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<div class="title">channel_numeric_operations.hpp</div> </div>
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<div class="contents">
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">// Copyright 2005-2007 Adobe Systems Incorporated</span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// Copyright 2021 Pranam Lashkari <plashkari628@gmail.com></span></div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">// Distributed under the Boost Software License, Version 1.0</span></div>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">// See accompanying file LICENSE_1_0.txt or copy at</span></div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">// http://www.boost.org/LICENSE_1_0.txt</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#ifndef BOOST_GIL_CHANNEL_NUMERIC_OPERATIONS_HPP</span></div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor">#define BOOST_GIL_CHANNEL_NUMERIC_OPERATIONS_HPP</span></div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>  </div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#include <boost/gil/channel.hpp></span></div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>  </div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="keyword">namespace </span><a class="code" href="namespaceboost.html">boost</a> { <span class="keyword">namespace </span>gil {</div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>  </div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment">// Function objects and utilities for channel-wise numeric operations.</span></div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment">// List of currently defined functors:</span></div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment">// channel_plus_t (+)</span></div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment">// channel_minus_t (-)</span></div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment">// channel_multiplies_t (*)</span></div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment">// channel_divides_t (/),</span></div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment">// channel_plus_scalar_t (+s)</span></div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment">// channel_minus_scalar_t (-s),</span></div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment">// channel_multiplies_scalar_t (*s)</span></div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment">// channel_divides_scalar_t (/s),</span></div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment">// channel_halves_t (/=2)</span></div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment">// channel_zeros_t (=0)</span></div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment">// channel_assigns_t (=)</span></div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  </div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Channel1, <span class="keyword">typename</span> Channel2, <span class="keyword">typename</span> ChannelResult></div>
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<div class="line"><a name="l00035"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__plus__t.html"> 35</a></span> <span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1channel__plus__t.html">channel_plus_t</a></div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> {</div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <span class="keyword">using</span> ChannelRef1 = <span class="keyword">typename</span> channel_traits<Channel1>::const_reference;</div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="keyword">using</span> ChannelRef2 = <span class="keyword">typename</span> channel_traits<Channel2>::const_reference;</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  static_assert(std::is_convertible<ChannelRef1, ChannelResult>::value,</div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="stringliteral">"ChannelRef1 not convertible to ChannelResult"</span>);</div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  static_assert(std::is_convertible<ChannelRef2, ChannelResult>::value,</div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="stringliteral">"ChannelRef2 not convertible to ChannelResult"</span>);</div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  </div>
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<div class="line"><a name="l00046"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__plus__t.html#a1fa35f151b172e35ca3d112ad7d82592"> 46</a></span>  <span class="keyword">auto</span> <a class="code" href="structboost_1_1gil_1_1channel__plus__t.html#a1fa35f151b172e35ca3d112ad7d82592">operator()</a>(ChannelRef1 ch1, ChannelRef2 ch2) <span class="keyword">const</span> -> ChannelResult</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  {</div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="keywordflow">return</span> ChannelResult(ch1) + ChannelResult(ch2);</div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  }</div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> };</div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  </div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Channel1, <span class="keyword">typename</span> Channel2, <span class="keyword">typename</span> ChannelResult></div>
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<div class="line"><a name="l00056"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__minus__t.html"> 56</a></span> <span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1channel__minus__t.html">channel_minus_t</a></div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> {</div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keyword">using</span> ChannelRef1 = <span class="keyword">typename</span> channel_traits<Channel1>::const_reference;</div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keyword">using</span> ChannelRef2 = <span class="keyword">typename</span> channel_traits<Channel2>::const_reference;</div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  static_assert(std::is_convertible<ChannelRef1, ChannelResult>::value,</div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="stringliteral">"ChannelRef1 not convertible to ChannelResult"</span>);</div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  static_assert(std::is_convertible<ChannelRef2, ChannelResult>::value,</div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="stringliteral">"ChannelRef2 not convertible to ChannelResult"</span>);</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  </div>
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<div class="line"><a name="l00067"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__minus__t.html#a1fa35f151b172e35ca3d112ad7d82592"> 67</a></span>  <span class="keyword">auto</span> <a class="code" href="structboost_1_1gil_1_1channel__minus__t.html#a1fa35f151b172e35ca3d112ad7d82592">operator()</a>(ChannelRef1 ch1, ChannelRef2 ch2) <span class="keyword">const</span> -> ChannelResult</div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  {</div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keywordflow">return</span> ChannelResult(ch1) - ChannelResult(ch2);</div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  }</div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> };</div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  </div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Channel1, <span class="keyword">typename</span> Channel2, <span class="keyword">typename</span> ChannelResult></div>
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<div class="line"><a name="l00077"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__multiplies__t.html"> 77</a></span> <span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1channel__multiplies__t.html">channel_multiplies_t</a></div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span> {</div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="keyword">using</span> ChannelRef1 = <span class="keyword">typename</span> channel_traits<Channel1>::const_reference;</div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="keyword">using</span> ChannelRef2 = <span class="keyword">typename</span> channel_traits<Channel2>::const_reference;</div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  static_assert(std::is_convertible<ChannelRef1, ChannelResult>::value,</div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="stringliteral">"ChannelRef1 not convertible to ChannelResult"</span>);</div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  static_assert(std::is_convertible<ChannelRef2, ChannelResult>::value,</div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="stringliteral">"ChannelRef2 not convertible to ChannelResult"</span>);</div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  </div>
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<div class="line"><a name="l00088"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__multiplies__t.html#a1fa35f151b172e35ca3d112ad7d82592"> 88</a></span>  <span class="keyword">auto</span> <a class="code" href="structboost_1_1gil_1_1channel__multiplies__t.html#a1fa35f151b172e35ca3d112ad7d82592">operator()</a>(ChannelRef1 ch1, ChannelRef2 ch2) <span class="keyword">const</span> -> ChannelResult</div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  {</div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keywordflow">return</span> ChannelResult(ch1) * ChannelResult(ch2);</div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  }</div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> };</div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  </div>
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<div class="line"><a name="l00097"></a><span class="lineno"> 97</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Channel1, <span class="keyword">typename</span> Channel2, <span class="keyword">typename</span> ChannelResult></div>
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<div class="line"><a name="l00098"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__divides__t.html"> 98</a></span> <span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1channel__divides__t.html">channel_divides_t</a></div>
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<div class="line"><a name="l00099"></a><span class="lineno"> 99</span> {</div>
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<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="keyword">using</span> ChannelRef1 = <span class="keyword">typename</span> channel_traits<Channel1>::const_reference;</div>
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<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="keyword">using</span> ChannelRef2 = <span class="keyword">typename</span> channel_traits<Channel2>::const_reference;</div>
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<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  static_assert(std::is_convertible<ChannelRef1, ChannelResult>::value,</div>
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<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="stringliteral">"ChannelRef1 not convertible to ChannelResult"</span>);</div>
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<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  static_assert(std::is_convertible<ChannelRef2, ChannelResult>::value,</div>
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<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="stringliteral">"ChannelRef2 not convertible to ChannelResult"</span>);</div>
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<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  </div>
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<div class="line"><a name="l00109"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__divides__t.html#a1fa35f151b172e35ca3d112ad7d82592"> 109</a></span>  <span class="keyword">auto</span> <a class="code" href="structboost_1_1gil_1_1channel__divides__t.html#a1fa35f151b172e35ca3d112ad7d82592">operator()</a>(ChannelRef1 ch1, ChannelRef2 ch2) <span class="keyword">const</span> -> ChannelResult</div>
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<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  {</div>
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<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="keywordflow">return</span> ChannelResult(ch1) / ChannelResult(ch2);</div>
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<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  }</div>
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<div class="line"><a name="l00113"></a><span class="lineno"> 113</span> };</div>
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<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  </div>
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<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Channel, <span class="keyword">typename</span> Scalar, <span class="keyword">typename</span> ChannelResult></div>
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<div class="line"><a name="l00119"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__plus__scalar__t.html"> 119</a></span> <span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1channel__plus__scalar__t.html">channel_plus_scalar_t</a></div>
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<div class="line"><a name="l00120"></a><span class="lineno"> 120</span> {</div>
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<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="keyword">using</span> ChannelRef = <span class="keyword">typename</span> channel_traits<Channel>::const_reference;</div>
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<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  static_assert(std::is_convertible<ChannelRef, ChannelResult>::value,</div>
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<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <span class="stringliteral">"ChannelRef not convertible to ChannelResult"</span>);</div>
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<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  static_assert(std::is_scalar<Scalar>::value, <span class="stringliteral">"Scalar not a scalar"</span>);</div>
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<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  static_assert(std::is_convertible<Scalar, ChannelResult>::value,</div>
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<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="stringliteral">"Scalar not convertible to ChannelResult"</span>);</div>
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<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  </div>
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<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  <span class="keyword">auto</span> operator()(ChannelRef channel, Scalar <span class="keyword">const</span>& scalar) <span class="keyword">const</span> -> ChannelResult</div>
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<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  {</div>
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<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  <span class="keywordflow">return</span> ChannelResult(channel) + ChannelResult(scalar);</div>
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<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  }</div>
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<div class="line"><a name="l00132"></a><span class="lineno"> 132</span> };</div>
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<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  </div>
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<div class="line"><a name="l00137"></a><span class="lineno"> 137</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Channel, <span class="keyword">typename</span> Scalar, <span class="keyword">typename</span> ChannelResult></div>
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<div class="line"><a name="l00138"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__minus__scalar__t.html"> 138</a></span> <span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1channel__minus__scalar__t.html">channel_minus_scalar_t</a></div>
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<div class="line"><a name="l00139"></a><span class="lineno"> 139</span> {</div>
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<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  <span class="keyword">using</span> ChannelRef = <span class="keyword">typename</span> channel_traits<Channel>::const_reference;</div>
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<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  static_assert(std::is_convertible<ChannelRef, ChannelResult>::value,</div>
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<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  <span class="stringliteral">"ChannelRef not convertible to ChannelResult"</span>);</div>
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<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  static_assert(std::is_scalar<Scalar>::value, <span class="stringliteral">"Scalar not a scalar"</span>);</div>
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<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  static_assert(std::is_convertible<Scalar, ChannelResult>::value,</div>
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<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  <span class="stringliteral">"Scalar not convertible to ChannelResult"</span>);</div>
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<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  </div>
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<div class="line"><a name="l00149"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__minus__scalar__t.html#a05d48ef4b2292805a8b7e538162395e4"> 149</a></span>  <span class="keyword">auto</span> <a class="code" href="structboost_1_1gil_1_1channel__minus__scalar__t.html#a05d48ef4b2292805a8b7e538162395e4">operator()</a>(ChannelRef channel, Scalar <span class="keyword">const</span>& scalar) <span class="keyword">const</span> -> ChannelResult</div>
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<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  {</div>
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<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  <span class="comment">// TODO: Convertion after subtraction vs conversion of operands in channel_minus_t?</span></div>
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<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  <span class="keywordflow">return</span> ChannelResult(channel - scalar);</div>
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<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  }</div>
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<div class="line"><a name="l00154"></a><span class="lineno"> 154</span> };</div>
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<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  </div>
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<div class="line"><a name="l00159"></a><span class="lineno"> 159</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Channel, <span class="keyword">typename</span> Scalar, <span class="keyword">typename</span> ChannelResult></div>
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<div class="line"><a name="l00160"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__multiplies__scalar__t.html"> 160</a></span> <span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1channel__multiplies__scalar__t.html">channel_multiplies_scalar_t</a></div>
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<div class="line"><a name="l00161"></a><span class="lineno"> 161</span> {</div>
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<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  <span class="keyword">using</span> ChannelRef = <span class="keyword">typename</span> channel_traits<Channel>::const_reference;</div>
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<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  static_assert(std::is_convertible<ChannelRef, ChannelResult>::value,</div>
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<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  <span class="stringliteral">"ChannelRef not convertible to ChannelResult"</span>);</div>
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<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  static_assert(std::is_scalar<Scalar>::value, <span class="stringliteral">"Scalar not a scalar"</span>);</div>
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<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  static_assert(std::is_convertible<Scalar, ChannelResult>::value,</div>
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<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  <span class="stringliteral">"Scalar not convertible to ChannelResult"</span>);</div>
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<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  </div>
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<div class="line"><a name="l00171"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__multiplies__scalar__t.html#a05d48ef4b2292805a8b7e538162395e4"> 171</a></span>  <span class="keyword">auto</span> <a class="code" href="structboost_1_1gil_1_1channel__multiplies__scalar__t.html#a05d48ef4b2292805a8b7e538162395e4">operator()</a>(ChannelRef channel, Scalar <span class="keyword">const</span>& scalar) <span class="keyword">const</span> -> ChannelResult</div>
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<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  {</div>
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<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  <span class="keywordflow">return</span> ChannelResult(channel) * ChannelResult(scalar);</div>
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<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  }</div>
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<div class="line"><a name="l00175"></a><span class="lineno"> 175</span> };</div>
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<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  </div>
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<div class="line"><a name="l00180"></a><span class="lineno"> 180</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Channel, <span class="keyword">typename</span> Scalar, <span class="keyword">typename</span> ChannelResult></div>
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<div class="line"><a name="l00181"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__divides__scalar__t.html"> 181</a></span> <span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1channel__divides__scalar__t.html">channel_divides_scalar_t</a></div>
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<div class="line"><a name="l00182"></a><span class="lineno"> 182</span> {</div>
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<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  <span class="keyword">using</span> ChannelRef = <span class="keyword">typename</span> channel_traits<Channel>::const_reference;</div>
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<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  static_assert(std::is_convertible<ChannelRef, ChannelResult>::value,</div>
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<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  <span class="stringliteral">"ChannelRef not convertible to ChannelResult"</span>);</div>
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<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  static_assert(std::is_scalar<Scalar>::value, <span class="stringliteral">"Scalar not a scalar"</span>);</div>
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<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  static_assert(std::is_convertible<Scalar, ChannelResult>::value,</div>
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<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  <span class="stringliteral">"Scalar not convertible to ChannelResult"</span>);</div>
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<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  </div>
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<div class="line"><a name="l00192"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__divides__scalar__t.html#a05d48ef4b2292805a8b7e538162395e4"> 192</a></span>  <span class="keyword">auto</span> <a class="code" href="structboost_1_1gil_1_1channel__divides__scalar__t.html#a05d48ef4b2292805a8b7e538162395e4">operator()</a>(ChannelRef channel, Scalar <span class="keyword">const</span>& scalar) <span class="keyword">const</span> -> ChannelResult</div>
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<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  {</div>
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<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  <span class="keywordflow">return</span> ChannelResult(channel) / ChannelResult(scalar);</div>
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<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  }</div>
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<div class="line"><a name="l00196"></a><span class="lineno"> 196</span> };</div>
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<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  </div>
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<div class="line"><a name="l00201"></a><span class="lineno"> 201</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Channel></div>
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<div class="line"><a name="l00202"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__halves__t.html"> 202</a></span> <span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1channel__halves__t.html">channel_halves_t</a></div>
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<div class="line"><a name="l00203"></a><span class="lineno"> 203</span> {</div>
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<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  <span class="keyword">using</span> ChannelRef = <span class="keyword">typename</span> channel_traits<Channel>::reference;</div>
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<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  </div>
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<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  <span class="keyword">auto</span> operator()(ChannelRef channel) <span class="keyword">const</span> -> ChannelRef</div>
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<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  {</div>
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<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  <span class="comment">// TODO: Split into steps: extract with explicit conversion to double, divide and assign?</span></div>
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<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  <span class="comment">//double const v = ch;</span></div>
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<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  <span class="comment">//ch = static_cast<Channel>(v / 2.0);</span></div>
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<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  channel /= 2.0;</div>
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<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  <span class="keywordflow">return</span> channel;</div>
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<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  }</div>
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<div class="line"><a name="l00214"></a><span class="lineno"> 214</span> };</div>
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<div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  </div>
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<div class="line"><a name="l00219"></a><span class="lineno"> 219</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Channel></div>
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<div class="line"><a name="l00220"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__zeros__t.html"> 220</a></span> <span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1channel__zeros__t.html">channel_zeros_t</a></div>
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<div class="line"><a name="l00221"></a><span class="lineno"> 221</span> {</div>
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<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  <span class="keyword">using</span> ChannelRef = <span class="keyword">typename</span> channel_traits<Channel>::reference;</div>
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<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  </div>
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<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  <span class="keyword">auto</span> operator()(ChannelRef channel) <span class="keyword">const</span> -> ChannelRef</div>
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<div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  {</div>
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<div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  channel = Channel(0);</div>
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<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  <span class="keywordflow">return</span> channel;</div>
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<div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  }</div>
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<div class="line"><a name="l00229"></a><span class="lineno"> 229</span> };</div>
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<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  </div>
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<div class="line"><a name="l00234"></a><span class="lineno"> 234</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Channel1, <span class="keyword">typename</span> Channel2></div>
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<div class="line"><a name="l00235"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__assigns__t.html"> 235</a></span> <span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1channel__assigns__t.html">channel_assigns_t</a></div>
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<div class="line"><a name="l00236"></a><span class="lineno"> 236</span> {</div>
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<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  <span class="keyword">using</span> ChannelRef1 = <span class="keyword">typename</span> channel_traits<Channel1>::const_reference;</div>
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<div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  <span class="keyword">using</span> ChannelRef2 = <span class="keyword">typename</span> channel_traits<Channel2>::reference;</div>
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<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  static_assert(std::is_convertible<ChannelRef1, Channel2>::value,</div>
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<div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  <span class="stringliteral">"ChannelRef1 not convertible to Channel2"</span>);</div>
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<div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  </div>
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<div class="line"><a name="l00244"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__assigns__t.html#aadf200f27049a8dcd611b002e328f687"> 244</a></span>  <span class="keyword">auto</span> <a class="code" href="structboost_1_1gil_1_1channel__assigns__t.html#aadf200f27049a8dcd611b002e328f687">operator()</a>(ChannelRef1 ch1, ChannelRef2 ch2) <span class="keyword">const</span> -> ChannelRef2</div>
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<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  {</div>
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<div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  ch2 = Channel2(ch1);</div>
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<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  <span class="keywordflow">return</span> ch2;</div>
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<div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  }</div>
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<div class="line"><a name="l00249"></a><span class="lineno"> 249</span> };</div>
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<div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  </div>
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<div class="line"><a name="l00251"></a><span class="lineno"> 251</span> }} <span class="comment">// namespace boost::gil</span></div>
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<div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  </div>
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<div class="line"><a name="l00253"></a><span class="lineno"> 253</span> <span class="preprocessor">#endif</span></div>
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<div class="ttc" id="anamespaceboost_html"><div class="ttname"><a href="namespaceboost.html">boost</a></div><div class="ttdoc">defined(BOOST_NO_CXX17_HDR_MEMORY_RESOURCE)</div><div class="ttdef"><b>Definition:</b> algorithm.hpp:36</div></div>
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<div class="ttc" id="astructboost_1_1gil_1_1channel__assigns__t_html"><div class="ttname"><a href="structboost_1_1gil_1_1channel__assigns__t.html">boost::gil::channel_assigns_t</a></div><div class="ttdef"><b>Definition:</b> channel_numeric_operations.hpp:236</div></div>
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<div class="ttc" id="astructboost_1_1gil_1_1channel__assigns__t_html_aadf200f27049a8dcd611b002e328f687"><div class="ttname"><a href="structboost_1_1gil_1_1channel__assigns__t.html#aadf200f27049a8dcd611b002e328f687">boost::gil::channel_assigns_t::operator()</a></div><div class="ttdeci">auto operator()(ChannelRef1 ch1, ChannelRef2 ch2) const -> ChannelRef2</div><div class="ttdef"><b>Definition:</b> channel_numeric_operations.hpp:244</div></div>
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<div class="ttc" id="astructboost_1_1gil_1_1channel__divides__scalar__t_html"><div class="ttname"><a href="structboost_1_1gil_1_1channel__divides__scalar__t.html">boost::gil::channel_divides_scalar_t</a></div><div class="ttdoc">Arithmetic operation of dividing channel value by scalar.</div><div class="ttdef"><b>Definition:</b> channel_numeric_operations.hpp:182</div></div>
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<div class="ttc" id="astructboost_1_1gil_1_1channel__divides__scalar__t_html_a05d48ef4b2292805a8b7e538162395e4"><div class="ttname"><a href="structboost_1_1gil_1_1channel__divides__scalar__t.html#a05d48ef4b2292805a8b7e538162395e4">boost::gil::channel_divides_scalar_t::operator()</a></div><div class="ttdeci">auto operator()(ChannelRef channel, Scalar const &scalar) const -> ChannelResult</div><div class="ttdef"><b>Definition:</b> channel_numeric_operations.hpp:192</div></div>
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<div class="ttc" id="astructboost_1_1gil_1_1channel__divides__t_html"><div class="ttname"><a href="structboost_1_1gil_1_1channel__divides__t.html">boost::gil::channel_divides_t</a></div><div class="ttdoc">Arithmetic operation of division of two channel values.</div><div class="ttdef"><b>Definition:</b> channel_numeric_operations.hpp:99</div></div>
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<div class="ttc" id="astructboost_1_1gil_1_1channel__divides__t_html_a1fa35f151b172e35ca3d112ad7d82592"><div class="ttname"><a href="structboost_1_1gil_1_1channel__divides__t.html#a1fa35f151b172e35ca3d112ad7d82592">boost::gil::channel_divides_t::operator()</a></div><div class="ttdeci">auto operator()(ChannelRef1 ch1, ChannelRef2 ch2) const -> ChannelResult</div><div class="ttdef"><b>Definition:</b> channel_numeric_operations.hpp:109</div></div>
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<div class="ttc" id="astructboost_1_1gil_1_1channel__halves__t_html"><div class="ttname"><a href="structboost_1_1gil_1_1channel__halves__t.html">boost::gil::channel_halves_t</a></div><div class="ttdoc">Arithmetic operation of dividing channel value by 2.</div><div class="ttdef"><b>Definition:</b> channel_numeric_operations.hpp:203</div></div>
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<div class="ttc" id="astructboost_1_1gil_1_1channel__minus__scalar__t_html"><div class="ttname"><a href="structboost_1_1gil_1_1channel__minus__scalar__t.html">boost::gil::channel_minus_scalar_t</a></div><div class="ttdoc">Arithmetic operation of subtracting scalar from channel value.</div><div class="ttdef"><b>Definition:</b> channel_numeric_operations.hpp:139</div></div>
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<div class="ttc" id="astructboost_1_1gil_1_1channel__minus__scalar__t_html_a05d48ef4b2292805a8b7e538162395e4"><div class="ttname"><a href="structboost_1_1gil_1_1channel__minus__scalar__t.html#a05d48ef4b2292805a8b7e538162395e4">boost::gil::channel_minus_scalar_t::operator()</a></div><div class="ttdeci">auto operator()(ChannelRef channel, Scalar const &scalar) const -> ChannelResult</div><div class="ttdef"><b>Definition:</b> channel_numeric_operations.hpp:149</div></div>
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<div class="ttc" id="astructboost_1_1gil_1_1channel__minus__t_html"><div class="ttname"><a href="structboost_1_1gil_1_1channel__minus__t.html">boost::gil::channel_minus_t</a></div><div class="ttdoc">Arithmetic operation of subtraction of two channel values.</div><div class="ttdef"><b>Definition:</b> channel_numeric_operations.hpp:57</div></div>
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<div class="ttc" id="astructboost_1_1gil_1_1channel__minus__t_html_a1fa35f151b172e35ca3d112ad7d82592"><div class="ttname"><a href="structboost_1_1gil_1_1channel__minus__t.html#a1fa35f151b172e35ca3d112ad7d82592">boost::gil::channel_minus_t::operator()</a></div><div class="ttdeci">auto operator()(ChannelRef1 ch1, ChannelRef2 ch2) const -> ChannelResult</div><div class="ttdef"><b>Definition:</b> channel_numeric_operations.hpp:67</div></div>
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<div class="ttc" id="astructboost_1_1gil_1_1channel__multiplies__scalar__t_html"><div class="ttname"><a href="structboost_1_1gil_1_1channel__multiplies__scalar__t.html">boost::gil::channel_multiplies_scalar_t</a></div><div class="ttdoc">Arithmetic operation of channel value by a scalar.</div><div class="ttdef"><b>Definition:</b> channel_numeric_operations.hpp:161</div></div>
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<div class="ttc" id="astructboost_1_1gil_1_1channel__multiplies__scalar__t_html_a05d48ef4b2292805a8b7e538162395e4"><div class="ttname"><a href="structboost_1_1gil_1_1channel__multiplies__scalar__t.html#a05d48ef4b2292805a8b7e538162395e4">boost::gil::channel_multiplies_scalar_t::operator()</a></div><div class="ttdeci">auto operator()(ChannelRef channel, Scalar const &scalar) const -> ChannelResult</div><div class="ttdef"><b>Definition:</b> channel_numeric_operations.hpp:171</div></div>
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<div class="ttc" id="astructboost_1_1gil_1_1channel__multiplies__t_html"><div class="ttname"><a href="structboost_1_1gil_1_1channel__multiplies__t.html">boost::gil::channel_multiplies_t</a></div><div class="ttdoc">Arithmetic operation of multiplication of two channel values.</div><div class="ttdef"><b>Definition:</b> channel_numeric_operations.hpp:78</div></div>
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<div class="ttc" id="astructboost_1_1gil_1_1channel__multiplies__t_html_a1fa35f151b172e35ca3d112ad7d82592"><div class="ttname"><a href="structboost_1_1gil_1_1channel__multiplies__t.html#a1fa35f151b172e35ca3d112ad7d82592">boost::gil::channel_multiplies_t::operator()</a></div><div class="ttdeci">auto operator()(ChannelRef1 ch1, ChannelRef2 ch2) const -> ChannelResult</div><div class="ttdef"><b>Definition:</b> channel_numeric_operations.hpp:88</div></div>
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<div class="ttc" id="astructboost_1_1gil_1_1channel__plus__scalar__t_html"><div class="ttname"><a href="structboost_1_1gil_1_1channel__plus__scalar__t.html">boost::gil::channel_plus_scalar_t</a></div><div class="ttdoc">Arithmetic operation of adding scalar to channel value.</div><div class="ttdef"><b>Definition:</b> channel_numeric_operations.hpp:120</div></div>
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<div class="ttc" id="astructboost_1_1gil_1_1channel__plus__t_html"><div class="ttname"><a href="structboost_1_1gil_1_1channel__plus__t.html">boost::gil::channel_plus_t</a></div><div class="ttdoc">Arithmetic operation of addition of two channel values.</div><div class="ttdef"><b>Definition:</b> channel_numeric_operations.hpp:36</div></div>
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<div class="ttc" id="astructboost_1_1gil_1_1channel__plus__t_html_a1fa35f151b172e35ca3d112ad7d82592"><div class="ttname"><a href="structboost_1_1gil_1_1channel__plus__t.html#a1fa35f151b172e35ca3d112ad7d82592">boost::gil::channel_plus_t::operator()</a></div><div class="ttdeci">auto operator()(ChannelRef1 ch1, ChannelRef2 ch2) const -> ChannelResult</div><div class="ttdef"><b>Definition:</b> channel_numeric_operations.hpp:46</div></div>
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<div class="ttc" id="astructboost_1_1gil_1_1channel__zeros__t_html"><div class="ttname"><a href="structboost_1_1gil_1_1channel__zeros__t.html">boost::gil::channel_zeros_t</a></div><div class="ttdoc">Operation of setting channel value to zero.</div><div class="ttdef"><b>Definition:</b> channel_numeric_operations.hpp:221</div></div>
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