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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_LOCATOR_HPP</span></div><div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="preprocessor">#define BOOST_GIL_LOCATOR_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/dynamic_step.hpp&gt;</span></div><div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="preprocessor">#include &lt;boost/gil/pixel_iterator.hpp&gt;</span></div><div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="preprocessor">#include &lt;boost/gil/point.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/assert.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;cstddef&gt;</span></div><div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;</div><div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;<span class="keyword">namespace </span>boost { <span class="keyword">namespace </span>gil {</div><div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;</div><div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;</div><div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<span class="comment">//forward declarations</span></div><div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> P&gt; std::ptrdiff_t memunit_step(<span class="keyword">const</span> P*);</div><div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> P&gt; P* memunit_advanced(<span class="keyword">const</span> P* p, std::ptrdiff_t diff);</div><div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> P&gt; P&amp; memunit_advanced_ref(P* p, std::ptrdiff_t diff);</div><div class="line"><a name="l00027"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1iterator__add__deref.html">   27</a></span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Iterator, <span class="keyword">typename</span> D&gt; <span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1iterator__add__deref.html">iterator_add_deref</a>;</div><div class="line"><a name="l00028"></a><span class="lineno"><a class="line" href="classboost_1_1gil_1_1point.html">   28</a></span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt; <span class="keyword">class </span><a class="code" href="classboost_1_1gil_1_1point.html">point</a>;</div><div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;<span class="keyword">namespace </span>detail {</div><div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;    <span class="comment">// helper class specialized for each axis of pixel_2d_locator</span></div><div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;    <span class="keyword">template</span> &lt;std::<span class="keywordtype">size_t</span> D, <span class="keyword">typename</span> Loc&gt;  <span class="keyword">class </span>locator_axis;</div><div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;}</div><div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;</div><div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt; <span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1channel__type.html">channel_type</a>;</div><div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt; <span class="keyword">struct </span>color_space_type;</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> T&gt; <span class="keyword">struct </span>channel_mapping_type;</div><div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt; <span class="keyword">struct </span>is_planar;</div><div class="line"><a name="l00038"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1num__channels.html">   38</a></span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt; <span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1num__channels.html">num_channels</a>;</div><div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;</div><div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> LocatorOrView&gt;</div><div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;<span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1transposed__type.html">transposed_type</a></div><div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;{</div><div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;    <span class="keyword">using</span> type = LocatorOrView;</div><div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;};</div><div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;</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;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Loc, <span class="keyword">typename</span> XIterator, <span class="keyword">typename</span> YIterator&gt;    <span class="comment">// The concrete subclass, the X-iterator and the Y-iterator</span></div><div class="line"><a name="l00109"></a><span class="lineno"><a class="line" href="classboost_1_1gil_1_1pixel__2d__locator__base.html">  109</a></span>&#160;<span class="keyword">class </span><a class="code" href="classboost_1_1gil_1_1pixel__2d__locator__base.html">pixel_2d_locator_base</a></div><div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;{</div><div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;<span class="keyword">public</span>:</div><div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;    <span class="keyword">using</span> x_iterator = XIterator;</div><div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;    <span class="keyword">using</span> y_iterator = YIterator;</div><div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;</div><div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;    <span class="comment">// aliasesrequired by ConstRandomAccessNDLocatorConcept</span></div><div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;    <span class="keyword">static</span> <span class="keyword">const</span> std::size_t num_dimensions=2;</div><div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;    <span class="keyword">using</span> value_type = <span class="keyword">typename</span> std::iterator_traits&lt;x_iterator&gt;::value_type;</div><div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;    <span class="keyword">using</span> reference = <span class="keyword">typename</span> std::iterator_traits&lt;x_iterator&gt;::reference;    <span class="comment">// result of dereferencing</span></div><div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;    <span class="keyword">using</span> coord_t = <span class="keyword">typename</span> std::iterator_traits&lt;x_iterator&gt;::difference_type;      <span class="comment">// 1D difference type (same for all dimensions)</span></div><div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;    <span class="keyword">using</span> <a class="code" href="classboost_1_1gil_1_1point.html">difference_type</a> = <a class="code" href="classboost_1_1gil_1_1point.html">point&lt;coord_t&gt;</a>; <span class="comment">// result of operator-(locator,locator)</span></div><div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;    <span class="keyword">using</span> <a class="code" href="classboost_1_1gil_1_1point.html">point_t</a> = <a class="code" href="classboost_1_1gil_1_1point.html">difference_type</a>;</div><div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;    <span class="keyword">template</span> &lt;std::<span class="keywordtype">size_t</span> D&gt; <span class="keyword">struct </span>axis</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;        <span class="keyword">using</span> coord_t = <span class="keyword">typename</span> detail::locator_axis&lt;D,Loc&gt;::coord_t;</div><div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;        <span class="keyword">using</span> iterator = <span class="keyword">typename</span> detail::locator_axis&lt;D,Loc&gt;::iterator;</div><div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;    };</div><div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;</div><div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;<span class="comment">// aliases required by ConstRandomAccess2DLocatorConcept</span></div><div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;    <span class="keyword">using</span> x_coord_t = <span class="keyword">typename</span> point_t::template axis&lt;0&gt;::coord_t;</div><div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;    <span class="keyword">using</span> y_coord_t = <span class="keyword">typename</span> point_t::template axis&lt;1&gt;::coord_t;</div><div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;</div><div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;    <span class="keywordtype">bool</span>              operator!=(<span class="keyword">const</span> Loc&amp; p)<span class="keyword">          const </span>{ <span class="keywordflow">return</span> !(concrete()==p); }</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;    x_iterator        x_at(x_coord_t dx, y_coord_t dy)<span class="keyword">  const </span>{ Loc tmp=concrete(); tmp+=<a class="code" href="classboost_1_1gil_1_1point.html">point_t</a>(dx,dy); <span class="keywordflow">return</span> tmp.x(); }</div><div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;    x_iterator        x_at(<span class="keyword">const</span> <a class="code" href="classboost_1_1gil_1_1point.html">difference_type</a>&amp; d)<span class="keyword">    const </span>{ Loc tmp=concrete(); tmp+=d;              <span class="keywordflow">return</span> tmp.x(); }</div><div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;    y_iterator        y_at(x_coord_t dx, y_coord_t dy)<span class="keyword">  const </span>{ Loc tmp=concrete(); tmp+=<a class="code" href="classboost_1_1gil_1_1point.html">point_t</a>(dx,dy); <span class="keywordflow">return</span> tmp.y(); }</div><div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;    y_iterator        y_at(<span class="keyword">const</span> <a class="code" href="classboost_1_1gil_1_1point.html">difference_type</a>&amp; d)<span class="keyword">    const </span>{ Loc tmp=concrete(); tmp+=d;              <span class="keywordflow">return</span> tmp.y(); }</div><div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;    Loc               xy_at(x_coord_t dx, y_coord_t dy)<span class="keyword"> const </span>{ Loc tmp=concrete(); tmp+=<a class="code" href="classboost_1_1gil_1_1point.html">point_t</a>(dx,dy); <span class="keywordflow">return</span> tmp; }</div><div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;    Loc               xy_at(<span class="keyword">const</span> <a class="code" href="classboost_1_1gil_1_1point.html">difference_type</a>&amp; d)<span class="keyword">   const </span>{ Loc tmp=concrete(); tmp+=d;              <span class="keywordflow">return</span> tmp; }</div><div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;</div><div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;    <span class="keyword">template</span> &lt;std::<span class="keywordtype">size_t</span> D&gt; <span class="keyword">typename</span> axis&lt;D&gt;::iterator&amp;       axis_iterator()                       { <span class="keywordflow">return</span> detail::locator_axis&lt;D,Loc&gt;()(concrete()); }</div><div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;    <span class="keyword">template</span> &lt;std::<span class="keywordtype">size_t</span> D&gt; <span class="keyword">typename</span> axis&lt;D&gt;::iterator <span class="keyword">const</span>&amp; axis_iterator()<span class="keyword">                 const </span>{ <span class="keywordflow">return</span> detail::locator_axis&lt;D,Loc&gt;()(concrete()); }</div><div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;    <span class="keyword">template</span> &lt;std::<span class="keywordtype">size_t</span> D&gt; <span class="keyword">typename</span> axis&lt;D&gt;::iterator        axis_iterator(<span class="keyword">const</span> <a class="code" href="classboost_1_1gil_1_1point.html">point_t</a>&amp; p)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> detail::locator_axis&lt;D,Loc&gt;()(concrete(),p); }</div><div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;</div><div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;    reference         operator()(x_coord_t dx, y_coord_t dy)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> *x_at(dx,dy); }</div><div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;    reference         operator[](<span class="keyword">const</span> <a class="code" href="classboost_1_1gil_1_1point.html">difference_type</a>&amp; d)<span class="keyword">   const </span>{ <span class="keywordflow">return</span> *x_at(d.x,d.y); }</div><div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160;</div><div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160;    reference         operator*()<span class="keyword">                            const </span>{ <span class="keywordflow">return</span> *concrete().x(); }</div><div class="line"><a name="l00149"></a><span class="lineno">  149</span>&#160;</div><div class="line"><a name="l00150"></a><span class="lineno">  150</span>&#160;    Loc&amp;              operator+=(<span class="keyword">const</span> <a class="code" href="classboost_1_1gil_1_1point.html">difference_type</a>&amp; d)         { concrete().x()+=d.x; concrete().y()+=d.y; <span class="keywordflow">return</span> concrete(); }</div><div class="line"><a name="l00151"></a><span class="lineno">  151</span>&#160;    Loc&amp;              operator-=(<span class="keyword">const</span> <a class="code" href="classboost_1_1gil_1_1point.html">difference_type</a>&amp; d)         { concrete().x()-=d.x; concrete().y()-=d.y; <span class="keywordflow">return</span> concrete(); }</div><div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;</div><div class="line"><a name="l00153"></a><span class="lineno">  153</span>&#160;    Loc               operator+(<span class="keyword">const</span> <a class="code" href="classboost_1_1gil_1_1point.html">difference_type</a>&amp; d)<span class="keyword">    const </span>{ <span class="keywordflow">return</span> xy_at(d); }</div><div class="line"><a name="l00154"></a><span class="lineno">  154</span>&#160;    Loc               operator-(<span class="keyword">const</span> <a class="code" href="classboost_1_1gil_1_1point.html">difference_type</a>&amp; d)<span class="keyword">    const </span>{ <span class="keywordflow">return</span> xy_at(-d); }</div><div class="line"><a name="l00155"></a><span class="lineno">  155</span>&#160;</div><div class="line"><a name="l00156"></a><span class="lineno">  156</span>&#160;    <span class="comment">// Some locators can cache 2D coordinates for faster subsequent access. By default there is no caching</span></div><div class="line"><a name="l00157"></a><span class="lineno">  157</span>&#160;    <span class="keyword">using</span> <a class="code" href="classboost_1_1gil_1_1point.html">cached_location_t</a> = <a class="code" href="classboost_1_1gil_1_1point.html">difference_type</a>;</div><div class="line"><a name="l00158"></a><span class="lineno">  158</span>&#160;    <a class="code" href="classboost_1_1gil_1_1point.html">cached_location_t</a> cache_location(<span class="keyword">const</span> <a class="code" href="classboost_1_1gil_1_1point.html">difference_type</a>&amp; d)<span class="keyword">  const </span>{ <span class="keywordflow">return</span> d; }</div><div class="line"><a name="l00159"></a><span class="lineno">  159</span>&#160;    <a class="code" href="classboost_1_1gil_1_1point.html">cached_location_t</a> cache_location(x_coord_t dx, y_coord_t dy)<span class="keyword">const </span>{ <span class="keywordflow">return</span> <a class="code" href="classboost_1_1gil_1_1point.html">difference_type</a>(dx,dy); }</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;<span class="keyword">private</span>:</div><div class="line"><a name="l00162"></a><span class="lineno">  162</span>&#160;    Loc&amp;              concrete()       { <span class="keywordflow">return</span> (Loc&amp;)*<span class="keyword">this</span>; }</div><div class="line"><a name="l00163"></a><span class="lineno">  163</span>&#160;    <span class="keyword">const</span> Loc&amp;        concrete()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> (<span class="keyword">const</span> Loc&amp;)*<span class="keyword">this</span>; }</div><div class="line"><a name="l00164"></a><span class="lineno">  164</span>&#160;</div><div class="line"><a name="l00165"></a><span class="lineno">  165</span>&#160;    <span class="keyword">template</span> &lt;<span class="keyword">typename</span> X&gt; <span class="keyword">friend</span> <span class="keyword">class </span>pixel_2d_locator;</div><div class="line"><a name="l00166"></a><span class="lineno">  166</span>&#160;};</div><div class="line"><a name="l00167"></a><span class="lineno">  167</span>&#160;</div><div class="line"><a name="l00168"></a><span class="lineno">  168</span>&#160;<span class="comment">// helper classes for each axis of pixel_2d_locator_base</span></div><div class="line"><a name="l00169"></a><span class="lineno">  169</span>&#160;<span class="keyword">namespace </span>detail {</div><div class="line"><a name="l00170"></a><span class="lineno">  170</span>&#160;    <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Loc&gt;</div><div class="line"><a name="l00171"></a><span class="lineno">  171</span>&#160;    <span class="keyword">class </span>locator_axis&lt;0,Loc&gt; {</div><div class="line"><a name="l00172"></a><span class="lineno">  172</span>&#160;        <span class="keyword">using</span> <a class="code" href="classboost_1_1gil_1_1point.html">point_t</a> = <span class="keyword">typename</span> Loc::point_t;</div><div class="line"><a name="l00173"></a><span class="lineno">  173</span>&#160;    <span class="keyword">public</span>:</div><div class="line"><a name="l00174"></a><span class="lineno">  174</span>&#160;        <span class="keyword">using</span> coord_t = <span class="keyword">typename</span> point_t::template axis&lt;0&gt;::coord_t;</div><div class="line"><a name="l00175"></a><span class="lineno">  175</span>&#160;        <span class="keyword">using</span> iterator = <span class="keyword">typename</span> Loc::x_iterator;</div><div class="line"><a name="l00176"></a><span class="lineno">  176</span>&#160;</div><div class="line"><a name="l00177"></a><span class="lineno">  177</span>&#160;        <span class="keyword">inline</span> iterator&amp;        operator()(      Loc&amp; loc)<span class="keyword">                   const </span>{ <span class="keywordflow">return</span> loc.x(); }</div><div class="line"><a name="l00178"></a><span class="lineno">  178</span>&#160;        <span class="keyword">inline</span> iterator  <span class="keyword">const</span>&amp; operator()(<span class="keyword">const</span> Loc&amp; loc)<span class="keyword">                   const </span>{ <span class="keywordflow">return</span> loc.x(); }</div><div class="line"><a name="l00179"></a><span class="lineno">  179</span>&#160;        <span class="keyword">inline</span> iterator         operator()(      Loc&amp; loc, <span class="keyword">const</span> point_t&amp; d)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> loc.x_at(d); }</div><div class="line"><a name="l00180"></a><span class="lineno">  180</span>&#160;        <span class="keyword">inline</span> iterator         operator()(<span class="keyword">const</span> Loc&amp; loc, <span class="keyword">const</span> point_t&amp; d)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> loc.x_at(d); }</div><div class="line"><a name="l00181"></a><span class="lineno">  181</span>&#160;    };</div><div class="line"><a name="l00182"></a><span class="lineno">  182</span>&#160;</div><div class="line"><a name="l00183"></a><span class="lineno">  183</span>&#160;    <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Loc&gt;</div><div class="line"><a name="l00184"></a><span class="lineno">  184</span>&#160;    <span class="keyword">class </span>locator_axis&lt;1,Loc&gt; {</div><div class="line"><a name="l00185"></a><span class="lineno">  185</span>&#160;        <span class="keyword">using</span> point_t = <span class="keyword">typename</span> Loc::point_t;</div><div class="line"><a name="l00186"></a><span class="lineno">  186</span>&#160;    <span class="keyword">public</span>:</div><div class="line"><a name="l00187"></a><span class="lineno">  187</span>&#160;        <span class="keyword">using</span> coord_t = <span class="keyword">typename</span> point_t::template axis&lt;1&gt;::coord_t;</div><div class="line"><a name="l00188"></a><span class="lineno">  188</span>&#160;        <span class="keyword">using</span> iterator = <span class="keyword">typename</span> Loc::y_iterator;</div><div class="line"><a name="l00189"></a><span class="lineno">  189</span>&#160;</div><div class="line"><a name="l00190"></a><span class="lineno">  190</span>&#160;        <span class="keyword">inline</span> iterator&amp;        operator()(      Loc&amp; loc)<span class="keyword">               const </span>{ <span class="keywordflow">return</span> loc.y(); }</div><div class="line"><a name="l00191"></a><span class="lineno">  191</span>&#160;        <span class="keyword">inline</span> iterator <span class="keyword">const</span>&amp;  operator()(<span class="keyword">const</span> Loc&amp; loc)<span class="keyword">               const </span>{ <span class="keywordflow">return</span> loc.y(); }</div><div class="line"><a name="l00192"></a><span class="lineno">  192</span>&#160;        <span class="keyword">inline</span> iterator     operator()(      Loc&amp; loc, <span class="keyword">const</span> point_t&amp; d)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> loc.y_at(d); }</div><div class="line"><a name="l00193"></a><span class="lineno">  193</span>&#160;        <span class="keyword">inline</span> iterator     operator()(<span class="keyword">const</span> Loc&amp; loc, <span class="keyword">const</span> point_t&amp; d)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> loc.y_at(d); }</div><div class="line"><a name="l00194"></a><span class="lineno">  194</span>&#160;    };</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;</div><div class="line"><a name="l00197"></a><span class="lineno">  197</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Loc, <span class="keyword">typename</span> XIt, <span class="keyword">typename</span> YIt&gt;</div><div class="line"><a name="l00198"></a><span class="lineno">  198</span>&#160;<span class="keyword">struct </span>channel_type&lt;pixel_2d_locator_base&lt;Loc,XIt,YIt&gt; &gt; : <span class="keyword">public</span> channel_type&lt;XIt&gt; {};</div><div class="line"><a name="l00199"></a><span class="lineno">  199</span>&#160;</div><div class="line"><a name="l00200"></a><span class="lineno">  200</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Loc, <span class="keyword">typename</span> XIt, <span class="keyword">typename</span> YIt&gt;</div><div class="line"><a name="l00201"></a><span class="lineno">  201</span>&#160;<span class="keyword">struct </span>color_space_type&lt;pixel_2d_locator_base&lt;Loc,XIt,YIt&gt; &gt; : <span class="keyword">public</span> color_space_type&lt;XIt&gt; {};</div><div class="line"><a name="l00202"></a><span class="lineno">  202</span>&#160;</div><div class="line"><a name="l00203"></a><span class="lineno">  203</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Loc, <span class="keyword">typename</span> XIt, <span class="keyword">typename</span> YIt&gt;</div><div class="line"><a name="l00204"></a><span class="lineno">  204</span>&#160;<span class="keyword">struct </span>channel_mapping_type&lt;pixel_2d_locator_base&lt;Loc,XIt,YIt&gt; &gt; : <span class="keyword">public</span> channel_mapping_type&lt;XIt&gt; {};</div><div class="line"><a name="l00205"></a><span class="lineno">  205</span>&#160;</div><div class="line"><a name="l00206"></a><span class="lineno">  206</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Loc, <span class="keyword">typename</span> XIt, <span class="keyword">typename</span> YIt&gt;</div><div class="line"><a name="l00207"></a><span class="lineno">  207</span>&#160;<span class="keyword">struct </span>is_planar&lt;pixel_2d_locator_base&lt;Loc,XIt,YIt&gt; &gt; : <span class="keyword">public</span> is_planar&lt;XIt&gt; {};</div><div class="line"><a name="l00208"></a><span class="lineno">  208</span>&#160;</div><div class="line"><a name="l00229"></a><span class="lineno">  229</span>&#160;</div><div class="line"><a name="l00230"></a><span class="lineno">  230</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> StepIterator&gt;</div><div class="line"><a name="l00231"></a><span class="lineno">  231</span>&#160;<span class="keyword">class </span>memory_based_2d_locator : <span class="keyword">public</span> pixel_2d_locator_base&lt;memory_based_2d_locator&lt;StepIterator&gt;, typename iterator_adaptor_get_base&lt;StepIterator&gt;::type, StepIterator&gt; {</div><div class="line"><a name="l00232"></a><span class="lineno">  232</span>&#160;    <span class="keyword">using</span> this_t = memory_based_2d_locator&lt;StepIterator&gt;;</div><div class="line"><a name="l00233"></a><span class="lineno">  233</span>&#160;    GIL_CLASS_REQUIRE(StepIterator, boost::gil, StepIteratorConcept)</div><div class="line"><a name="l00234"></a><span class="lineno">  234</span>&#160;<span class="keyword">public</span>:</div><div class="line"><a name="l00235"></a><span class="lineno">  235</span>&#160;    <span class="keyword">using</span> parent_t = pixel_2d_locator_base&lt;memory_based_2d_locator&lt;StepIterator&gt;, <span class="keyword">typename</span> iterator_adaptor_get_base&lt;StepIterator&gt;::type, StepIterator&gt;;</div><div class="line"><a name="l00236"></a><span class="lineno">  236</span>&#160;    <span class="keyword">using</span> const_t = memory_based_2d_locator&lt;typename const_iterator_type&lt;StepIterator&gt;::type&gt;; <span class="comment">// same as this type, but over const values</span></div><div class="line"><a name="l00237"></a><span class="lineno">  237</span>&#160;</div><div class="line"><a name="l00238"></a><span class="lineno">  238</span>&#160;    <span class="keyword">using</span> coord_t = <span class="keyword">typename</span> parent_t::coord_t;</div><div class="line"><a name="l00239"></a><span class="lineno">  239</span>&#160;    <span class="keyword">using</span> x_coord_t = <span class="keyword">typename</span> parent_t::x_coord_t;</div><div class="line"><a name="l00240"></a><span class="lineno">  240</span>&#160;    <span class="keyword">using</span> y_coord_t = <span class="keyword">typename</span> parent_t::y_coord_t;</div><div class="line"><a name="l00241"></a><span class="lineno">  241</span>&#160;    <span class="keyword">using</span> x_iterator = <span class="keyword">typename</span> parent_t::x_iterator;</div><div class="line"><a name="l00242"></a><span class="lineno">  242</span>&#160;    <span class="keyword">using</span> y_iterator = <span class="keyword">typename</span> parent_t::y_iterator;</div><div class="line"><a name="l00243"></a><span class="lineno">  243</span>&#160;    <span class="keyword">using</span> difference_type = <span class="keyword">typename</span> parent_t::difference_type;</div><div class="line"><a name="l00244"></a><span class="lineno">  244</span>&#160;    <span class="keyword">using</span> reference = <span class="keyword">typename</span> parent_t::reference;</div><div class="line"><a name="l00245"></a><span class="lineno">  245</span>&#160;</div><div class="line"><a name="l00246"></a><span class="lineno">  246</span>&#160;    <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Deref&gt; <span class="keyword">struct </span>add_deref</div><div class="line"><a name="l00247"></a><span class="lineno">  247</span>&#160;    {</div><div class="line"><a name="l00248"></a><span class="lineno">  248</span>&#160;        <span class="keyword">using</span> type = memory_based_2d_locator&lt;typename iterator_add_deref&lt;StepIterator,Deref&gt;::type&gt;;</div><div class="line"><a name="l00249"></a><span class="lineno">  249</span>&#160;        <span class="keyword">static</span> type make(<span class="keyword">const</span> memory_based_2d_locator&lt;StepIterator&gt;&amp; loc, <span class="keyword">const</span> Deref&amp; nderef) {</div><div class="line"><a name="l00250"></a><span class="lineno">  250</span>&#160;            <span class="keywordflow">return</span> type(iterator_add_deref&lt;StepIterator,Deref&gt;::make(loc.y(),nderef));</div><div class="line"><a name="l00251"></a><span class="lineno">  251</span>&#160;        }</div><div class="line"><a name="l00252"></a><span class="lineno">  252</span>&#160;    };</div><div class="line"><a name="l00253"></a><span class="lineno">  253</span>&#160;</div><div class="line"><a name="l00254"></a><span class="lineno">  254</span>&#160;    memory_based_2d_locator() {}</div><div class="line"><a name="l00255"></a><span class="lineno">  255</span>&#160;    memory_based_2d_locator(<span class="keyword">const</span> StepIterator&amp; yit) : _p(yit) {}</div><div class="line"><a name="l00256"></a><span class="lineno">  256</span>&#160;    <span class="keyword">template</span> &lt;<span class="keyword">typename</span> SI&gt; memory_based_2d_locator(<span class="keyword">const</span> memory_based_2d_locator&lt;SI&gt;&amp; loc, coord_t y_step) : _p(loc.x(), loc.row_size()*y_step) {}</div><div class="line"><a name="l00257"></a><span class="lineno">  257</span>&#160;    <span class="keyword">template</span> &lt;<span class="keyword">typename</span> SI&gt; memory_based_2d_locator(<span class="keyword">const</span> memory_based_2d_locator&lt;SI&gt;&amp; loc, coord_t x_step, coord_t y_step, <span class="keywordtype">bool</span> transpose=<span class="keyword">false</span>)</div><div class="line"><a name="l00258"></a><span class="lineno">  258</span>&#160;        : _p(make_step_iterator(loc.x(),(transpose ? loc.row_size() : loc.pixel_size())*x_step),</div><div class="line"><a name="l00259"></a><span class="lineno">  259</span>&#160;                                        (transpose ? loc.pixel_size() : loc.row_size())*y_step ) {}</div><div class="line"><a name="l00260"></a><span class="lineno">  260</span>&#160;</div><div class="line"><a name="l00261"></a><span class="lineno">  261</span>&#160;    memory_based_2d_locator(x_iterator xit, std::ptrdiff_t row_bytes) : _p(xit,row_bytes) {}</div><div class="line"><a name="l00262"></a><span class="lineno">  262</span>&#160;    <span class="keyword">template</span> &lt;<span class="keyword">typename</span> X&gt; memory_based_2d_locator(<span class="keyword">const</span> memory_based_2d_locator&lt;X&gt;&amp; pl) : _p(pl._p) {}</div><div class="line"><a name="l00263"></a><span class="lineno">  263</span>&#160;    memory_based_2d_locator(<span class="keyword">const</span> memory_based_2d_locator&amp; pl) : _p(pl._p) {}</div><div class="line"><a name="l00264"></a><span class="lineno">  264</span>&#160;    memory_based_2d_locator&amp; operator=(memory_based_2d_locator <span class="keyword">const</span>&amp; other) = <span class="keywordflow">default</span>;</div><div class="line"><a name="l00265"></a><span class="lineno">  265</span>&#160;</div><div class="line"><a name="l00266"></a><span class="lineno">  266</span>&#160;    <span class="keywordtype">bool</span>                  operator==(<span class="keyword">const</span> this_t&amp; p)<span class="keyword">  const </span>{ <span class="keywordflow">return</span> _p==p._p; }</div><div class="line"><a name="l00267"></a><span class="lineno">  267</span>&#160;</div><div class="line"><a name="l00268"></a><span class="lineno">  268</span>&#160;    x_iterator <span class="keyword">const</span>&amp;     x()<span class="keyword">                          const </span>{ <span class="keywordflow">return</span> _p.base(); }</div><div class="line"><a name="l00269"></a><span class="lineno">  269</span>&#160;    y_iterator <span class="keyword">const</span>&amp;     y()<span class="keyword">                          const </span>{ <span class="keywordflow">return</span> _p; }</div><div class="line"><a name="l00270"></a><span class="lineno">  270</span>&#160;    x_iterator&amp;           x()                                { <span class="keywordflow">return</span> _p.base(); }</div><div class="line"><a name="l00271"></a><span class="lineno">  271</span>&#160;    y_iterator&amp;           y()                                { <span class="keywordflow">return</span> _p; }</div><div class="line"><a name="l00272"></a><span class="lineno">  272</span>&#160;</div><div class="line"><a name="l00273"></a><span class="lineno">  273</span>&#160;    <span class="comment">// These are faster versions of functions already provided in the superclass</span></div><div class="line"><a name="l00274"></a><span class="lineno">  274</span>&#160;    x_iterator x_at      (x_coord_t dx, y_coord_t dy)<span class="keyword">  const </span>{ <span class="keywordflow">return</span> memunit_advanced(x(), offset(dx,dy)); }</div><div class="line"><a name="l00275"></a><span class="lineno">  275</span>&#160;    x_iterator x_at      (<span class="keyword">const</span> difference_type&amp; d)<span class="keyword">    const </span>{ <span class="keywordflow">return</span> memunit_advanced(x(), offset(d.x,d.y)); }</div><div class="line"><a name="l00276"></a><span class="lineno">  276</span>&#160;    this_t     xy_at     (x_coord_t dx, y_coord_t dy)<span class="keyword">  const </span>{ <span class="keywordflow">return</span> this_t(x_at( dx , dy ), row_size()); }</div><div class="line"><a name="l00277"></a><span class="lineno">  277</span>&#160;    this_t     xy_at     (<span class="keyword">const</span> difference_type&amp; d)<span class="keyword">    const </span>{ <span class="keywordflow">return</span> this_t(x_at( d.x, d.y), row_size()); }</div><div class="line"><a name="l00278"></a><span class="lineno">  278</span>&#160;    reference  operator()(x_coord_t dx, y_coord_t dy)<span class="keyword">  const </span>{ <span class="keywordflow">return</span> memunit_advanced_ref(x(),offset(dx,dy)); }</div><div class="line"><a name="l00279"></a><span class="lineno">  279</span>&#160;    reference  operator[](<span class="keyword">const</span> difference_type&amp; d)<span class="keyword">    const </span>{ <span class="keywordflow">return</span> memunit_advanced_ref(x(),offset(d.x,d.y)); }</div><div class="line"><a name="l00280"></a><span class="lineno">  280</span>&#160;    this_t&amp;    operator+=(<span class="keyword">const</span> difference_type&amp; d)          { memunit_advance(x(),offset(d.x,d.y)); <span class="keywordflow">return</span> *<span class="keyword">this</span>; }</div><div class="line"><a name="l00281"></a><span class="lineno">  281</span>&#160;    this_t&amp;    operator-=(<span class="keyword">const</span> difference_type&amp; d)          { memunit_advance(x(),offset(-d.x,-d.y)); <span class="keywordflow">return</span> *<span class="keyword">this</span>; }</div><div class="line"><a name="l00282"></a><span class="lineno">  282</span>&#160;</div><div class="line"><a name="l00283"></a><span class="lineno">  283</span>&#160;    <span class="comment">// Memory-based locators can have 1D caching of 2D relative coordinates</span></div><div class="line"><a name="l00284"></a><span class="lineno">  284</span>&#160;    <span class="keyword">using</span> cached_location_t = std::ptrdiff_t; <span class="comment">// type used to store relative location (to allow for more efficient repeated access)</span></div><div class="line"><a name="l00285"></a><span class="lineno">  285</span>&#160;    cached_location_t cache_location(<span class="keyword">const</span> difference_type&amp; d)<span class="keyword">  const </span>{ <span class="keywordflow">return</span> offset(d.x,d.y); }</div><div class="line"><a name="l00286"></a><span class="lineno">  286</span>&#160;    cached_location_t cache_location(x_coord_t dx, y_coord_t dy)<span class="keyword">const </span>{ <span class="keywordflow">return</span> offset(dx,dy); }</div><div class="line"><a name="l00287"></a><span class="lineno">  287</span>&#160;    reference         operator[](<span class="keyword">const</span> cached_location_t&amp; loc)<span class="keyword">  const </span>{ <span class="keywordflow">return</span> memunit_advanced_ref(x(),loc); }</div><div class="line"><a name="l00288"></a><span class="lineno">  288</span>&#160;</div><div class="line"><a name="l00289"></a><span class="lineno">  289</span>&#160;    <span class="comment">// Only make sense for memory-based locators</span></div><div class="line"><a name="l00290"></a><span class="lineno">  290</span>&#160;    std::ptrdiff_t         row_size()<span class="keyword">                           const </span>{ <span class="keywordflow">return</span> memunit_step(y()); }    <span class="comment">// distance in mem units (bytes or bits) between adjacent rows</span></div><div class="line"><a name="l00291"></a><span class="lineno">  291</span>&#160;    std::ptrdiff_t         pixel_size()<span class="keyword">                         const </span>{ <span class="keywordflow">return</span> memunit_step(x()); }    <span class="comment">// distance in mem units (bytes or bits) between adjacent pixels on the same row</span></div><div class="line"><a name="l00292"></a><span class="lineno">  292</span>&#160;</div><div class="line"><a name="l00293"></a><span class="lineno">  293</span>&#160;    <span class="keywordtype">bool</span>                   is_1d_traversable(x_coord_t width)<span class="keyword">   const </span>{ <span class="keywordflow">return</span> row_size()-pixel_size()*width==0; }   <span class="comment">// is there no gap at the end of each row?</span></div><div class="line"><a name="l00294"></a><span class="lineno">  294</span>&#160;</div><div class="line"><a name="l00295"></a><span class="lineno">  295</span>&#160;    <span class="comment">// Returns the vertical distance (it2.y-it1.y) between two x_iterators given the difference of their x positions</span></div><div class="line"><a name="l00296"></a><span class="lineno">  296</span>&#160;    std::ptrdiff_t y_distance_to(this_t <span class="keyword">const</span>&amp; p2, x_coord_t xDiff)<span class="keyword"> const</span></div><div class="line"><a name="l00297"></a><span class="lineno">  297</span>&#160;<span class="keyword">    </span>{</div><div class="line"><a name="l00298"></a><span class="lineno">  298</span>&#160;        std::ptrdiff_t rowDiff = memunit_distance(x(), p2.x()) - pixel_size() * xDiff;</div><div class="line"><a name="l00299"></a><span class="lineno">  299</span>&#160;        BOOST_ASSERT((rowDiff % row_size()) == 0);</div><div class="line"><a name="l00300"></a><span class="lineno">  300</span>&#160;        <span class="keywordflow">return</span> rowDiff / row_size();</div><div class="line"><a name="l00301"></a><span class="lineno">  301</span>&#160;    }</div><div class="line"><a name="l00302"></a><span class="lineno">  302</span>&#160;</div><div class="line"><a name="l00303"></a><span class="lineno">  303</span>&#160;<span class="keyword">private</span>:</div><div class="line"><a name="l00304"></a><span class="lineno">  304</span>&#160;    <span class="keyword">template</span> &lt;<span class="keyword">typename</span> X&gt; <span class="keyword">friend</span> <span class="keyword">class </span>memory_based_2d_locator;</div><div class="line"><a name="l00305"></a><span class="lineno">  305</span>&#160;    std::ptrdiff_t offset(x_coord_t x, y_coord_t y)<span class="keyword">        const </span>{ <span class="keywordflow">return</span> y*row_size() + x*pixel_size(); }</div><div class="line"><a name="l00306"></a><span class="lineno">  306</span>&#160;    StepIterator _p;</div><div class="line"><a name="l00307"></a><span class="lineno">  307</span>&#160;};</div><div class="line"><a name="l00308"></a><span class="lineno">  308</span>&#160;</div><div class="line"><a name="l00310"></a><span class="lineno">  310</span>&#160;<span class="comment">//  PixelBasedConcept</span></div><div class="line"><a name="l00312"></a><span class="lineno">  312</span>&#160;<span class="comment"></span></div><div class="line"><a name="l00313"></a><span class="lineno">  313</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> SI&gt;</div><div class="line"><a name="l00314"></a><span class="lineno">  314</span>&#160;<span class="keyword">struct </span>color_space_type&lt;memory_based_2d_locator&lt;SI&gt; &gt; : <span class="keyword">public</span> color_space_type&lt;typename memory_based_2d_locator&lt;SI&gt;::parent_t&gt; {</div><div class="line"><a name="l00315"></a><span class="lineno">  315</span>&#160;};</div><div class="line"><a name="l00316"></a><span class="lineno">  316</span>&#160;</div><div class="line"><a name="l00317"></a><span class="lineno">  317</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> SI&gt;</div><div class="line"><a name="l00318"></a><span class="lineno">  318</span>&#160;<span class="keyword">struct </span>channel_mapping_type&lt;memory_based_2d_locator&lt;SI&gt; &gt; : <span class="keyword">public</span> channel_mapping_type&lt;typename memory_based_2d_locator&lt;SI&gt;::parent_t&gt; {</div><div class="line"><a name="l00319"></a><span class="lineno">  319</span>&#160;};</div><div class="line"><a name="l00320"></a><span class="lineno">  320</span>&#160;</div><div class="line"><a name="l00321"></a><span class="lineno">  321</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> SI&gt;</div><div class="line"><a name="l00322"></a><span class="lineno">  322</span>&#160;<span class="keyword">struct </span>is_planar&lt;memory_based_2d_locator&lt;SI&gt; &gt; : <span class="keyword">public</span> is_planar&lt;typename memory_based_2d_locator&lt;SI&gt;::parent_t&gt; {</div><div class="line"><a name="l00323"></a><span class="lineno">  323</span>&#160;};</div><div class="line"><a name="l00324"></a><span class="lineno">  324</span>&#160;</div><div class="line"><a name="l00325"></a><span class="lineno">  325</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> SI&gt;</div><div class="line"><a name="l00326"></a><span class="lineno">  326</span>&#160;<span class="keyword">struct </span>channel_type&lt;memory_based_2d_locator&lt;SI&gt; &gt; : <span class="keyword">public</span> channel_type&lt;typename memory_based_2d_locator&lt;SI&gt;::parent_t&gt; {</div><div class="line"><a name="l00327"></a><span class="lineno">  327</span>&#160;};</div><div class="line"><a name="l00328"></a><span class="lineno">  328</span>&#160;</div><div class="line"><a name="l00330"></a><span class="lineno">  330</span>&#160;<span class="comment">//  HasDynamicXStepTypeConcept</span></div><div class="line"><a name="l00332"></a><span class="lineno">  332</span>&#160;<span class="comment"></span></div><div class="line"><a name="l00333"></a><span class="lineno">  333</span>&#160;<span class="comment">// Take the base iterator of SI (which is typically a step iterator) and change it to have a step in x</span></div><div class="line"><a name="l00334"></a><span class="lineno">  334</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> SI&gt;</div><div class="line"><a name="l00335"></a><span class="lineno">  335</span>&#160;<span class="keyword">struct </span>dynamic_x_step_type&lt;memory_based_2d_locator&lt;SI&gt; &gt; {</div><div class="line"><a name="l00336"></a><span class="lineno">  336</span>&#160;<span class="keyword">private</span>:</div><div class="line"><a name="l00337"></a><span class="lineno">  337</span>&#160;    <span class="keyword">using</span> base_iterator_t = <span class="keyword">typename</span> iterator_adaptor_get_base&lt;SI&gt;::type;</div><div class="line"><a name="l00338"></a><span class="lineno">  338</span>&#160;    <span class="keyword">using</span> base_iterator_step_t = <span class="keyword">typename</span> dynamic_x_step_type&lt;base_iterator_t&gt;::type;</div><div class="line"><a name="l00339"></a><span class="lineno">  339</span>&#160;    <span class="keyword">using</span> dynamic_step_base_t = <span class="keyword">typename</span> iterator_adaptor_rebind&lt;SI, base_iterator_step_t&gt;::type;</div><div class="line"><a name="l00340"></a><span class="lineno">  340</span>&#160;<span class="keyword">public</span>:</div><div class="line"><a name="l00341"></a><span class="lineno">  341</span>&#160;    <span class="keyword">using</span> type = memory_based_2d_locator&lt;dynamic_step_base_t&gt;;</div><div class="line"><a name="l00342"></a><span class="lineno">  342</span>&#160;};</div><div class="line"><a name="l00343"></a><span class="lineno">  343</span>&#160;</div><div class="line"><a name="l00345"></a><span class="lineno">  345</span>&#160;<span class="comment">//  HasDynamicYStepTypeConcept</span></div><div class="line"><a name="l00347"></a><span class="lineno">  347</span>&#160;<span class="comment"></span></div><div class="line"><a name="l00348"></a><span class="lineno">  348</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> SI&gt;</div><div class="line"><a name="l00349"></a><span class="lineno">  349</span>&#160;<span class="keyword">struct </span>dynamic_y_step_type&lt;memory_based_2d_locator&lt;SI&gt; &gt; {</div><div class="line"><a name="l00350"></a><span class="lineno">  350</span>&#160;    <span class="keyword">using</span> type = memory_based_2d_locator&lt;SI&gt;;</div><div class="line"><a name="l00351"></a><span class="lineno">  351</span>&#160;};</div><div class="line"><a name="l00352"></a><span class="lineno">  352</span>&#160;} }  <span class="comment">// namespace boost::gil</span></div><div class="line"><a name="l00353"></a><span class="lineno">  353</span>&#160;</div><div class="line"><a name="l00354"></a><span class="lineno">  354</span>&#160;<span class="preprocessor">#endif</span></div><div class="ttc" id="classboost_1_1gil_1_1pixel__2d__locator__base_html"><div class="ttname"><a href="classboost_1_1gil_1_1pixel__2d__locator__base.html">boost::gil::pixel_2d_locator_base</a></div><div class="ttdoc">base class for models of PixelLocatorConceptPixel locator is similar to a pixel iterator,...</div><div class="ttdef"><b>Definition:</b> locator.hpp:109</div></div>
  51 <div class="ttc" id="structboost_1_1gil_1_1iterator__add__deref_html"><div class="ttname"><a href="structboost_1_1gil_1_1iterator__add__deref.html">boost::gil::iterator_add_deref</a></div><div class="ttdoc">Returns the type (and creates an instance) of an iterator that invokes the given dereference adaptor ...</div><div class="ttdef"><b>Definition:</b> locator.hpp:27</div></div>
  52 <div class="ttc" id="structboost_1_1gil_1_1transposed__type_html"><div class="ttname"><a href="structboost_1_1gil_1_1transposed__type.html">boost::gil::transposed_type</a></div><div class="ttdef"><b>Definition:</b> image_view_factory.hpp:40</div></div>
  53 <div class="ttc" id="structboost_1_1gil_1_1channel__type_html"><div class="ttname"><a href="structboost_1_1gil_1_1channel__type.html">boost::gil::channel_type</a></div><div class="ttdef"><b>Definition:</b> color_convert.hpp:31</div></div>
  54 <div class="ttc" id="structboost_1_1gil_1_1num__channels_html"><div class="ttname"><a href="structboost_1_1gil_1_1num__channels.html">boost::gil::num_channels</a></div><div class="ttdoc">Returns the number of channels of a pixel-based GIL construct.</div><div class="ttdef"><b>Definition:</b> locator.hpp:38</div></div>
  55 <div class="ttc" id="classboost_1_1gil_1_1point_html"><div class="ttname"><a href="classboost_1_1gil_1_1point.html">boost::gil::point</a></div><div class="ttdoc">2D point both axes of which have the same dimension typeModels: Point2DConcept</div><div class="ttdef"><b>Definition:</b> locator.hpp:28</div></div>
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