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  • library/doc/html/shared__ptr_8h_source.html

    r472 r591  
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    35<title>mixpp: shared_ptr.h Source File</title> 
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    912<!-- 
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    7073<a name="l00018"></a>00018 <span class="preprocessor">#include &lt;stdexcept&gt;</span> 
    7174<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> 
     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> 
    7376<a name="l00021"></a>00021  
    7477<a name="l00022"></a>00022 <span class="keyword">namespace </span>bdm { 
    7578<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     } 
     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                 <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> ); 
     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         } 
    163138<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     } 
     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         } 
    179147<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     } 
     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         } 
    192156<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             } 
     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; 
    200159<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> 
     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> 
    225243</pre></div></div> 
    226 <hr size="1"><address style="text-align: right;"><small>Generated on Wed Aug 5 00:06:48 2009 for mixpp by&nbsp; 
     244<hr size="1"/><address style="text-align: right;"><small>Generated on Sun Aug 30 22:10:49 2009 for mixpp by&nbsp; 
    227245<a href="http://www.doxygen.org/index.html"> 
    228 <img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.9 </small></address> 
     246<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.6.1 </small></address> 
    229247</body> 
    230248</html>