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<h1>dynamic_at_c.hpp</h1><a href="g_i_l_0081.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> Copyright 2005-2007 Adobe Systems Incorporated</span>
<a name="l00003"></a>00003 <span class="comment"> </span>
<a name="l00004"></a>00004 <span class="comment"> Use, modification and distribution are subject to the Boost Software License,</span>
<a name="l00005"></a>00005 <span class="comment"> Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at</span>
<a name="l00006"></a>00006 <span class="comment"> http://www.boost.org/LICENSE_1_0.txt).</span>
<a name="l00007"></a>00007 <span class="comment"></span>
<a name="l00008"></a>00008 <span class="comment"> See http://opensource.adobe.com/gil for most recent version including documentation.</span>
<a name="l00009"></a>00009 <span class="comment">*/</span>
<a name="l00010"></a>00010
<a name="l00011"></a>00011 <span class="comment">/*************************************************************************************************/</span>
<a name="l00012"></a>00012
<a name="l00013"></a>00013 <span class="preprocessor">#ifndef GIL_DYNAMIC_AT_C_HPP</span>
<a name="l00014"></a>00014 <span class="preprocessor"></span><span class="preprocessor">#define GIL_DYNAMIC_AT_C_HPP</span>
<a name="l00015"></a>00015 <span class="preprocessor"></span>
<a name="l00016"></a>00016 <span class="preprocessor">#include "../../gil_config.hpp"</span>
<a name="l00017"></a>00017 <span class="preprocessor">#include &lt;cassert&gt;</span>
<a name="l00018"></a>00018 <span class="preprocessor">#include &lt;stdexcept&gt;</span>
<a name="l00019"></a>00019 <span class="preprocessor">#include &lt;boost/mpl/at.hpp&gt;</span>
<a name="l00020"></a>00020 <span class="preprocessor">#include &lt;boost/mpl/size.hpp&gt;</span>
<a name="l00021"></a>00021
<a name="l00022"></a>00022
<a name="l00031"></a>00031
<a name="l00032"></a>00032 <span class="keyword">namespace </span>boost { <span class="keyword">namespace </span>gil {
<a name="l00033"></a>00033
<a name="l00034"></a>00034 <span class="preprocessor">#define GIL_AT_C_VALUE(z, N, text) mpl::at_c&lt;IntTypes,S+N&gt;::type::value,</span>
<a name="l00035"></a>00035 <span class="preprocessor"></span><span class="preprocessor">#define GIL_DYNAMIC_AT_C_LIMIT 226 // size of the maximum vector to handle</span>
<a name="l00036"></a>00036 <span class="preprocessor"></span>
<a name="l00037"></a>00037 <span class="preprocessor">#define GIL_AT_C_LOOKUP(z, NUM, text) \</span>
<a name="l00038"></a>00038 <span class="preprocessor"> template&lt;std::size_t S&gt; \</span>
<a name="l00039"></a>00039 <span class="preprocessor"> struct at_c_fn&lt;S,NUM&gt; { \</span>
<a name="l00040"></a>00040 <span class="preprocessor"> template &lt;typename IntTypes, typename ValueType&gt; inline \</span>
<a name="l00041"></a>00041 <span class="preprocessor"> static ValueType apply(std::size_t index) { \</span>
<a name="l00042"></a>00042 <span class="preprocessor"> static ValueType table[] = { \</span>
<a name="l00043"></a>00043 <span class="preprocessor"> BOOST_PP_REPEAT(NUM, GIL_AT_C_VALUE, BOOST_PP_EMPTY) \</span>
<a name="l00044"></a>00044 <span class="preprocessor"> }; \</span>
<a name="l00045"></a>00045 <span class="preprocessor"> return table[index]; \</span>
<a name="l00046"></a>00046 <span class="preprocessor"> } \</span>
<a name="l00047"></a>00047 <span class="preprocessor"> };</span>
<a name="l00048"></a>00048 <span class="preprocessor"></span>
<a name="l00049"></a>00049 <span class="keyword">namespace </span>detail {
<a name="l00050"></a>00050 <span class="keyword">namespace </span>at_c {
<a name="l00051"></a>00051 <span class="keyword">template</span> &lt;std::<span class="keywordtype">size_t</span> START, std::<span class="keywordtype">size_t</span> NUM&gt; <span class="keyword">struct </span>at_c_fn;
<a name="l00052"></a>00052 BOOST_PP_REPEAT(GIL_DYNAMIC_AT_C_LIMIT, GIL_AT_C_LOOKUP, BOOST_PP_EMPTY)
<a name="l00053"></a>00053
<a name="l00054"></a>00054 template &lt;std::<span class="keywordtype">size_t</span> QUOT&gt; struct at_c_impl;
<a name="l00055"></a>00055
<a name="l00056"></a>00056 template &lt;&gt;
<a name="l00057"></a>00057 struct at_c_impl&lt;0&gt; {
<a name="l00058"></a>00058 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> IntTypes, <span class="keyword">typename</span> ValueType&gt; <span class="keyword">inline</span>
<a name="l00059"></a>00059 <span class="keyword">static</span> ValueType apply(std::size_t index) {
<a name="l00060"></a>00060 <span class="keywordflow">return</span> at_c_fn&lt;0,mpl::size&lt;IntTypes&gt;::value&gt;::template apply&lt;IntTypes,ValueType&gt;(index);
<a name="l00061"></a>00061 }
<a name="l00062"></a>00062 };
<a name="l00063"></a>00063
<a name="l00064"></a>00064 <span class="keyword">template</span> &lt;&gt;
<a name="l00065"></a>00065 <span class="keyword">struct </span>at_c_impl&lt;1&gt; {
<a name="l00066"></a>00066 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> IntTypes, <span class="keyword">typename</span> ValueType&gt; <span class="keyword">inline</span>
<a name="l00067"></a>00067 <span class="keyword">static</span> ValueType apply(std::size_t index) {
<a name="l00068"></a>00068 <span class="keyword">const</span> std::size_t SIZE=mpl::size&lt;IntTypes&gt;::value;
<a name="l00069"></a>00069 <span class="keyword">const</span> std::size_t REM = SIZE % GIL_DYNAMIC_AT_C_LIMIT;
<a name="l00070"></a>00070 <span class="keywordflow">switch</span> (index / GIL_DYNAMIC_AT_C_LIMIT) {
<a name="l00071"></a>00071 <span class="keywordflow">case</span> 0: <span class="keywordflow">return</span> at_c_fn&lt;0 ,GIL_DYNAMIC_AT_C_LIMIT-1&gt;::template apply&lt;IntTypes,ValueType&gt;(index);
<a name="l00072"></a>00072 <span class="keywordflow">case</span> 1: <span class="keywordflow">return</span> at_c_fn&lt;GIL_DYNAMIC_AT_C_LIMIT ,REM &gt;::template apply&lt;IntTypes,ValueType&gt;(index - GIL_DYNAMIC_AT_C_LIMIT);
<a name="l00073"></a>00073 };
<a name="l00074"></a>00074 <span class="keywordflow">throw</span>;
<a name="l00075"></a>00075 }
<a name="l00076"></a>00076 };
<a name="l00077"></a>00077
<a name="l00078"></a>00078 <span class="keyword">template</span> &lt;&gt;
<a name="l00079"></a>00079 <span class="keyword">struct </span>at_c_impl&lt;2&gt; {
<a name="l00080"></a>00080 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> IntTypes, <span class="keyword">typename</span> ValueType&gt; <span class="keyword">inline</span>
<a name="l00081"></a>00081 <span class="keyword">static</span> ValueType apply(std::size_t index) {
<a name="l00082"></a>00082 <span class="keyword">const</span> std::size_t SIZE=mpl::size&lt;IntTypes&gt;::value;
<a name="l00083"></a>00083 <span class="keyword">const</span> std::size_t REM = SIZE % GIL_DYNAMIC_AT_C_LIMIT;
<a name="l00084"></a>00084 <span class="keywordflow">switch</span> (index / GIL_DYNAMIC_AT_C_LIMIT) {
<a name="l00085"></a>00085 <span class="keywordflow">case</span> 0: <span class="keywordflow">return</span> at_c_fn&lt;0 ,GIL_DYNAMIC_AT_C_LIMIT-1&gt;::template apply&lt;IntTypes,ValueType&gt;(index);
<a name="l00086"></a>00086 <span class="keywordflow">case</span> 1: <span class="keywordflow">return</span> at_c_fn&lt;GIL_DYNAMIC_AT_C_LIMIT ,GIL_DYNAMIC_AT_C_LIMIT-1&gt;::template apply&lt;IntTypes,ValueType&gt;(index - GIL_DYNAMIC_AT_C_LIMIT);
<a name="l00087"></a>00087 <span class="keywordflow">case</span> 2: <span class="keywordflow">return</span> at_c_fn&lt;GIL_DYNAMIC_AT_C_LIMIT*2,REM &gt;::template apply&lt;IntTypes,ValueType&gt;(index - GIL_DYNAMIC_AT_C_LIMIT*2);
<a name="l00088"></a>00088 };
<a name="l00089"></a>00089 <span class="keywordflow">throw</span>;
<a name="l00090"></a>00090 }
<a name="l00091"></a>00091 };
<a name="l00092"></a>00092
<a name="l00093"></a>00093 <span class="keyword">template</span> &lt;&gt;
<a name="l00094"></a>00094 <span class="keyword">struct </span>at_c_impl&lt;3&gt; {
<a name="l00095"></a>00095 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> IntTypes, <span class="keyword">typename</span> ValueType&gt; <span class="keyword">inline</span>
<a name="l00096"></a>00096 <span class="keyword">static</span> ValueType apply(std::size_t index) {
<a name="l00097"></a>00097 <span class="keyword">const</span> std::size_t SIZE=mpl::size&lt;IntTypes&gt;::value;
<a name="l00098"></a>00098 <span class="keyword">const</span> std::size_t REM = SIZE % GIL_DYNAMIC_AT_C_LIMIT;
<a name="l00099"></a>00099 <span class="keywordflow">switch</span> (index / GIL_DYNAMIC_AT_C_LIMIT) {
<a name="l00100"></a>00100 <span class="keywordflow">case</span> 0: <span class="keywordflow">return</span> at_c_fn&lt;0 ,GIL_DYNAMIC_AT_C_LIMIT-1&gt;::template apply&lt;IntTypes,ValueType&gt;(index);
<a name="l00101"></a>00101 <span class="keywordflow">case</span> 1: <span class="keywordflow">return</span> at_c_fn&lt;GIL_DYNAMIC_AT_C_LIMIT ,GIL_DYNAMIC_AT_C_LIMIT-1&gt;::template apply&lt;IntTypes,ValueType&gt;(index - GIL_DYNAMIC_AT_C_LIMIT);
<a name="l00102"></a>00102 <span class="keywordflow">case</span> 2: <span class="keywordflow">return</span> at_c_fn&lt;GIL_DYNAMIC_AT_C_LIMIT*2,GIL_DYNAMIC_AT_C_LIMIT-1&gt;::template apply&lt;IntTypes,ValueType&gt;(index - GIL_DYNAMIC_AT_C_LIMIT*2);
<a name="l00103"></a>00103 <span class="keywordflow">case</span> 3: <span class="keywordflow">return</span> at_c_fn&lt;GIL_DYNAMIC_AT_C_LIMIT*3,REM &gt;::template apply&lt;IntTypes,ValueType&gt;(index - GIL_DYNAMIC_AT_C_LIMIT*3);
<a name="l00104"></a>00104 };
<a name="l00105"></a>00105 <span class="keywordflow">throw</span>;
<a name="l00106"></a>00106 }
<a name="l00107"></a>00107 };
<a name="l00108"></a>00108 }
<a name="l00109"></a>00109 }
<a name="l00110"></a>00110
<a name="l00117"></a>00117
<a name="l00118"></a>00118 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> IntTypes, <span class="keyword">typename</span> ValueType&gt; <span class="keyword">inline</span>
<a name="l00119"></a>00119 ValueType at_c(std::size_t index) {
<a name="l00120"></a>00120 <span class="keyword">const</span> std::size_t Size=mpl::size&lt;IntTypes&gt;::value;
<a name="l00121"></a>00121 <span class="keywordflow">return</span> detail::at_c::at_c_impl&lt;Size/GIL_DYNAMIC_AT_C_LIMIT&gt;::template apply&lt;IntTypes,ValueType&gt;(index);
<a name="l00122"></a>00122 }
<a name="l00123"></a>00123
<a name="l00124"></a>00124 <span class="preprocessor">#undef GIL_AT_C_VALUE</span>
<a name="l00125"></a>00125 <span class="preprocessor"></span><span class="preprocessor">#undef GIL_DYNAMIC_AT_C_LIMIT</span>
<a name="l00126"></a>00126 <span class="preprocessor"></span><span class="preprocessor">#undef GIL_AT_C_LOOKUP</span>
<a name="l00127"></a>00127 <span class="preprocessor"></span>
<a name="l00128"></a>00128 } } <span class="comment">// namespace boost::gil</span>
<a name="l00129"></a>00129
<a name="l00130"></a>00130 <span class="preprocessor">#endif</span>
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