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<div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="comment">// Boost.GIL (Generic Image Library)</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="comment">//</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span><span class="comment">// Copyright (c) 2015, Oracle and/or its affiliates.</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span><span class="comment">// Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="comment">//</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span><span class="comment">// Copyright (c) 2020, Debabrata Mandal &lt;mandaldebabrata123@gmail.com&gt;</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="comment">//</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="comment">// Licensed under the Boost Software License version 1.0.</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="comment">// http://www.boost.org/users/license.html</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span><span class="comment">//</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span><span class="comment">// Source: Boost.Geometry (aka GGL, Generic Geometry Library)</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span><span class="comment">// Modifications: adapted for Boost.GIL</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span><span class="comment">// - Rename namespace boost::geometry to boost::gil</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span><span class="comment">// - Rename include guards</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span><span class="comment">// - Remove support for boost::multiprecision types</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span><span class="comment">// - Remove support for 128-bit integer types</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span><span class="comment">// - Replace mpl meta functions with mp11 equivalents</span></div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span><span class="comment">//</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span><span class="preprocessor">#ifndef BOOST_GIL_PROMOTE_INTEGRAL_HPP</span></div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span><span class="preprocessor">#define BOOST_GIL_PROMOTE_INTEGRAL_HPP</span></div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span> </div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span><span class="preprocessor">#include &lt;boost/mp11/list.hpp&gt;</span></div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span> </div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span><span class="preprocessor">#include &lt;climits&gt;</span></div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span><span class="preprocessor">#include &lt;cstddef&gt;</span></div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span><span class="preprocessor">#include &lt;type_traits&gt;</span></div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span> </div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceboost.html">boost</a> { <span class="keyword">namespace </span>gil</div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span>{</div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span> </div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span><span class="keyword">namespace </span>detail { <span class="keyword">namespace </span>promote_integral</div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span>{</div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span> </div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span><span class="comment">// meta-function that returns the bit size of a type</span></div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span><span class="keyword">template</span></div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span>&lt;</div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span> <span class="keyword">typename</span> T,</div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span> <span class="keywordtype">bool</span> IsFundamental = std::is_fundamental&lt;T&gt;::value</div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span>&gt;</div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span><span class="keyword">struct </span>bit_size {};</div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span> </div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span><span class="comment">// for fundamental types, just return CHAR_BIT * sizeof(T)</span></div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span><span class="keyword">struct </span>bit_size&lt;T, true&gt; : std::integral_constant&lt;std::size_t, (CHAR_BIT * sizeof(T))&gt; {};</div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> </div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span><span class="keyword">template</span></div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span>&lt;</div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> <span class="keyword">typename</span> T,</div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span> <span class="keyword">typename</span> IntegralTypes,</div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span> std::size_t MinSize</div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span>&gt;</div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span><span class="keyword">struct </span>promote_to_larger</div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span>{</div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span> <span class="keyword">using </span>current_type = boost::mp11::mp_first&lt;IntegralTypes&gt;;</div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> <span class="keyword">using </span>list_after_front = boost::mp11::mp_rest&lt;IntegralTypes&gt;;</div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span> </div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span> <span class="keyword">using </span>type = <span class="keyword">typename</span> std::conditional</div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span> &lt;</div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span> (bit_size&lt;current_type&gt;::value &gt;= MinSize),</div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> current_type,</div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> <span class="keyword">typename</span> promote_to_larger</div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> &lt;</div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> T,</div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> list_after_front,</div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> MinSize</div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> &gt;::type</div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> &gt;::type;</div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span>};</div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> </div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span><span class="comment">// The following specialization is required to finish the loop over</span></div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span><span class="comment">// all list elements</span></div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> T, std::<span class="keywordtype">size_t</span> MinSize&gt;</div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span><span class="keyword">struct </span>promote_to_larger&lt;T, <a class="code hl_namespace" href="namespaceboost.html">boost</a>::mp11::mp_list&lt;&gt;, MinSize&gt;</div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span>{</div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> <span class="comment">// if promotion fails, keep the number T</span></div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span> <span class="comment">// (and cross fingers that overflow will not occur)</span></div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span> <span class="keyword">using </span>type = T;</div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span>};</div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span> </div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span>}} <span class="comment">// namespace detail::promote_integral</span></div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span> </div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno"> 114</span><span class="keyword">template</span></div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno"> 115</span>&lt;</div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno"> 116</span> <span class="keyword">typename</span> T,</div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno"> 117</span> <span class="keywordtype">bool</span> PromoteUnsignedToUnsigned = <span class="keyword">false</span>,</div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno"> 118</span> <span class="keywordtype">bool</span> UseCheckedInteger = <span class="keyword">false</span>,</div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno"> 119</span> <span class="keywordtype">bool</span> IsIntegral = std::is_integral&lt;T&gt;::value</div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno"> 120</span>&gt;</div>
<div class="foldopen" id="foldopen00121" data-start="{" data-end="};">
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno"><a class="line" href="classboost_1_1gil_1_1promote__integral.html"> 121</a></span><span class="keyword">class </span><a class="code hl_class" href="classboost_1_1gil_1_1promote__integral.html">promote_integral</a></div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno"> 122</span>{</div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno"> 123</span><span class="keyword">private</span>:</div>
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno"> 124</span> <span class="keyword">static</span> <span class="keywordtype">bool</span> <span class="keyword">const</span> is_unsigned = std::is_unsigned&lt;T&gt;::value;</div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno"> 125</span> </div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno"> 126</span> <span class="keyword">using </span>bit_size_type = detail::promote_integral::bit_size&lt;T&gt;;</div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno"> 127</span> </div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno"> 128</span> <span class="comment">// Define the minimum size (in bits) needed for the promoted type</span></div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno"> 129</span> <span class="comment">// If T is the input type and P the promoted type, then the</span></div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno"> 130</span> <span class="comment">// minimum number of bits for P are (below b stands for the number</span></div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno"> 131</span> <span class="comment">// of bits of T):</span></div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno"> 132</span> <span class="comment">// * if T is unsigned and P is unsigned: 2 * b</span></div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno"> 133</span> <span class="comment">// * if T is signed and P is signed: 2 * b - 1</span></div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno"> 134</span> <span class="comment">// * if T is unsigned and P is signed: 2 * b + 1</span></div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno"> 135</span> <span class="keyword">using </span>min_bit_size_type = <span class="keyword">typename</span> std::conditional</div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno"> 136</span> &lt;</div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno"> 137</span> (PromoteUnsignedToUnsigned &amp;&amp; is_unsigned),</div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno"> 138</span> std::integral_constant&lt;std::size_t, (2 * bit_size_type::value)&gt;,</div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno"> 139</span> <span class="keyword">typename</span> std::conditional</div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno"> 140</span> &lt;</div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno"> 141</span> is_unsigned,</div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno"> 142</span> std::integral_constant&lt;std::size_t, (2 * bit_size_type::value + 1)&gt;,</div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno"> 143</span> std::integral_constant&lt;std::size_t, (2 * bit_size_type::value - 1)&gt;</div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno"> 144</span> &gt;::type</div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno"> 145</span> &gt;::type;</div>
<div class="line"><a id="l00146" name="l00146"></a><span class="lineno"> 146</span> </div>
<div class="line"><a id="l00147" name="l00147"></a><span class="lineno"> 147</span> <span class="comment">// Define the list of signed integral types we are going to use</span></div>
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno"> 148</span> <span class="comment">// for promotion</span></div>
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno"> 149</span> <span class="keyword">using </span>signed_integral_types = boost::mp11::mp_list</div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno"> 150</span> &lt;</div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno"> 151</span> short, int, <span class="keywordtype">long</span></div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno"> 152</span><span class="preprocessor">#if defined(BOOST_HAS_LONG_LONG)</span></div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno"> 153</span> , boost::long_long_type</div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno"> 154</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno"> 155</span> &gt;;</div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno"> 156</span> </div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno"> 157</span> <span class="comment">// Define the list of unsigned integral types we are going to use</span></div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno"> 158</span> <span class="comment">// for promotion</span></div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno"> 159</span> <span class="keyword">using </span>unsigned_integral_types = boost::mp11::mp_list</div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno"> 160</span> &lt;</div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno"> 161</span> <span class="keywordtype">unsigned</span> short, <span class="keywordtype">unsigned</span> int, <span class="keywordtype">unsigned</span> long, std::size_t</div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno"> 162</span><span class="preprocessor">#if defined(BOOST_HAS_LONG_LONG)</span></div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno"> 163</span> , boost::ulong_long_type</div>
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno"> 164</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno"> 165</span> &gt;;</div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno"> 166</span> </div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno"> 167</span> <span class="comment">// Define the list of integral types that will be used for</span></div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno"> 168</span> <span class="comment">// promotion (depending in whether we was to promote unsigned to</span></div>
<div class="line"><a id="l00169" name="l00169"></a><span class="lineno"> 169</span> <span class="comment">// unsigned or not)</span></div>
<div class="line"><a id="l00170" name="l00170"></a><span class="lineno"> 170</span> <span class="keyword">using </span>integral_types = <span class="keyword">typename</span> std::conditional</div>
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno"> 171</span> &lt;</div>
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno"> 172</span> (is_unsigned &amp;&amp; PromoteUnsignedToUnsigned),</div>
<div class="line"><a id="l00173" name="l00173"></a><span class="lineno"> 173</span> unsigned_integral_types,</div>
<div class="line"><a id="l00174" name="l00174"></a><span class="lineno"> 174</span> signed_integral_types</div>
<div class="line"><a id="l00175" name="l00175"></a><span class="lineno"> 175</span> &gt;::type;</div>
<div class="line"><a id="l00176" name="l00176"></a><span class="lineno"> 176</span> </div>
<div class="line"><a id="l00177" name="l00177"></a><span class="lineno"> 177</span><span class="keyword">public</span>:</div>
<div class="line"><a id="l00178" name="l00178"></a><span class="lineno"> 178</span> <span class="keyword">using </span>type = <span class="keyword">typename</span> detail::promote_integral::promote_to_larger</div>
<div class="line"><a id="l00179" name="l00179"></a><span class="lineno"> 179</span> &lt;</div>
<div class="line"><a id="l00180" name="l00180"></a><span class="lineno"> 180</span> T,</div>
<div class="line"><a id="l00181" name="l00181"></a><span class="lineno"> 181</span> integral_types,</div>
<div class="line"><a id="l00182" name="l00182"></a><span class="lineno"> 182</span> min_bit_size_type::value</div>
<div class="line"><a id="l00183" name="l00183"></a><span class="lineno"> 183</span> &gt;::type;</div>
<div class="line"><a id="l00184" name="l00184"></a><span class="lineno"> 184</span>};</div>
</div>
<div class="line"><a id="l00185" name="l00185"></a><span class="lineno"> 185</span> </div>
<div class="line"><a id="l00186" name="l00186"></a><span class="lineno"> 186</span> </div>
<div class="line"><a id="l00187" name="l00187"></a><span class="lineno"> 187</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> T, <span class="keywordtype">bool</span> PromoteUn<span class="keywordtype">signed</span>ToUn<span class="keywordtype">signed</span>, <span class="keywordtype">bool</span> UseCheckedInteger&gt;</div>
<div class="line"><a id="l00188" name="l00188"></a><span class="lineno"> 188</span><span class="keyword">class </span><a class="code hl_class" href="classboost_1_1gil_1_1promote__integral.html">promote_integral</a></div>
<div class="line"><a id="l00189" name="l00189"></a><span class="lineno"> 189</span> &lt;</div>
<div class="line"><a id="l00190" name="l00190"></a><span class="lineno"> 190</span> T, PromoteUnsignedToUnsigned, UseCheckedInteger, false</div>
<div class="line"><a id="l00191" name="l00191"></a><span class="lineno"> 191</span> &gt;</div>
<div class="line"><a id="l00192" name="l00192"></a><span class="lineno"> 192</span>{</div>
<div class="line"><a id="l00193" name="l00193"></a><span class="lineno"> 193</span><span class="keyword">public</span>:</div>
<div class="line"><a id="l00194" name="l00194"></a><span class="lineno"> 194</span> <span class="keyword">using </span>type = T;</div>
<div class="line"><a id="l00195" name="l00195"></a><span class="lineno"> 195</span>};</div>
<div class="line"><a id="l00196" name="l00196"></a><span class="lineno"> 196</span> </div>
<div class="line"><a id="l00197" name="l00197"></a><span class="lineno"> 197</span>}} <span class="comment">// namespace boost::gil</span></div>
<div class="line"><a id="l00198" name="l00198"></a><span class="lineno"> 198</span> </div>
<div class="line"><a id="l00199" name="l00199"></a><span class="lineno"> 199</span><span class="preprocessor">#endif </span><span class="comment">// BOOST_GIL_PROMOTE_INTEGRAL_HPP</span></div>
<div class="ttc" id="aclassboost_1_1gil_1_1promote__integral_html"><div class="ttname"><a href="classboost_1_1gil_1_1promote__integral.html">boost::gil::promote_integral</a></div><div class="ttdoc">Meta-function to define an integral type with size than is (roughly) twice the bit size of T.</div><div class="ttdef"><b>Definition</b> promote_integral.hpp:122</div></div>
<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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