ceph/src/boost/libs/gil/doc/html/g_i_l_0643.html

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  41 <h1>variant.hpp</h1><a href="variant_8hpp.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
  42 <a name="l00002"></a>00002 <span class="comment">    Copyright 2005-2007 Adobe Systems Incorporated</span>
  43 <a name="l00003"></a>00003 <span class="comment">   </span>
  44 <a name="l00004"></a>00004 <span class="comment">    Use, modification and distribution are subject to the Boost Software License,</span>
  45 <a name="l00005"></a>00005 <span class="comment">    Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at</span>
  46 <a name="l00006"></a>00006 <span class="comment">    http://www.boost.org/LICENSE_1_0.txt).</span>
  47 <a name="l00007"></a>00007 <span class="comment"></span>
  48 <a name="l00008"></a>00008 <span class="comment">    See http://opensource.adobe.com/gil for most recent version including documentation.</span>
  49 <a name="l00009"></a>00009 <span class="comment">*/</span>
  50 <a name="l00010"></a>00010
  51 <a name="l00011"></a>00011 <span class="comment">/*************************************************************************************************/</span>
  52 <a name="l00012"></a>00012
  53 <a name="l00013"></a>00013 <span class="preprocessor">#ifndef GIL_DYNAMICIMAGE_VARIANT_HPP</span>
  54 <a name="l00014"></a>00014 <span class="preprocessor"></span><span class="preprocessor">#define GIL_DYNAMICIMAGE_VARIANT_HPP</span>
  55 <a name="l00015"></a>00015 <span class="preprocessor"></span>
  56 <a name="l00024"></a>00024
  57 <a name="l00025"></a>00025 <span class="preprocessor">#include "../../gil_config.hpp"</span>
  58 <a name="l00026"></a>00026 <span class="preprocessor">#include "../../utilities.hpp"</span>
  59 <a name="l00027"></a>00027 <span class="preprocessor">#include &lt;cstddef&gt;</span>
  60 <a name="l00028"></a>00028 <span class="preprocessor">#include &lt;cassert&gt;</span>
  61 <a name="l00029"></a>00029 <span class="preprocessor">#include &lt;algorithm&gt;</span>
  62 <a name="l00030"></a>00030 <span class="preprocessor">#include &lt;typeinfo&gt;</span>
  63 <a name="l00031"></a>00031 <span class="preprocessor">#include &lt;boost/bind.hpp&gt;</span>
  64 <a name="l00032"></a>00032
  65 <a name="l00033"></a>00033 <span class="preprocessor">#include &lt;boost/mpl/transform.hpp&gt;</span>
  66 <a name="l00034"></a>00034 <span class="preprocessor">#include &lt;boost/mpl/size.hpp&gt;</span>
  67 <a name="l00035"></a>00035 <span class="preprocessor">#include &lt;boost/mpl/sizeof.hpp&gt;</span>
  68 <a name="l00036"></a>00036 <span class="preprocessor">#include &lt;boost/mpl/max.hpp&gt;</span>
  69 <a name="l00037"></a>00037 <span class="preprocessor">#include &lt;boost/mpl/at.hpp&gt;</span>
  70 <a name="l00038"></a>00038 <span class="preprocessor">#include &lt;boost/mpl/fold.hpp&gt;</span>
  71 <a name="l00039"></a>00039
  72 <a name="l00040"></a>00040 <span class="keyword">namespace </span>boost { <span class="keyword">namespace </span>gil {
  73 <a name="l00041"></a>00041
  74 <a name="l00042"></a>00042 <span class="keyword">namespace </span>detail {
  75 <a name="l00043"></a>00043     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Types, <span class="keyword">typename</span> T&gt; <span class="keyword">struct </span>type_to_index;
  76 <a name="l00044"></a>00044     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Op, <span class="keyword">typename</span> T&gt; <span class="keyword">struct </span>reduce;
  77 <a name="l00045"></a>00045     <span class="keyword">struct </span>destructor_op {
  78 <a name="l00046"></a>00046         <span class="keyword">typedef</span> <span class="keywordtype">void</span> result_type;
  79 <a name="l00047"></a>00047         <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt; result_type operator()(<span class="keyword">const</span> T&amp; t)<span class="keyword"> const </span>{ t.~T(); }
  80 <a name="l00048"></a>00048     };
  81 <a name="l00049"></a>00049     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T, <span class="keyword">typename</span> Bits&gt; <span class="keywordtype">void</span> copy_construct_in_place(<span class="keyword">const</span> T&amp; t, Bits&amp; bits);
  82 <a name="l00050"></a>00050     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Bits&gt; <span class="keyword">struct </span>copy_construct_in_place_fn;
  83 <a name="l00051"></a>00051 }
  84 <a name="l00086"></a>00086 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Types&gt;    <span class="comment">// models MPL Random Access Container</span>
  85 <a name="l00087"></a><a class="code" href="g_i_l_0062.html">00087</a> <span class="keyword">class </span><a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant</a> {
  86 <a name="l00088"></a>00088     <span class="comment">// size in bytes of the largest type in Types</span>
  87 <a name="l00089"></a>00089     <span class="keyword">static</span> <span class="keyword">const</span> std::size_t MAX_SIZE  = mpl::fold&lt;Types, mpl::size_t&lt;0&gt;, mpl::max&lt;mpl::_1, mpl::sizeof_&lt;mpl::_2&gt; &gt; &gt;::type::value;
  88 <a name="l00090"></a>00090     <span class="keyword">static</span> <span class="keyword">const</span> std::size_t NUM_TYPES = mpl::size&lt;Types&gt;::value;
  89 <a name="l00091"></a>00091 <span class="keyword">public</span>:
  90 <a name="l00092"></a>00092     <span class="keyword">typedef</span> Types                            types_t;
  91 <a name="l00093"></a>00093
  92 <a name="l00094"></a>00094     <span class="keyword">typedef</span> <span class="keyword">struct </span>{ <span class="keywordtype">char</span> data[MAX_SIZE]; } base_t;    <span class="comment">// empty space equal to the size of the largest type in Types</span>
  93 <a name="l00095"></a>00095
  94 <a name="l00096"></a>00096     <span class="comment">// Default constructor - default construct the first type</span>
  95 <a name="l00097"></a>00097     <a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant</a>() : _index(0)    { <span class="keyword">new</span>(&amp;_bits) <span class="keyword">typename</span> mpl::at_c&lt;Types,0&gt;::type(); }
  96 <a name="l00098"></a>00098     <span class="keyword">virtual</span> ~<a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant</a>()        { apply_operation(*<span class="keyword">this</span>, detail::destructor_op()); }
  97 <a name="l00099"></a>00099
  98 <a name="l00100"></a>00100     <span class="comment">// Throws std::bad_cast if T is not in Types</span>
  99 <a name="l00101"></a>00101     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt; <span class="keyword">explicit</span> <a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant</a>(<span class="keyword">const</span> T&amp; obj){ _index=type_id&lt;T&gt;(); <span class="keywordflow">if</span> (_index==NUM_TYPES) <span class="keywordflow">throw</span> std::bad_cast(); detail::copy_construct_in_place(obj, _bits); }
 100 <a name="l00102"></a>00102
 101 <a name="l00103"></a>00103     <span class="comment">// When doSwap is true, swaps obj with the contents of the variant. obj will contain default-constructed instance after the call</span>
 102 <a name="l00104"></a>00104     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt; <span class="keyword">explicit</span> <a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant</a>(T&amp; obj, <span class="keywordtype">bool</span> do_swap);
 103 <a name="l00105"></a>00105
 104 <a name="l00106"></a>00106     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt; <a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant</a>&amp; operator=(<span class="keyword">const</span> T&amp; obj) { <a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant</a> tmp(obj); swap(*<span class="keyword">this</span>,tmp); <span class="keywordflow">return</span> *<span class="keyword">this</span>; }
 105 <a name="l00107"></a>00107     <a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant</a>&amp; operator=(<span class="keyword">const</span> <a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant</a>&amp; v)                   { <a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant</a> tmp(v  ); swap(*<span class="keyword">this</span>,tmp); <span class="keywordflow">return</span> *<span class="keyword">this</span>; }
 106 <a name="l00108"></a>00108
 107 <a name="l00109"></a>00109     <a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant</a>(<span class="keyword">const</span> <a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant</a>&amp; v) : _index(v.<a class="code" href="g_i_l_0062.html#ab24a1a4e3ad662acbc481b2ce8d8cb8">_index</a>)           { apply_operation(v, detail::copy_construct_in_place_fn&lt;base_t&gt;(_bits)); }
 108 <a name="l00110"></a>00110     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt; <span class="keywordtype">void</span> move_in(T&amp; obj)             { <a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant</a> tmp(obj, <span class="keyword">true</span>); swap(*<span class="keyword">this</span>,tmp); }
 109 <a name="l00111"></a>00111
 110 <a name="l00112"></a>00112     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> TS&gt; <span class="keyword">friend</span> <span class="keywordtype">bool</span> operator==(<span class="keyword">const</span> <a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant&lt;TS&gt;</a>&amp; x, <span class="keyword">const</span> <a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant&lt;TS&gt;</a>&amp; y);
 111 <a name="l00113"></a>00113     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> TS&gt; <span class="keyword">friend</span> <span class="keywordtype">bool</span> operator!=(<span class="keyword">const</span> <a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant&lt;TS&gt;</a>&amp; x, <span class="keyword">const</span> <a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant&lt;TS&gt;</a>&amp; y);
 112 <a name="l00114"></a>00114
 113 <a name="l00115"></a>00115     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt; <span class="keyword">static</span> <span class="keywordtype">bool</span> has_type()           { <span class="keywordflow">return</span> type_id&lt;T&gt;()!=NUM_TYPES; }
 114 <a name="l00116"></a>00116
 115 <a name="l00117"></a>00117     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt; <span class="keyword">const</span> T&amp; _dynamic_cast()<span class="keyword">   const </span>{ <span class="keywordflow">if</span> (!current_type_is&lt;T&gt;()) <span class="keywordflow">throw</span> std::bad_cast(); <span class="keywordflow">return</span> *gil_reinterpret_cast_c&lt;const T*&gt;(&amp;_bits); }
 116 <a name="l00118"></a>00118     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;       T&amp; _dynamic_cast()         { <span class="keywordflow">if</span> (!current_type_is&lt;T&gt;()) <span class="keywordflow">throw</span> std::bad_cast(); <span class="keywordflow">return</span> *gil_reinterpret_cast  &lt;      T*&gt;(&amp;_bits); }
 117 <a name="l00119"></a>00119
 118 <a name="l00120"></a>00120     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt; <span class="keywordtype">bool</span> current_type_is()<span class="keyword">     const </span>{ <span class="keywordflow">return</span> type_id&lt;T&gt;()==_index; }
 119 <a name="l00121"></a>00121
 120 <a name="l00122"></a>00122 <span class="keyword">private</span>:
 121 <a name="l00123"></a>00123     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt; <span class="keyword">static</span> std::size_t type_id()     { <span class="keywordflow">return</span> <a class="code" href="g_i_l_0522.html" title="Returns the index corresponding to the first occurrance of a given given type in...">detail::type_to_index&lt;Types,T&gt;::value</a>; }
 122 <a name="l00124"></a>00124
 123 <a name="l00125"></a>00125     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Cs&gt; <span class="keyword">friend</span> <span class="keywordtype">void</span> swap(<a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant&lt;Cs&gt;</a>&amp; x, <a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant&lt;Cs&gt;</a>&amp; y);
 124 <a name="l00126"></a>00126     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Types2, <span class="keyword">typename</span> UnaryOp&gt; <span class="keyword">friend</span> <span class="keyword">typename</span> UnaryOp::result_type apply_operation(<a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant&lt;Types2&gt;</a>&amp; var, UnaryOp op);
 125 <a name="l00127"></a>00127     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Types2, <span class="keyword">typename</span> UnaryOp&gt; <span class="keyword">friend</span> <span class="keyword">typename</span> UnaryOp::result_type apply_operation(<span class="keyword">const</span> <a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant&lt;Types2&gt;</a>&amp; var, UnaryOp op);
 126 <a name="l00128"></a>00128     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Types1, <span class="keyword">typename</span> Types2, <span class="keyword">typename</span> BinaryOp&gt; <span class="keyword">friend</span> <span class="keyword">typename</span> BinaryOp::result_type apply_operation(<span class="keyword">const</span> <a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant&lt;Types1&gt;</a>&amp; arg1, <span class="keyword">const</span> <a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant&lt;Types2&gt;</a>&amp; arg2, BinaryOp op);
 127 <a name="l00129"></a>00129
 128 <a name="l00130"></a>00130     base_t      _bits;
 129 <a name="l00131"></a>00131     std::size_t    _index;
 130 <a name="l00132"></a>00132 };
 131 <a name="l00133"></a>00133
 132 <a name="l00134"></a>00134 <span class="keyword">namespace </span>detail {
 133 <a name="l00135"></a>00135
 134 <a name="l00136"></a>00136     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T, <span class="keyword">typename</span> Bits&gt;
 135 <a name="l00137"></a>00137     <span class="keywordtype">void</span> copy_construct_in_place(<span class="keyword">const</span> T&amp; t, Bits&amp; bits) {
 136 <a name="l00138"></a>00138         T&amp; b=*gil_reinterpret_cast&lt;T*&gt;(&amp;bits);
 137 <a name="l00139"></a>00139         <span class="keyword">new</span>(&amp;b)T(t);     <span class="comment">// default-construct</span>
 138 <a name="l00140"></a>00140     }
 139 <a name="l00141"></a>00141
 140 <a name="l00142"></a>00142     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Bits&gt;
 141 <a name="l00143"></a>00143     <span class="keyword">struct </span>copy_construct_in_place_fn {
 142 <a name="l00144"></a>00144         <span class="keyword">typedef</span> <span class="keywordtype">void</span> result_type;
 143 <a name="l00145"></a>00145         Bits&amp; _dst;
 144 <a name="l00146"></a>00146         copy_construct_in_place_fn(Bits&amp; dst) : _dst(dst) {}
 145 <a name="l00147"></a>00147
 146 <a name="l00148"></a>00148         <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt; <span class="keywordtype">void</span> operator()(<span class="keyword">const</span> T&amp; src)<span class="keyword"> const </span>{ copy_construct_in_place(src,_dst); }
 147 <a name="l00149"></a>00149     };
 148 <a name="l00150"></a>00150
 149 <a name="l00151"></a>00151     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Bits&gt;
 150 <a name="l00152"></a>00152     <span class="keyword">struct </span>equal_to_fn {
 151 <a name="l00153"></a>00153         <span class="keyword">const</span> Bits&amp; _dst;
 152 <a name="l00154"></a>00154         equal_to_fn(<span class="keyword">const</span> Bits&amp; dst) : _dst(dst) {}
 153 <a name="l00155"></a>00155
 154 <a name="l00156"></a>00156         <span class="keyword">typedef</span> <span class="keywordtype">bool</span> result_type;
 155 <a name="l00157"></a>00157         <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt; result_type operator()(<span class="keyword">const</span> T&amp; x)<span class="keyword"> const </span>{
 156 <a name="l00158"></a>00158             <span class="keywordflow">return</span> x==*gil_reinterpret_cast_c&lt;const T*&gt;(&amp;_dst);
 157 <a name="l00159"></a>00159         }
 158 <a name="l00160"></a>00160     };
 159 <a name="l00161"></a>00161 }
 160 <a name="l00162"></a>00162
 161 <a name="l00163"></a>00163 <span class="comment">// When doSwap is true, swaps obj with the contents of the variant. obj will contain default-constructed instance after the call</span>
 162 <a name="l00164"></a>00164 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Types&gt;
 163 <a name="l00165"></a>00165 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt; variant&lt;Types&gt;::variant(T&amp; obj, <span class="keywordtype">bool</span> do_swap) {
 164 <a name="l00166"></a>00166     _index=type_id&lt;T&gt;();
 165 <a name="l00167"></a>00167     <span class="keywordflow">if</span> (_index==NUM_TYPES) <span class="keywordflow">throw</span> std::bad_cast();
 166 <a name="l00168"></a>00168
 167 <a name="l00169"></a>00169     <span class="keywordflow">if</span> (do_swap) {
 168 <a name="l00170"></a>00170         <span class="keyword">new</span>(&amp;_bits) T();    <span class="comment">// default construct</span>
 169 <a name="l00171"></a>00171         swap(obj, *gil_reinterpret_cast&lt;T*&gt;(&amp;_bits));
 170 <a name="l00172"></a>00172     } <span class="keywordflow">else</span>
 171 <a name="l00173"></a>00173         detail::copy_construct_in_place(const_cast&lt;const T&amp;&gt;(obj), _bits);
 172 <a name="l00174"></a>00174 }
 173 <a name="l00175"></a>00175
 174 <a name="l00176"></a>00176 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Types&gt;
 175 <a name="l00177"></a>00177 <span class="keywordtype">void</span> swap(variant&lt;Types&gt;&amp; x, variant&lt;Types&gt;&amp; y) {
 176 <a name="l00178"></a>00178     std::swap(x._bits,y._bits);
 177 <a name="l00179"></a>00179     std::swap(x._index, y._index);
 178 <a name="l00180"></a>00180 }
 179 <a name="l00181"></a>00181
 180 <a name="l00182"></a>00182 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Types&gt;
 181 <a name="l00183"></a>00183 <span class="keyword">inline</span> <span class="keywordtype">bool</span> operator==(<span class="keyword">const</span> variant&lt;Types&gt;&amp; x, <span class="keyword">const</span> variant&lt;Types&gt;&amp; y) {
 182 <a name="l00184"></a>00184     <span class="keywordflow">return</span> x._index==y._index &amp;&amp; <a class="code" href="group___variant.html#g3dc0a90911c08815be11e1e49ec06037" title="Invokes a generic constant operation (represented as a binary function object) on...">apply_operation</a>(x,detail::equal_to_fn&lt;<span class="keyword">typename</span> variant&lt;Types&gt;::base_t&gt;(y._bits));
 183 <a name="l00185"></a>00185 }
 184 <a name="l00186"></a>00186
 185 <a name="l00187"></a>00187 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> C&gt;
 186 <a name="l00188"></a>00188 <span class="keyword">inline</span> <span class="keywordtype">bool</span> operator!=(<span class="keyword">const</span> variant&lt;C&gt;&amp; x, <span class="keyword">const</span> variant&lt;C&gt;&amp; y) {
 187 <a name="l00189"></a>00189     <span class="keywordflow">return</span> !(x==y);
 188 <a name="l00190"></a>00190 }
 189 <a name="l00191"></a>00191
 190 <a name="l00192"></a>00192 } }  <span class="comment">// namespace boost::gil</span>
 191 <a name="l00193"></a>00193
 192 <a name="l00194"></a>00194 <span class="preprocessor">#endif</span>
 193 </pre></div></div>
 194 <hr size="1"><address style="text-align: right;"><small>Generated on Sat May 2 13:50:15 2009 for Generic Image Library by&nbsp;
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 196 <img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.6 </small></address>
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