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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_CONCEPTS_CHANNEL_HPP</span></div><div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="preprocessor">#define BOOST_GIL_CONCEPTS_CHANNEL_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/concepts/basic.hpp&gt;</span></div><div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="preprocessor">#include &lt;boost/gil/concepts/concept_check.hpp&gt;</span></div><div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="preprocessor">#include &lt;boost/gil/concepts/fwd.hpp&gt;</span></div><div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;</div><div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="preprocessor">#include &lt;boost/concept_check.hpp&gt;</span></div><div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;</div><div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="preprocessor">#include &lt;utility&gt;</span> <span class="comment">// std::swap</span></div><div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;<span class="preprocessor">#include &lt;type_traits&gt;</span></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="preprocessor">#if defined(BOOST_CLANG)</span></div><div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;<span class="preprocessor">#pragma clang diagnostic push</span></div><div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="preprocessor">#pragma clang diagnostic ignored &quot;-Wunused-local-typedefs&quot;</span></div><div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<span class="preprocessor">#endif</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">#if defined(BOOST_GCC) &amp;&amp; (BOOST_GCC &gt;= 40900)</span></div><div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;<span class="preprocessor">#pragma GCC diagnostic push</span></div><div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;<span class="preprocessor">#pragma GCC diagnostic ignored &quot;-Wunused-local-typedefs&quot;</span></div><div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;<span class="preprocessor">#endif</span></div><div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;</div><div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;<span class="keyword">namespace </span>boost { <span class="keyword">namespace </span>gil {</div><div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;</div><div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;<span class="comment">// Forward declarations</span></div><div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div><div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;<span class="keyword">struct </span>channel_traits;</div><div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;</div><div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> DstT, <span class="keyword">typename</span> SrcT&gt;</div><div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;<span class="keyword">auto</span> <a class="code" href="group___channel_convert_algorithm.html#ga1ca10b1d27bc2f2ce4906b8890e613a5">channel_convert</a>(SrcT <span class="keyword">const</span>&amp; val)</div><div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;    -&gt; <span class="keyword">typename</span> channel_traits&lt;DstT&gt;::value_type;</div><div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;</div><div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div><div class="line"><a name="l00073"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1_channel_concept.html">   73</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1_channel_concept.html">ChannelConcept</a></div><div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;{</div><div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;    <span class="keywordtype">void</span> constraints()</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;        gil_function_requires&lt;boost::EqualityComparableConcept&lt;T&gt;&gt;();</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;        <span class="keyword">using</span> v = <span class="keyword">typename</span> channel_traits&lt;T&gt;::value_type;</div><div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;        <span class="keyword">using</span> r = <span class="keyword">typename</span> channel_traits&lt;T&gt;::reference;</div><div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;        <span class="keyword">using</span> p = <span class="keyword">typename</span> channel_traits&lt;T&gt;::pointer;</div><div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;        <span class="keyword">using</span> cr = <span class="keyword">typename</span> channel_traits&lt;T&gt;::const_reference;</div><div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;        <span class="keyword">using</span> cp = <span class="keyword">typename</span> channel_traits&lt;T&gt;::const_pointer;</div><div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;</div><div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;        channel_traits&lt;T&gt;::min_value();</div><div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;        channel_traits&lt;T&gt;::max_value();</div><div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;    }</div><div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;</div><div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;     T c;</div><div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;};</div><div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;</div><div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;<span class="keyword">namespace </span>detail</div><div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;{</div><div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;</div><div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div><div class="line"><a name="l00097"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1detail_1_1_channel_is_mutable_concept.html">   97</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1detail_1_1_channel_is_mutable_concept.html">ChannelIsMutableConcept</a></div><div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;{</div><div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;    <span class="keywordtype">void</span> constraints()</div><div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;    {</div><div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;        c1 = c2;</div><div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;        <span class="keyword">using</span> <a class="code" href="group___packed_channel_reference_model.html#ga70de3c85964650c16afcc42c02bd5df9">std::swap</a>;</div><div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;        <a class="code" href="group___packed_channel_reference_model.html#ga70de3c85964650c16afcc42c02bd5df9">swap</a>(c1, c2);</div><div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;    }</div><div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;    T c1;</div><div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;    T c2;</div><div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;};</div><div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;</div><div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;} <span class="comment">// namespace detail</span></div><div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;</div><div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div><div class="line"><a name="l00117"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1_mutable_channel_concept.html">  117</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1_mutable_channel_concept.html">MutableChannelConcept</a></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="keywordtype">void</span> constraints()</div><div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;    {</div><div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;        gil_function_requires&lt;ChannelConcept&lt;T&gt;&gt;();</div><div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;        gil_function_requires&lt;detail::ChannelIsMutableConcept&lt;T&gt;&gt;();</div><div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;    }</div><div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;};</div><div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;</div><div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div><div class="line"><a name="l00132"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1_channel_value_concept.html">  132</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1_channel_value_concept.html">ChannelValueConcept</a></div><div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;{</div><div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;    <span class="keywordtype">void</span> constraints()</div><div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;    {</div><div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;        gil_function_requires&lt;ChannelConcept&lt;T&gt;&gt;();</div><div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;        gil_function_requires&lt;Regular&lt;T&gt;&gt;();</div><div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;    }</div><div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;};</div><div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;</div><div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T1, <span class="keyword">typename</span> T2&gt;  <span class="comment">// Models GIL Pixel</span></div><div class="line"><a name="l00153"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channels__are__compatible.html">  153</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1channels__are__compatible.html">channels_are_compatible</a></div><div class="line"><a name="l00154"></a><span class="lineno">  154</span>&#160;    : std::is_same</div><div class="line"><a name="l00155"></a><span class="lineno">  155</span>&#160;        &lt;</div><div class="line"><a name="l00156"></a><span class="lineno">  156</span>&#160;            typename channel_traits&lt;T1&gt;::value_type,</div><div class="line"><a name="l00157"></a><span class="lineno">  157</span>&#160;            typename channel_traits&lt;T2&gt;::value_type</div><div class="line"><a name="l00158"></a><span class="lineno">  158</span>&#160;        &gt;</div><div class="line"><a name="l00159"></a><span class="lineno">  159</span>&#160;{</div><div class="line"><a name="l00160"></a><span class="lineno">  160</span>&#160;};</div><div class="line"><a name="l00161"></a><span class="lineno">  161</span>&#160;</div><div class="line"><a name="l00171"></a><span class="lineno">  171</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Channel1, <span class="keyword">typename</span> Channel2&gt;</div><div class="line"><a name="l00172"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1_channels_compatible_concept.html">  172</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1_channels_compatible_concept.html">ChannelsCompatibleConcept</a></div><div class="line"><a name="l00173"></a><span class="lineno">  173</span>&#160;{</div><div class="line"><a name="l00174"></a><span class="lineno">  174</span>&#160;    <span class="keywordtype">void</span> constraints()</div><div class="line"><a name="l00175"></a><span class="lineno">  175</span>&#160;    {</div><div class="line"><a name="l00176"></a><span class="lineno">  176</span>&#160;        static_assert(<a class="code" href="structboost_1_1gil_1_1channels__are__compatible.html">channels_are_compatible&lt;Channel1, Channel2&gt;::value</a>, <span class="stringliteral">&quot;&quot;</span>);</div><div class="line"><a name="l00177"></a><span class="lineno">  177</span>&#160;    }</div><div class="line"><a name="l00178"></a><span class="lineno">  178</span>&#160;};</div><div class="line"><a name="l00179"></a><span class="lineno">  179</span>&#160;</div><div class="line"><a name="l00191"></a><span class="lineno">  191</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> SrcChannel, <span class="keyword">typename</span> DstChannel&gt;</div><div class="line"><a name="l00192"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1_channel_convertible_concept.html">  192</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1_channel_convertible_concept.html">ChannelConvertibleConcept</a></div><div class="line"><a name="l00193"></a><span class="lineno">  193</span>&#160;{</div><div class="line"><a name="l00194"></a><span class="lineno">  194</span>&#160;    <span class="keywordtype">void</span> constraints()</div><div class="line"><a name="l00195"></a><span class="lineno">  195</span>&#160;    {</div><div class="line"><a name="l00196"></a><span class="lineno">  196</span>&#160;        gil_function_requires&lt;ChannelConcept&lt;SrcChannel&gt;&gt;();</div><div class="line"><a name="l00197"></a><span class="lineno">  197</span>&#160;        gil_function_requires&lt;MutableChannelConcept&lt;DstChannel&gt;&gt;();</div><div class="line"><a name="l00198"></a><span class="lineno">  198</span>&#160;        dst = channel_convert&lt;DstChannel, SrcChannel&gt;(src);</div><div class="line"><a name="l00199"></a><span class="lineno">  199</span>&#160;        ignore_unused_variable_warning(dst);</div><div class="line"><a name="l00200"></a><span class="lineno">  200</span>&#160;    }</div><div class="line"><a name="l00201"></a><span class="lineno">  201</span>&#160;    SrcChannel src;</div><div class="line"><a name="l00202"></a><span class="lineno">  202</span>&#160;    DstChannel dst;</div><div class="line"><a name="l00203"></a><span class="lineno">  203</span>&#160;};</div><div class="line"><a name="l00204"></a><span class="lineno">  204</span>&#160;</div><div class="line"><a name="l00205"></a><span class="lineno">  205</span>&#160;}} <span class="comment">// namespace boost::gil</span></div><div class="line"><a name="l00206"></a><span class="lineno">  206</span>&#160;</div><div class="line"><a name="l00207"></a><span class="lineno">  207</span>&#160;<span class="preprocessor">#if defined(BOOST_CLANG)</span></div><div class="line"><a name="l00208"></a><span class="lineno">  208</span>&#160;<span class="preprocessor">#pragma clang diagnostic pop</span></div><div class="line"><a name="l00209"></a><span class="lineno">  209</span>&#160;<span class="preprocessor">#endif</span></div><div class="line"><a name="l00210"></a><span class="lineno">  210</span>&#160;</div><div class="line"><a name="l00211"></a><span class="lineno">  211</span>&#160;<span class="preprocessor">#if defined(BOOST_GCC) &amp;&amp; (BOOST_GCC &gt;= 40900)</span></div><div class="line"><a name="l00212"></a><span class="lineno">  212</span>&#160;<span class="preprocessor">#pragma GCC diagnostic pop</span></div><div class="line"><a name="l00213"></a><span class="lineno">  213</span>&#160;<span class="preprocessor">#endif</span></div><div class="line"><a name="l00214"></a><span class="lineno">  214</span>&#160;</div><div class="line"><a name="l00215"></a><span class="lineno">  215</span>&#160;<span class="preprocessor">#endif</span></div><div class="ttc" id="structboost_1_1gil_1_1detail_1_1_channel_is_mutable_concept_html"><div class="ttname"><a href="structboost_1_1gil_1_1detail_1_1_channel_is_mutable_concept.html">boost::gil::detail::ChannelIsMutableConcept</a></div><div class="ttdef"><b>Definition:</b> concepts/channel.hpp:97</div></div>
  51 <div class="ttc" id="group___channel_convert_algorithm_html_ga1ca10b1d27bc2f2ce4906b8890e613a5"><div class="ttname"><a href="group___channel_convert_algorithm.html#ga1ca10b1d27bc2f2ce4906b8890e613a5">boost::gil::channel_convert</a></div><div class="ttdeci">channel_traits&lt; DstChannel &gt;::value_type channel_convert(const SrcChannel &amp;src)</div><div class="ttdoc">Converting from one channel type to another.</div><div class="ttdef"><b>Definition:</b> channel_algorithm.hpp:451</div></div>
  52 <div class="ttc" id="structboost_1_1gil_1_1_channel_convertible_concept_html"><div class="ttname"><a href="structboost_1_1gil_1_1_channel_convertible_concept.html">boost::gil::ChannelConvertibleConcept</a></div><div class="ttdoc">A channel is convertible to another one if the channel_convert algorithm is defined for the two chann...</div><div class="ttdef"><b>Definition:</b> concepts/channel.hpp:192</div></div>
  53 <div class="ttc" id="structboost_1_1gil_1_1_channel_concept_html"><div class="ttname"><a href="structboost_1_1gil_1_1_channel_concept.html">boost::gil::ChannelConcept</a></div><div class="ttdoc">A channel is the building block of a color. Color is defined as a mixture of primary colors and a cha...</div><div class="ttdef"><b>Definition:</b> concepts/channel.hpp:73</div></div>
  54 <div class="ttc" id="structboost_1_1gil_1_1_channel_value_concept_html"><div class="ttname"><a href="structboost_1_1gil_1_1_channel_value_concept.html">boost::gil::ChannelValueConcept</a></div><div class="ttdoc">A channel that supports default construction.</div><div class="ttdef"><b>Definition:</b> concepts/channel.hpp:132</div></div>
  55 <div class="ttc" id="structboost_1_1gil_1_1channels__are__compatible_html"><div class="ttname"><a href="structboost_1_1gil_1_1channels__are__compatible.html">boost::gil::channels_are_compatible</a></div><div class="ttdoc">Predicate metafunction returning whether two channels are compatible.</div><div class="ttdef"><b>Definition:</b> concepts/channel.hpp:153</div></div>
  56 <div class="ttc" id="group___packed_channel_reference_model_html_ga70de3c85964650c16afcc42c02bd5df9"><div class="ttname"><a href="group___packed_channel_reference_model.html#ga70de3c85964650c16afcc42c02bd5df9">std::swap</a></div><div class="ttdeci">void swap(boost::gil::packed_channel_reference&lt; BF, FB, NB, M &gt; const x, R &amp;y)</div><div class="ttdoc">swap for packed_channel_reference</div><div class="ttdef"><b>Definition:</b> channel.hpp:529</div></div>
  57 <div class="ttc" id="structboost_1_1gil_1_1_channels_compatible_concept_html"><div class="ttname"><a href="structboost_1_1gil_1_1_channels_compatible_concept.html">boost::gil::ChannelsCompatibleConcept</a></div><div class="ttdoc">Channels are compatible if their associated value types (ignoring constness and references) are the s...</div><div class="ttdef"><b>Definition:</b> concepts/channel.hpp:172</div></div>
  58 <div class="ttc" id="structboost_1_1gil_1_1_mutable_channel_concept_html"><div class="ttname"><a href="structboost_1_1gil_1_1_mutable_channel_concept.html">boost::gil::MutableChannelConcept</a></div><div class="ttdoc">A channel that allows for modifying its value.</div><div class="ttdef"><b>Definition:</b> concepts/channel.hpp:117</div></div>
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