078     {
122<a name="l00079"></a>00079         other.add_ref();
123<a name="l00080"></a>00080         del_ref();
124<a name="l00081"></a>00081
125<a name="l00082"></a>00082         payload = other.payload;
126<a name="l00083"></a>00083         refCnt = other.refCnt;
127<a name="l00084"></a>00084
128<a name="l00085"></a>00085         <span class="keywordflow">return</span> *<span class="keyword">this</span>;
129<a name="l00086"></a>00086     }
130<a name="l00087"></a>00087
131<a name="l00090"></a><a class="code" href="classbdm_1_1shared__ptr.html#37ebcfb6750dd7b5630f1d2354c07a96">00090</a>     T *<span class="keyword">get</span>() { <span class="keywordflow">return</span> payload; }
132<a name="l00091"></a>00091
133<a name="l00095"></a><a class="code" href="classbdm_1_1shared__ptr.html#bcaae812868eacbad050beda465d2327">00095</a>     T *<a class="code" href="classbdm_1_1shared__ptr.html#bcaae812868eacbad050beda465d2327">operator-&gt;</a>()
134<a name="l00096"></a>00096     {
135<a name="l00097"></a>00097         it_assert_debug(payload, <span class="stringliteral">"dereferencing NULL"</span>);
136<a name="l00098"></a>00098         <span class="keywordflow">return</span> payload;
137<a name="l00099"></a>00099     }
138<a name="l00100"></a>00100
139<a name="l00104"></a><a class="code" href="classbdm_1_1shared__ptr.html#de38de837267becf5eed2839fea42c45">00104</a>     T &amp;<a class="code" href="classbdm_1_1shared__ptr.html#de38de837267becf5eed2839fea42c45">operator*</a>()
140<a name="l00105"></a>00105     {
141<a name="l00106"></a>00106         it_assert_debug(payload, <span class="stringliteral">"dereferencing NULL"</span>);
142<a name="l00107"></a>00107         <span class="keywordflow">return</span> *payload;
143<a name="l00108"></a>00108     }
144<a name="l00109"></a>00109
145<a name="l00112"></a><a class="code" href="classbdm_1_1shared__ptr.html#fff45e4841b2921cd42ce0691f8c1196">00112</a>     <span class="keyword">const</span> T* <span class="keyword">get</span>() <span class="keyword">const</span> { <span class="keywordflow">return</span> payload; }
146<a name="l00113"></a>00113
147<a name="l00117"></a><a class="code" href="classbdm_1_1shared__ptr.html#d89ec7ceb318241d833c7d278444396d">00117</a>     <span class="keyword">const</span> T *<a class="code" href="classbdm_1_1shared__ptr.html#bcaae812868eacbad050beda465d2327">operator-&gt;</a>()<span class="keyword"> const</span>
148<a name="l00118"></a>00118 <span class="keyword">    </span>{
149<a name="l00119"></a>00119         it_assert_debug(payload, <span class="stringliteral">"dereferencing NULL"</span>);
150<a name="l00120"></a>00120         <span class="keywordflow">return</span> payload;
151<a name="l00121"></a>00121     }
152<a name="l00122"></a>00122
153<a name="l00126"></a><a class="code" href="classbdm_1_1shared__ptr.html#de000a72fe73804aa26962432f264800">00126</a>     <span class="keyword">const</span> T &amp;<a class="code" href="classbdm_1_1shared__ptr.html#de38de837267becf5eed2839fea42c45">operator*</a>()<span class="keyword"> const</span>
154<a name="l00127"></a>00127 <span class="keyword">    </span>{
155<a name="l00128"></a>00128         it_assert_debug(payload, <span class="stringliteral">"dereferencing NULL"</span>);
156<a name="l00129"></a>00129         <span class="keywordflow">return</span> *payload;
157<a name="l00130"></a>00130     }
158<a name="l00131"></a>00131
159<a name="l00132"></a>00132     <span class="keywordtype">bool</span> unique()<span class="keyword"> const</span>
160<a name="l00133"></a>00133 <span class="keyword">    </span>{
161<a name="l00134"></a>00134         <span class="keywordflow">return</span> refCnt &amp;&amp; (*refCnt == 1);
162<a name="l00135"></a>00135     }
163<a name="l00136"></a>00136
164<a name="l00137"></a>00137     <span class="keywordtype">long</span> use_count()<span class="keyword"> const</span>
165<a name="l00138"></a>00138 <span class="keyword">    </span>{
166<a name="l00139"></a>00139         <span class="keywordflow">return</span> refCnt ? *refCnt : 0;
167<a name="l00140"></a>00140     }
168<a name="l00141"></a>00141
169<a name="l00142"></a>00142     operator bool()<span class="keyword"> const</span>
170<a name="l00143"></a>00143 <span class="keyword">    </span>{
171<a name="l00144"></a>00144       <span class="keywordflow">return</span> payload;
172<a name="l00145"></a>00145     }
173<a name="l00146"></a>00146
174<a name="l00147"></a>00147     <span class="keywordtype">void</span> swap(<a class="code" href="classbdm_1_1shared__ptr.html#66a4d41031e37618f1a9bb3c81814c11" title="Creates an empty shared_ptr - one that doesn&amp;#39;t point anywhere.">shared_ptr</a> &amp;other)
175<a name="l00148"></a>00148     {
176<a name="l00149"></a>00149         std::swap(payload, other.payload);
177<a name="l00150"></a>00150         std::swap(refCnt, other.refCnt);
178<a name="l00151"></a>00151     }
179<a name="l00152"></a>00152
180<a name="l00153"></a>00153 <span class="keyword">private</span>:
181<a name="l00154"></a>00154     <span class="keywordtype">void</span> add_ref()<span class="keyword"> const</span>
182<a name="l00155"></a>00155 <span class="keyword">    </span>{
183<a name="l00156"></a>00156         <span class="keywordflow">if</span> (refCnt) {
184<a name="l00157"></a>00157             <span class="keywordflow">if</span> (*refCnt == UINT_MAX) {
185<a name="l00158"></a>00158                 <span class="keywordflow">throw</span> std::overflow_error(
186<a name="l00159"></a>00159                     std::string(<span class="stringliteral">"Shared pointer has too many references."</span>));
187<a name="l00160"></a>00160             }
188<a name="l00161"></a>00161
189<a name="l00162"></a>00162             ++*refCnt;
190<a name="l00163"></a>00163         }
191<a name="l00164"></a>00164     }
192<a name="l00165"></a>00165
193<a name="l00166"></a>00166     <span class="keywordtype">void</span> del_ref()
194<a name="l00167"></a>00167     {
195<a name="l00168"></a>00168         <span class="keywordflow">if</span> (refCnt) {
196<a name="l00169"></a>00169             <span class="keywordflow">if</span> (!(--*refCnt)) {
197<a name="l00170"></a>00170                 <span class="keyword">delete</span> payload;
198<a name="l00171"></a>00171                 <span class="keyword">delete</span> refCnt;
199<a name="l00172"></a>00172             }
200<a name="l00173"></a>00173         }
201<a name="l00174"></a>00174     }
202<a name="l00175"></a>00175 };
203<a name="l00176"></a>00176
204<a name="l00177"></a>00177 <span class="keyword">template</span>&lt;<span class="keyword">typename</span> T, <span class="keyword">typename</span> U&gt;
205<a name="l00178"></a>00178 <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)
206<a name="l00179"></a>00179 {
207<a name="l00180"></a>00180     <span class="keywordflow">return</span> a.get() == b.get();
208<a name="l00181"></a>00181 }
209<a name="l00182"></a>00182
210<a name="l00183"></a>00183 <span class="keyword">template</span>&lt;<span class="keyword">typename</span> T, <span class="keyword">typename</span> U&gt;
211<a name="l00184"></a>00184 <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)
212<a name="l00185"></a>00185 {
213<a name="l00186"></a>00186     <span class="keywordflow">return</span> a.get() != b.get();
214<a name="l00187"></a>00187 }
215<a name="l00188"></a>00188
216<a name="l00189"></a>00189 <span class="keyword">template</span>&lt;<span class="keyword">typename</span> T, <span class="keyword">typename</span> U&gt;
217<a name="l00190"></a>00190 <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)
218<a name="l00191"></a>00191 {
219<a name="l00192"></a>00192     <span class="keywordflow">return</span> a.get() &lt; b.get();
220<a name="l00193"></a>00193 }
221<a name="l00194"></a>00194
222<a name="l00195"></a>00195 }
223<a name="l00196"></a>00196
224<a name="l00197"></a>00197 <span class="preprocessor">#endif</span>
225</pre></div></div>
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