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  50 <div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">//</span></div><div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment">// Copyright 2005-2007 Adobe Systems Incorporated</span></div><div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment">//</span></div><div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment">// Distributed under the Boost Software License, Version 1.0</span></div><div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment">// See accompanying file LICENSE_1_0.txt or copy at</span></div><div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment">// http://www.boost.org/LICENSE_1_0.txt</span></div><div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment">//</span></div><div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="preprocessor">#ifndef BOOST_GIL_EXTENSION_DYNAMIC_IMAGE_DYNAMIC_AT_C_HPP</span></div><div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="preprocessor">#define BOOST_GIL_EXTENSION_DYNAMIC_IMAGE_DYNAMIC_AT_C_HPP</span></div><div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;</div><div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="preprocessor">#include &lt;boost/gil/detail/mp11.hpp&gt;</span></div><div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;</div><div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="preprocessor">#include &lt;boost/preprocessor/facilities/empty.hpp&gt;</span></div><div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="preprocessor">#include &lt;boost/preprocessor/repetition/repeat.hpp&gt;</span></div><div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;</div><div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="preprocessor">#include &lt;stdexcept&gt;</span></div><div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;</div><div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;<span class="keyword">namespace </span>boost { <span class="keyword">namespace </span>gil {</div><div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;</div><div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<span class="comment">// Constructs for static-to-dynamic integer convesion</span></div><div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;</div><div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="preprocessor">#define GIL_AT_C_VALUE(z, N, text) mp11::mp_at_c&lt;IntTypes, S+N&gt;::value,</span></div><div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<span class="preprocessor">#define GIL_DYNAMIC_AT_C_LIMIT 226 // size of the maximum vector to handle</span></div><div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;</div><div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;<span class="preprocessor">#define GIL_AT_C_LOOKUP(z, NUM, text)                                   \</span></div><div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;<span class="preprocessor">    template&lt;std::size_t S&gt;                                             \</span></div><div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;<span class="preprocessor">    struct at_c_fn&lt;S,NUM&gt; {                                             \</span></div><div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;<span class="preprocessor">    template &lt;typename IntTypes, typename ValueType&gt; inline           \</span></div><div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;<span class="preprocessor">        static ValueType apply(std::size_t index) {                    \</span></div><div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;<span class="preprocessor">            static ValueType table[] = {                               \</span></div><div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;<span class="preprocessor">                BOOST_PP_REPEAT(NUM, GIL_AT_C_VALUE, BOOST_PP_EMPTY)    \</span></div><div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;<span class="preprocessor">            };                                                          \</span></div><div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;<span class="preprocessor">            return table[index];                                        \</span></div><div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;<span class="preprocessor">        }                                                               \</span></div><div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;<span class="preprocessor">    };</span></div><div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;</div><div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;<span class="keyword">namespace </span>detail {</div><div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;    <span class="keyword">namespace </span><a class="code" href="group___color_base_model_homogeneous.html#gae2eaf5eecbad94d7dc6432b8f759fba0">at_c</a> {</div><div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;        <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;</div><div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;        BOOST_PP_REPEAT(GIL_DYNAMIC_AT_C_LIMIT, GIL_AT_C_LOOKUP, BOOST_PP_EMPTY)</div><div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;</div><div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;        <span class="keyword">template</span> &lt;std::<span class="keywordtype">size_t</span> QUOT&gt; <span class="keyword">struct </span>at_c_impl;</div><div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;</div><div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;        <span class="keyword">template</span> &lt;&gt;</div><div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;        <span class="keyword">struct </span>at_c_impl&lt;0&gt; {</div><div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;            <span class="keyword">template</span> &lt;<span class="keyword">typename</span> IntTypes, <span class="keyword">typename</span> ValueType&gt; <span class="keyword">inline</span></div><div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;            <span class="keyword">static</span> ValueType apply(std::size_t index) {</div><div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;                <span class="keywordflow">return</span> at_c_fn&lt;0, mp11::mp_size&lt;IntTypes&gt;::value&gt;::template apply&lt;IntTypes,ValueType&gt;(index);</div><div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;            }</div><div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;        };</div><div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;</div><div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;        <span class="keyword">template</span> &lt;&gt;</div><div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;        <span class="keyword">struct </span>at_c_impl&lt;1&gt; {</div><div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;            <span class="keyword">template</span> &lt;<span class="keyword">typename</span> IntTypes, <span class="keyword">typename</span> ValueType&gt; <span class="keyword">inline</span></div><div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;            <span class="keyword">static</span> ValueType apply(std::size_t index) {</div><div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;                <span class="keyword">const</span> std::size_t SIZE = mp11::mp_size&lt;IntTypes&gt;::value;</div><div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;                <span class="keyword">const</span> std::size_t REM = SIZE % GIL_DYNAMIC_AT_C_LIMIT;</div><div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;                <span class="keywordflow">switch</span> (index / GIL_DYNAMIC_AT_C_LIMIT) {</div><div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;                    <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);</div><div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;                    <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);</div><div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;                };</div><div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;                <span class="keywordflow">throw</span>;</div><div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;            }</div><div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;        };</div><div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;</div><div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;        <span class="keyword">template</span> &lt;&gt;</div><div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;        <span class="keyword">struct </span>at_c_impl&lt;2&gt; {</div><div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;            <span class="keyword">template</span> &lt;<span class="keyword">typename</span> IntTypes, <span class="keyword">typename</span> ValueType&gt; <span class="keyword">inline</span></div><div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;            <span class="keyword">static</span> ValueType apply(std::size_t index) {</div><div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;                <span class="keyword">const</span> std::size_t SIZE = mp11::mp_size&lt;IntTypes&gt;::value;</div><div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;                <span class="keyword">const</span> std::size_t REM = SIZE % GIL_DYNAMIC_AT_C_LIMIT;</div><div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;                <span class="keywordflow">switch</span> (index / GIL_DYNAMIC_AT_C_LIMIT) {</div><div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;                    <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);</div><div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;                    <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);</div><div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;                    <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);</div><div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;                };</div><div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;                <span class="keywordflow">throw</span>;</div><div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;            }</div><div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;        };</div><div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;</div><div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;        <span class="keyword">template</span> &lt;&gt;</div><div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;        <span class="keyword">struct </span>at_c_impl&lt;3&gt; {</div><div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;            <span class="keyword">template</span> &lt;<span class="keyword">typename</span> IntTypes, <span class="keyword">typename</span> ValueType&gt; <span class="keyword">inline</span></div><div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;            <span class="keyword">static</span> ValueType apply(std::size_t index) {</div><div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;                <span class="keyword">const</span> std::size_t SIZE = mp11::mp_size&lt;IntTypes&gt;::value;</div><div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;                <span class="keyword">const</span> std::size_t REM = SIZE % GIL_DYNAMIC_AT_C_LIMIT;</div><div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;                <span class="keywordflow">switch</span> (index / GIL_DYNAMIC_AT_C_LIMIT) {</div><div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;                    <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);</div><div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;                    <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);</div><div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;                    <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);</div><div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;                    <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);</div><div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;                };</div><div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;                <span class="keywordflow">throw</span>;</div><div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;            }</div><div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;        };</div><div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;    }</div><div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;}</div><div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;</div><div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;</div><div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> IntTypes, <span class="keyword">typename</span> ValueType&gt; <span class="keyword">inline</span></div><div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;ValueType <a class="code" href="group___color_base_model_homogeneous.html#gae2eaf5eecbad94d7dc6432b8f759fba0">at_c</a>(std::size_t index) {</div><div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;    <span class="keyword">const</span> std::size_t Size=mp11::mp_size&lt;IntTypes&gt;::value;</div><div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;    <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);</div><div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;}</div><div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;</div><div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;<span class="preprocessor">#undef GIL_AT_C_VALUE</span></div><div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;<span class="preprocessor">#undef GIL_DYNAMIC_AT_C_LIMIT</span></div><div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;<span class="preprocessor">#undef GIL_AT_C_LOOKUP</span></div><div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;</div><div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;}} <span class="comment">// namespace boost::gil</span></div><div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;</div><div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;<span class="preprocessor">#endif</span></div><div class="ttc" id="group___color_base_model_homogeneous_html_gae2eaf5eecbad94d7dc6432b8f759fba0"><div class="ttname"><a href="group___color_base_model_homogeneous.html#gae2eaf5eecbad94d7dc6432b8f759fba0">boost::gil::at_c</a></div><div class="ttdeci">auto at_c(detail::homogeneous_color_base&lt; E, L, N &gt; &amp;p) -&gt; typename std::add_lvalue_reference&lt; E &gt;::type</div><div class="ttdoc">Provides mutable access to the K-th element, in physical order.</div><div class="ttdef"><b>Definition:</b> color_base.hpp:597</div></div>
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