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  47 <div class="title">step_iterator.hpp</div>  </div>
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<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_STEP_ITERATOR_HPP</span></div><div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="preprocessor">#define BOOST_GIL_STEP_ITERATOR_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/pixel_iterator_adaptor.hpp&gt;</span></div><div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="preprocessor">#include &lt;boost/gil/utilities.hpp&gt;</span></div><div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;</div><div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="preprocessor">#include &lt;boost/iterator/iterator_facade.hpp&gt;</span></div><div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;</div><div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;<span class="preprocessor">#include &lt;cstddef&gt;</span></div><div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;<span class="preprocessor">#include &lt;iterator&gt;</span></div><div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<span class="preprocessor">#include &lt;type_traits&gt;</span></div><div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;</div><div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="keyword">namespace </span>boost { <span class="keyword">namespace </span>gil {</div><div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;</div><div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;</div><div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;<span class="keyword">namespace </span>detail {</div><div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;</div><div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;</div><div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Derived,  <span class="comment">// type of the derived class</span></div><div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;          <span class="keyword">typename</span> Iterator, <span class="comment">// Models Iterator</span></div><div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;          <span class="keyword">typename</span> SFn&gt;      <span class="comment">// A policy object that can compute the distance between two iterators of type Iterator</span></div><div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;                             <span class="comment">// and can advance an iterator of type Iterator a given number of Iterator&#39;s units</span></div><div class="line"><a name="l00041"></a><span class="lineno"><a class="line" href="classboost_1_1gil_1_1detail_1_1step__iterator__adaptor.html">   41</a></span>&#160;<span class="keyword">class </span><a class="code" href="classboost_1_1gil_1_1detail_1_1step__iterator__adaptor.html">step_iterator_adaptor</a> : <span class="keyword">public</span> iterator_adaptor&lt;Derived, Iterator, use_default, use_default, use_default, typename SFn::difference_type&gt;</div><div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;{</div><div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;<span class="keyword">public</span>:</div><div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;    <span class="keyword">using</span> parent_t = iterator_adaptor&lt;Derived, Iterator, use_default, use_default, use_default, typename SFn::difference_type&gt;;</div><div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;    <span class="keyword">using</span> base_difference_type = <span class="keyword">typename</span> std::iterator_traits&lt;Iterator&gt;::difference_type;</div><div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;    <span class="keyword">using</span> difference_type = <span class="keyword">typename</span> SFn::difference_type;</div><div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;    <span class="keyword">using</span> reference = <span class="keyword">typename</span> std::iterator_traits&lt;Iterator&gt;::reference;</div><div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;</div><div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;    <a class="code" href="classboost_1_1gil_1_1detail_1_1step__iterator__adaptor.html">step_iterator_adaptor</a>() {}</div><div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;    <a class="code" href="classboost_1_1gil_1_1detail_1_1step__iterator__adaptor.html">step_iterator_adaptor</a>(<span class="keyword">const</span> Iterator&amp; it, SFn step_fn=SFn()) : parent_t(it), _step_fn(step_fn) {}</div><div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;</div><div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;    difference_type step()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> _step_fn.step(); }</div><div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;</div><div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;<span class="keyword">protected</span>:</div><div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;    SFn _step_fn;</div><div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;<span class="keyword">private</span>:</div><div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;    <span class="keyword">friend</span> <span class="keyword">class </span>boost::iterator_core_access;</div><div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;</div><div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;    <span class="keywordtype">void</span> increment() { _step_fn.advance(this-&gt;base_reference(),1); }</div><div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;    <span class="keywordtype">void</span> decrement() { _step_fn.advance(this-&gt;base_reference(),-1); }</div><div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;    <span class="keywordtype">void</span> advance(base_difference_type d) { _step_fn.advance(this-&gt;base_reference(),d); }</div><div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;    difference_type distance_to(<span class="keyword">const</span> <a class="code" href="classboost_1_1gil_1_1detail_1_1step__iterator__adaptor.html">step_iterator_adaptor</a>&amp; it)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> _step_fn.difference(this-&gt;base_reference(),it.base_reference()); }</div><div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;};</div><div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;</div><div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;<span class="comment">// although iterator_adaptor defines these, the default implementation computes distance and compares for zero.</span></div><div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;<span class="comment">// it is often faster to just apply the relation operator to the base</span></div><div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> D,<span class="keyword">typename</span> Iterator,<span class="keyword">typename</span> SFn&gt; <span class="keyword">inline</span></div><div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;<span class="keywordtype">bool</span> operator&gt;(<span class="keyword">const</span> <a class="code" href="classboost_1_1gil_1_1detail_1_1step__iterator__adaptor.html">step_iterator_adaptor&lt;D,Iterator,SFn&gt;</a>&amp; p1, <span class="keyword">const</span> <a class="code" href="classboost_1_1gil_1_1detail_1_1step__iterator__adaptor.html">step_iterator_adaptor&lt;D,Iterator,SFn&gt;</a>&amp; p2) {</div><div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;    <span class="keywordflow">return</span> p1.step()&gt;0 ? p1.base()&gt; p2.base() : p1.base()&lt; p2.base();</div><div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;}</div><div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;</div><div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> D,<span class="keyword">typename</span> Iterator,<span class="keyword">typename</span> SFn&gt; <span class="keyword">inline</span></div><div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;<span class="keywordtype">bool</span> operator&lt;(<span class="keyword">const</span> step_iterator_adaptor&lt;D,Iterator,SFn&gt;&amp; p1, <span class="keyword">const</span> step_iterator_adaptor&lt;D,Iterator,SFn&gt;&amp; p2) {</div><div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;    <span class="keywordflow">return</span> p1.step()&gt;0 ? p1.base()&lt; p2.base() : p1.base()&gt; p2.base();</div><div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;}</div><div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;</div><div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> D,<span class="keyword">typename</span> Iterator,<span class="keyword">typename</span> SFn&gt; <span class="keyword">inline</span></div><div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;<span class="keywordtype">bool</span> operator&gt;=(<span class="keyword">const</span> step_iterator_adaptor&lt;D,Iterator,SFn&gt;&amp; p1, <span class="keyword">const</span> step_iterator_adaptor&lt;D,Iterator,SFn&gt;&amp; p2) {</div><div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;    <span class="keywordflow">return</span> p1.step()&gt;0 ? p1.base()&gt;=p2.base() : p1.base()&lt;=p2.base();</div><div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;}</div><div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;</div><div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> D,<span class="keyword">typename</span> Iterator,<span class="keyword">typename</span> SFn&gt; <span class="keyword">inline</span></div><div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;<span class="keywordtype">bool</span> operator&lt;=(<span class="keyword">const</span> step_iterator_adaptor&lt;D,Iterator,SFn&gt;&amp; p1, <span class="keyword">const</span> step_iterator_adaptor&lt;D,Iterator,SFn&gt;&amp; p2) {</div><div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;    <span class="keywordflow">return</span> p1.step()&gt;0 ? p1.base()&lt;=p2.base() : p1.base()&gt;=p2.base();</div><div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;}</div><div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;</div><div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> D,<span class="keyword">typename</span> Iterator,<span class="keyword">typename</span> SFn&gt; <span class="keyword">inline</span></div><div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;<span class="keywordtype">bool</span> operator==(<span class="keyword">const</span> step_iterator_adaptor&lt;D,Iterator,SFn&gt;&amp; p1, <span class="keyword">const</span> step_iterator_adaptor&lt;D,Iterator,SFn&gt;&amp; p2) {</div><div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;    <span class="keywordflow">return</span> p1.base()==p2.base();</div><div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;}</div><div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;</div><div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> D,<span class="keyword">typename</span> Iterator,<span class="keyword">typename</span> SFn&gt; <span class="keyword">inline</span></div><div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;<span class="keywordtype">bool</span> operator!=(<span class="keyword">const</span> step_iterator_adaptor&lt;D,Iterator,SFn&gt;&amp; p1, <span class="keyword">const</span> step_iterator_adaptor&lt;D,Iterator,SFn&gt;&amp; p2) {</div><div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;    <span class="keywordflow">return</span> p1.base()!=p2.base();</div><div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;}</div><div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;</div><div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;} <span class="comment">// namespace detail</span></div><div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;</div><div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;</div><div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;</div><div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Iterator&gt;</div><div class="line"><a name="l00122"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1memunit__step__fn.html">  122</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structboost_1_1gil_1_1memunit__step__fn.html">memunit_step_fn</a> {</div><div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;    <span class="keyword">using</span> difference_type = std::ptrdiff_t;</div><div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;</div><div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;    <a class="code" href="structboost_1_1gil_1_1memunit__step__fn.html">memunit_step_fn</a>(difference_type step=memunit_step(Iterator())) : _step(step) {}</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;    difference_type difference(<span class="keyword">const</span> Iterator&amp; it1, <span class="keyword">const</span> Iterator&amp; it2)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> memunit_distance(it1,it2)/_step; }</div><div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;    <span class="keywordtype">void</span>            advance(Iterator&amp; it, difference_type d)<span class="keyword">             const </span>{ memunit_advance(it,d*_step); }</div><div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;    difference_type step()<span class="keyword">                                               const </span>{ <span class="keywordflow">return</span> _step; }</div><div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;</div><div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;    <span class="keywordtype">void</span>            set_step(std::ptrdiff_t step) { _step=step; }</div><div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;<span class="keyword">private</span>:</div><div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;    GIL_CLASS_REQUIRE(Iterator, boost::gil, <a class="code" href="structboost_1_1gil_1_1_memory_based_iterator_concept.html">MemoryBasedIteratorConcept</a>)</div><div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;    difference_type _step;</div><div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;};</div><div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;</div><div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Iterator&gt;</div><div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;<span class="keyword">class </span><a class="code" href="classboost_1_1gil_1_1memory__based__step__iterator.html">memory_based_step_iterator</a> : <span class="keyword">public</span> <a class="code" href="classboost_1_1gil_1_1detail_1_1step__iterator__adaptor.html">detail::step_iterator_adaptor</a>&lt;memory_based_step_iterator&lt;Iterator&gt;,</div><div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;                                                                            Iterator,</div><div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;                                                                            memunit_step_fn&lt;Iterator&gt;&gt;</div><div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;{</div><div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;    GIL_CLASS_REQUIRE(Iterator, boost::gil, <a class="code" href="structboost_1_1gil_1_1_memory_based_iterator_concept.html">MemoryBasedIteratorConcept</a>)</div><div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;<span class="keyword">public</span>:</div><div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;    <span class="keyword">using</span> parent_t = <a class="code" href="classboost_1_1gil_1_1detail_1_1step__iterator__adaptor.html">detail::step_iterator_adaptor&lt;memory_based_step_iterator&lt;Iterator&gt;</a>,</div><div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;                                          Iterator,</div><div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;                                          <a class="code" href="structboost_1_1gil_1_1memunit__step__fn.html">memunit_step_fn&lt;Iterator&gt;</a>&gt;;</div><div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160;    <span class="keyword">using</span> reference = <span class="keyword">typename</span> parent_t::reference;</div><div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160;    <span class="keyword">using</span> difference_type = <span class="keyword">typename</span> parent_t::difference_type;</div><div class="line"><a name="l00149"></a><span class="lineno">  149</span>&#160;    <span class="keyword">using</span> x_iterator = Iterator;</div><div class="line"><a name="l00150"></a><span class="lineno">  150</span>&#160;</div><div class="line"><a name="l00151"></a><span class="lineno">  151</span>&#160;    <a class="code" href="classboost_1_1gil_1_1memory__based__step__iterator.html">memory_based_step_iterator</a>() : parent_t(Iterator()) {}</div><div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;    memory_based_step_iterator(Iterator it, std::ptrdiff_t memunit_step) : parent_t(it, memunit_step_fn&lt;Iterator&gt;(memunit_step)) {}</div><div class="line"><a name="l00153"></a><span class="lineno">  153</span>&#160;    <span class="keyword">template</span> &lt;<span class="keyword">typename</span> I2&gt;</div><div class="line"><a name="l00154"></a><span class="lineno">  154</span>&#160;    memory_based_step_iterator(<span class="keyword">const</span> memory_based_step_iterator&lt;I2&gt;&amp; it)</div><div class="line"><a name="l00155"></a><span class="lineno">  155</span>&#160;        : parent_t(it.base(), memunit_step_fn&lt;Iterator&gt;(it.step())) {}</div><div class="line"><a name="l00156"></a><span class="lineno">  156</span>&#160;</div><div class="line"><a name="l00159"></a><span class="lineno"><a class="line" href="classboost_1_1gil_1_1memory__based__step__iterator.html#a16d8e6857dd561244ca73764f2b94801">  159</a></span>&#160;    reference <a class="code" href="classboost_1_1gil_1_1memory__based__step__iterator.html#a16d8e6857dd561244ca73764f2b94801">operator[]</a>(difference_type d)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> *(*<span class="keyword">this</span>+d); }</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="keywordtype">void</span> set_step(std::ptrdiff_t memunit_step) { this-&gt;_step_fn.set_step(memunit_step); }</div><div class="line"><a name="l00162"></a><span class="lineno">  162</span>&#160;</div><div class="line"><a name="l00163"></a><span class="lineno">  163</span>&#160;    x_iterator&amp; base()              { <span class="keywordflow">return</span> parent_t::base_reference(); }</div><div class="line"><a name="l00164"></a><span class="lineno">  164</span>&#160;    x_iterator <span class="keyword">const</span>&amp; base()<span class="keyword"> const  </span>{ <span class="keywordflow">return</span> parent_t::base_reference(); }</div><div class="line"><a name="l00165"></a><span class="lineno">  165</span>&#160;};</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;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Iterator&gt;</div><div class="line"><a name="l00168"></a><span class="lineno">  168</span>&#160;<span class="keyword">struct </span>const_iterator_type&lt;memory_based_step_iterator&lt;Iterator&gt;&gt; {</div><div class="line"><a name="l00169"></a><span class="lineno">  169</span>&#160;    <span class="keyword">using</span> type = memory_based_step_iterator&lt;typename const_iterator_type&lt;Iterator&gt;::type&gt;;</div><div class="line"><a name="l00170"></a><span class="lineno">  170</span>&#160;};</div><div class="line"><a name="l00171"></a><span class="lineno">  171</span>&#160;</div><div class="line"><a name="l00172"></a><span class="lineno">  172</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Iterator&gt;</div><div class="line"><a name="l00173"></a><span class="lineno">  173</span>&#160;<span class="keyword">struct </span>iterator_is_mutable&lt;memory_based_step_iterator&lt;Iterator&gt;&gt; : <span class="keyword">public</span> iterator_is_mutable&lt;Iterator&gt; {};</div><div class="line"><a name="l00174"></a><span class="lineno">  174</span>&#160;</div><div class="line"><a name="l00175"></a><span class="lineno">  175</span>&#160;</div><div class="line"><a name="l00177"></a><span class="lineno">  177</span>&#160;<span class="comment">//  IteratorAdaptorConcept</span></div><div class="line"><a name="l00179"></a><span class="lineno">  179</span>&#160;<span class="comment"></span></div><div class="line"><a name="l00180"></a><span class="lineno">  180</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Iterator&gt;</div><div class="line"><a name="l00181"></a><span class="lineno">  181</span>&#160;<span class="keyword">struct </span>is_iterator_adaptor&lt;memory_based_step_iterator&lt;Iterator&gt;&gt; : std::true_type {};</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> Iterator&gt;</div><div class="line"><a name="l00184"></a><span class="lineno">  184</span>&#160;<span class="keyword">struct </span>iterator_adaptor_get_base&lt;memory_based_step_iterator&lt;Iterator&gt;&gt;</div><div class="line"><a name="l00185"></a><span class="lineno">  185</span>&#160;{</div><div class="line"><a name="l00186"></a><span class="lineno">  186</span>&#160;    <span class="keyword">using</span> type = Iterator;</div><div class="line"><a name="l00187"></a><span class="lineno">  187</span>&#160;};</div><div class="line"><a name="l00188"></a><span class="lineno">  188</span>&#160;</div><div class="line"><a name="l00189"></a><span class="lineno">  189</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Iterator, <span class="keyword">typename</span> NewBaseIterator&gt;</div><div class="line"><a name="l00190"></a><span class="lineno">  190</span>&#160;<span class="keyword">struct </span>iterator_adaptor_rebind&lt;memory_based_step_iterator&lt;Iterator&gt;, NewBaseIterator&gt;</div><div class="line"><a name="l00191"></a><span class="lineno">  191</span>&#160;{</div><div class="line"><a name="l00192"></a><span class="lineno">  192</span>&#160;    <span class="keyword">using</span> type = memory_based_step_iterator&lt;NewBaseIterator&gt;;</div><div class="line"><a name="l00193"></a><span class="lineno">  193</span>&#160;};</div><div class="line"><a name="l00194"></a><span class="lineno">  194</span>&#160;</div><div class="line"><a name="l00196"></a><span class="lineno">  196</span>&#160;<span class="comment">//  PixelBasedConcept</span></div><div class="line"><a name="l00198"></a><span class="lineno">  198</span>&#160;<span class="comment"></span></div><div class="line"><a name="l00199"></a><span class="lineno">  199</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Iterator&gt;</div><div class="line"><a name="l00200"></a><span class="lineno">  200</span>&#160;<span class="keyword">struct </span>color_space_type&lt;memory_based_step_iterator&lt;Iterator&gt;&gt; : <span class="keyword">public</span> color_space_type&lt;Iterator&gt; {};</div><div class="line"><a name="l00201"></a><span class="lineno">  201</span>&#160;</div><div class="line"><a name="l00202"></a><span class="lineno">  202</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Iterator&gt;</div><div class="line"><a name="l00203"></a><span class="lineno">  203</span>&#160;<span class="keyword">struct </span>channel_mapping_type&lt;memory_based_step_iterator&lt;Iterator&gt;&gt; : <span class="keyword">public</span> channel_mapping_type&lt;Iterator&gt; {};</div><div class="line"><a name="l00204"></a><span class="lineno">  204</span>&#160;</div><div class="line"><a name="l00205"></a><span class="lineno">  205</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Iterator&gt;</div><div class="line"><a name="l00206"></a><span class="lineno">  206</span>&#160;<span class="keyword">struct </span>is_planar&lt;memory_based_step_iterator&lt;Iterator&gt;&gt; : <span class="keyword">public</span> is_planar&lt;Iterator&gt; {};</div><div class="line"><a name="l00207"></a><span class="lineno">  207</span>&#160;</div><div class="line"><a name="l00208"></a><span class="lineno">  208</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Iterator&gt;</div><div class="line"><a name="l00209"></a><span class="lineno">  209</span>&#160;<span class="keyword">struct </span>channel_type&lt;memory_based_step_iterator&lt;Iterator&gt;&gt; : <span class="keyword">public</span> channel_type&lt;Iterator&gt; {};</div><div class="line"><a name="l00210"></a><span class="lineno">  210</span>&#160;</div><div class="line"><a name="l00212"></a><span class="lineno">  212</span>&#160;<span class="comment">//  MemoryBasedIteratorConcept</span></div><div class="line"><a name="l00214"></a><span class="lineno">  214</span>&#160;<span class="comment"></span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> Iterator&gt;</div><div class="line"><a name="l00215"></a><span class="lineno">  215</span>&#160;<span class="keyword">struct </span>byte_to_memunit&lt;memory_based_step_iterator&lt;Iterator&gt;&gt; : <span class="keyword">public</span> byte_to_memunit&lt;Iterator&gt; {};</div><div class="line"><a name="l00216"></a><span class="lineno">  216</span>&#160;</div><div class="line"><a name="l00217"></a><span class="lineno">  217</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Iterator&gt;</div><div class="line"><a name="l00218"></a><span class="lineno">  218</span>&#160;<span class="keyword">inline</span> std::ptrdiff_t memunit_step(<span class="keyword">const</span> memory_based_step_iterator&lt;Iterator&gt;&amp; p) { <span class="keywordflow">return</span> p.step(); }</div><div class="line"><a name="l00219"></a><span class="lineno">  219</span>&#160;</div><div class="line"><a name="l00220"></a><span class="lineno">  220</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Iterator&gt;</div><div class="line"><a name="l00221"></a><span class="lineno">  221</span>&#160;<span class="keyword">inline</span> std::ptrdiff_t memunit_distance(<span class="keyword">const</span> memory_based_step_iterator&lt;Iterator&gt;&amp; p1,</div><div class="line"><a name="l00222"></a><span class="lineno">  222</span>&#160;                                    <span class="keyword">const</span> memory_based_step_iterator&lt;Iterator&gt;&amp; p2) {</div><div class="line"><a name="l00223"></a><span class="lineno">  223</span>&#160;    <span class="keywordflow">return</span> memunit_distance(p1.base(),p2.base());</div><div class="line"><a name="l00224"></a><span class="lineno">  224</span>&#160;}</div><div class="line"><a name="l00225"></a><span class="lineno">  225</span>&#160;</div><div class="line"><a name="l00226"></a><span class="lineno">  226</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Iterator&gt;</div><div class="line"><a name="l00227"></a><span class="lineno">  227</span>&#160;<span class="keyword">inline</span> <span class="keywordtype">void</span> memunit_advance(memory_based_step_iterator&lt;Iterator&gt;&amp; p,</div><div class="line"><a name="l00228"></a><span class="lineno">  228</span>&#160;                         std::ptrdiff_t diff) {</div><div class="line"><a name="l00229"></a><span class="lineno">  229</span>&#160;    memunit_advance(p.base(), diff);</div><div class="line"><a name="l00230"></a><span class="lineno">  230</span>&#160;}</div><div class="line"><a name="l00231"></a><span class="lineno">  231</span>&#160;</div><div class="line"><a name="l00232"></a><span class="lineno">  232</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Iterator&gt;</div><div class="line"><a name="l00233"></a><span class="lineno">  233</span>&#160;<span class="keyword">inline</span> memory_based_step_iterator&lt;Iterator&gt;</div><div class="line"><a name="l00234"></a><span class="lineno">  234</span>&#160;memunit_advanced(<span class="keyword">const</span> memory_based_step_iterator&lt;Iterator&gt;&amp; p,</div><div class="line"><a name="l00235"></a><span class="lineno">  235</span>&#160;              std::ptrdiff_t diff) {</div><div class="line"><a name="l00236"></a><span class="lineno">  236</span>&#160;    <span class="keywordflow">return</span> memory_based_step_iterator&lt;Iterator&gt;(memunit_advanced(p.base(), diff),p.step());</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;</div><div class="line"><a name="l00239"></a><span class="lineno">  239</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Iterator&gt;</div><div class="line"><a name="l00240"></a><span class="lineno">  240</span>&#160;<span class="keyword">inline</span> <span class="keyword">typename</span> std::iterator_traits&lt;Iterator&gt;::reference</div><div class="line"><a name="l00241"></a><span class="lineno">  241</span>&#160;memunit_advanced_ref(<span class="keyword">const</span> memory_based_step_iterator&lt;Iterator&gt;&amp; p,</div><div class="line"><a name="l00242"></a><span class="lineno">  242</span>&#160;                  std::ptrdiff_t diff) {</div><div class="line"><a name="l00243"></a><span class="lineno">  243</span>&#160;    <span class="keywordflow">return</span> memunit_advanced_ref(p.base(), diff);</div><div class="line"><a name="l00244"></a><span class="lineno">  244</span>&#160;}</div><div class="line"><a name="l00245"></a><span class="lineno">  245</span>&#160;</div><div class="line"><a name="l00247"></a><span class="lineno">  247</span>&#160;<span class="comment">//  HasDynamicXStepTypeConcept</span></div><div class="line"><a name="l00249"></a><span class="lineno">  249</span>&#160;<span class="comment"></span></div><div class="line"><a name="l00250"></a><span class="lineno">  250</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Iterator&gt;</div><div class="line"><a name="l00251"></a><span class="lineno">  251</span>&#160;<span class="keyword">struct </span>dynamic_x_step_type&lt;memory_based_step_iterator&lt;Iterator&gt;&gt; {</div><div class="line"><a name="l00252"></a><span class="lineno">  252</span>&#160;    <span class="keyword">using</span> type = memory_based_step_iterator&lt;Iterator&gt;;</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;</div><div class="line"><a name="l00255"></a><span class="lineno">  255</span>&#160;<span class="comment">// For step iterators, pass the function object to the base</span></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> Iterator, <span class="keyword">typename</span> Deref&gt;</div><div class="line"><a name="l00257"></a><span class="lineno">  257</span>&#160;<span class="keyword">struct </span>iterator_add_deref&lt;memory_based_step_iterator&lt;Iterator&gt;,Deref&gt; {</div><div class="line"><a name="l00258"></a><span class="lineno">  258</span>&#160;    GIL_CLASS_REQUIRE(Deref, boost::gil, PixelDereferenceAdaptorConcept)</div><div class="line"><a name="l00259"></a><span class="lineno">  259</span>&#160;</div><div class="line"><a name="l00260"></a><span class="lineno">  260</span>&#160;    <span class="keyword">using</span> type = memory_based_step_iterator&lt;typename iterator_add_deref&lt;Iterator, Deref&gt;::type&gt;;</div><div class="line"><a name="l00261"></a><span class="lineno">  261</span>&#160;</div><div class="line"><a name="l00262"></a><span class="lineno">  262</span>&#160;    <span class="keyword">static</span> type make(<span class="keyword">const</span> memory_based_step_iterator&lt;Iterator&gt;&amp; it, <span class="keyword">const</span> Deref&amp; d) { <span class="keywordflow">return</span> type(iterator_add_deref&lt;Iterator, Deref&gt;::make(it.base(),d),it.step()); }</div><div class="line"><a name="l00263"></a><span class="lineno">  263</span>&#160;};</div><div class="line"><a name="l00264"></a><span class="lineno">  264</span>&#160;</div><div class="line"><a name="l00268"></a><span class="lineno">  268</span>&#160;</div><div class="line"><a name="l00269"></a><span class="lineno">  269</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> I&gt; <span class="keyword">typename</span> dynamic_x_step_type&lt;I&gt;::type make_step_iterator(<span class="keyword">const</span> I&amp; it, std::ptrdiff_t step);</div><div class="line"><a name="l00270"></a><span class="lineno">  270</span>&#160;</div><div class="line"><a name="l00271"></a><span class="lineno">  271</span>&#160;<span class="keyword">namespace </span>detail {</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">// if the iterator is a plain base iterator (non-adaptor), wraps it in memory_based_step_iterator</span></div><div class="line"><a name="l00274"></a><span class="lineno">  274</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> I&gt;</div><div class="line"><a name="l00275"></a><span class="lineno">  275</span>&#160;<span class="keyword">auto</span> make_step_iterator_impl(I <span class="keyword">const</span>&amp; it, std::ptrdiff_t step, std::false_type)</div><div class="line"><a name="l00276"></a><span class="lineno">  276</span>&#160;    -&gt; <span class="keyword">typename</span> dynamic_x_step_type&lt;I&gt;::type</div><div class="line"><a name="l00277"></a><span class="lineno">  277</span>&#160;{</div><div class="line"><a name="l00278"></a><span class="lineno">  278</span>&#160;    <span class="keywordflow">return</span> memory_based_step_iterator&lt;I&gt;(it, step);</div><div class="line"><a name="l00279"></a><span class="lineno">  279</span>&#160;}</div><div class="line"><a name="l00280"></a><span class="lineno">  280</span>&#160;</div><div class="line"><a name="l00281"></a><span class="lineno">  281</span>&#160;<span class="comment">// If the iterator is compound, put the step in its base</span></div><div class="line"><a name="l00282"></a><span class="lineno">  282</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> I&gt;</div><div class="line"><a name="l00283"></a><span class="lineno">  283</span>&#160;<span class="keyword">auto</span> make_step_iterator_impl(I <span class="keyword">const</span>&amp; it, std::ptrdiff_t step, std::true_type)</div><div class="line"><a name="l00284"></a><span class="lineno">  284</span>&#160;    -&gt; <span class="keyword">typename</span> dynamic_x_step_type&lt;I&gt;::type</div><div class="line"><a name="l00285"></a><span class="lineno">  285</span>&#160;{</div><div class="line"><a name="l00286"></a><span class="lineno">  286</span>&#160;    <span class="keywordflow">return</span> make_step_iterator(it.base(), step);</div><div class="line"><a name="l00287"></a><span class="lineno">  287</span>&#160;}</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">// If the iterator is memory_based_step_iterator, change the step</span></div><div class="line"><a name="l00290"></a><span class="lineno">  290</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> BaseIt&gt;</div><div class="line"><a name="l00291"></a><span class="lineno">  291</span>&#160;<span class="keyword">auto</span> make_step_iterator_impl(</div><div class="line"><a name="l00292"></a><span class="lineno">  292</span>&#160;    memory_based_step_iterator&lt;BaseIt&gt; <span class="keyword">const</span>&amp; it,</div><div class="line"><a name="l00293"></a><span class="lineno">  293</span>&#160;    std::ptrdiff_t step,</div><div class="line"><a name="l00294"></a><span class="lineno">  294</span>&#160;    std::true_type)</div><div class="line"><a name="l00295"></a><span class="lineno">  295</span>&#160;    -&gt; memory_based_step_iterator&lt;BaseIt&gt;</div><div class="line"><a name="l00296"></a><span class="lineno">  296</span>&#160;{</div><div class="line"><a name="l00297"></a><span class="lineno">  297</span>&#160;    <span class="keywordflow">return</span> memory_based_step_iterator&lt;BaseIt&gt;(it.base(), step);</div><div class="line"><a name="l00298"></a><span class="lineno">  298</span>&#160;}</div><div class="line"><a name="l00299"></a><span class="lineno">  299</span>&#160;</div><div class="line"><a name="l00300"></a><span class="lineno">  300</span>&#160;} <span class="comment">// namespace detail</span></div><div class="line"><a name="l00301"></a><span class="lineno">  301</span>&#160;</div><div class="line"><a name="l00315"></a><span class="lineno">  315</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> I&gt;  <span class="comment">// Models MemoryBasedIteratorConcept, HasDynamicXStepTypeConcept</span></div><div class="line"><a name="l00316"></a><span class="lineno">  316</span>&#160;<span class="keyword">typename</span> dynamic_x_step_type&lt;I&gt;::type make_step_iterator(<span class="keyword">const</span> I&amp; it, std::ptrdiff_t step) {</div><div class="line"><a name="l00317"></a><span class="lineno">  317</span>&#160;    <span class="keywordflow">return</span> detail::make_step_iterator_impl(it, step, <span class="keyword">typename</span> is_iterator_adaptor&lt;I&gt;::type());</div><div class="line"><a name="l00318"></a><span class="lineno">  318</span>&#160;}</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;}}  <span class="comment">// namespace boost::gil</span></div><div class="line"><a name="l00321"></a><span class="lineno">  321</span>&#160;</div><div class="line"><a name="l00322"></a><span class="lineno">  322</span>&#160;<span class="preprocessor">#endif</span></div><div class="ttc" id="structboost_1_1gil_1_1_memory_based_iterator_concept_html"><div class="ttname"><a href="structboost_1_1gil_1_1_memory_based_iterator_concept.html">boost::gil::MemoryBasedIteratorConcept</a></div><div class="ttdoc">Concept of a random-access iterator that can be advanced in memory units (bytes or bits)</div><div class="ttdef"><b>Definition:</b> concepts/pixel_iterator.hpp:235</div></div>
  51 <div class="ttc" id="classboost_1_1gil_1_1memory__based__step__iterator_html_a16d8e6857dd561244ca73764f2b94801"><div class="ttname"><a href="classboost_1_1gil_1_1memory__based__step__iterator.html#a16d8e6857dd561244ca73764f2b94801">boost::gil::memory_based_step_iterator::operator[]</a></div><div class="ttdeci">reference operator[](difference_type d) const</div><div class="ttdef"><b>Definition:</b> step_iterator.hpp:159</div></div>
  52 <div class="ttc" id="structboost_1_1gil_1_1memunit__step__fn_html"><div class="ttname"><a href="structboost_1_1gil_1_1memunit__step__fn.html">boost::gil::memunit_step_fn</a></div><div class="ttdoc">function object that returns the memory unit distance between two iterators and advances a given iter...</div><div class="ttdef"><b>Definition:</b> step_iterator.hpp:122</div></div>
  53 <div class="ttc" id="classboost_1_1gil_1_1detail_1_1step__iterator__adaptor_html"><div class="ttname"><a href="classboost_1_1gil_1_1detail_1_1step__iterator__adaptor.html">boost::gil::detail::step_iterator_adaptor</a></div><div class="ttdoc">An adaptor over an existing iterator that changes the step unit.</div><div class="ttdef"><b>Definition:</b> step_iterator.hpp:41</div></div>
  54 <div class="ttc" id="classboost_1_1gil_1_1memory__based__step__iterator_html"><div class="ttname"><a href="classboost_1_1gil_1_1memory__based__step__iterator.html">boost::gil::memory_based_step_iterator</a></div><div class="ttdoc">MEMORY-BASED STEP ITERATOR.</div><div class="ttdef"><b>Definition:</b> algorithm.hpp:36</div></div>
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