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- <div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">//</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">// Copyright 2005-2007 Adobe Systems Incorporated</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">//</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <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> <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> <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> <span class="comment">//</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="preprocessor">#ifndef BOOST_GIL_STEP_ITERATOR_HPP</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#define BOOST_GIL_STEP_ITERATOR_HPP</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> </div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#include <boost/gil/dynamic_step.hpp></span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#include <boost/gil/pixel_iterator.hpp></span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#include <boost/gil/pixel_iterator_adaptor.hpp></span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#include <boost/gil/utilities.hpp></span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> </div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#include <boost/iterator/iterator_facade.hpp></span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> </div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="preprocessor">#include <cstddef></span></div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="preprocessor">#include <iterator></span></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor">#include <type_traits></span></div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> </div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <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> </div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> </div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="keyword">namespace </span>detail {</div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> </div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> </div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="keyword">template</span> <<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>  <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>  <span class="keyword">typename</span> SFn> <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>  <span class="comment">// and can advance an iterator of type Iterator a given number of Iterator'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> <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<Derived, Iterator, use_default, use_default, use_default, typename SFn::difference_type></div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> {</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="keyword">public</span>:</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="keyword">using</span> parent_t = iterator_adaptor<Derived, Iterator, use_default, use_default, use_default, typename SFn::difference_type>;</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="keyword">using</span> base_difference_type = <span class="keyword">typename</span> std::iterator_traits<Iterator>::difference_type;</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <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>  <span class="keyword">using</span> reference = <span class="keyword">typename</span> std::iterator_traits<Iterator>::reference;</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> </div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <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>  <a class="code" href="classboost_1_1gil_1_1detail_1_1step__iterator__adaptor.html">step_iterator_adaptor</a>(<span class="keyword">const</span> Iterator& 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> </div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  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> </div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="keyword">protected</span>:</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  SFn _step_fn;</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="keyword">private</span>:</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <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> </div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keywordtype">void</span> increment() { _step_fn.advance(this->base_reference(),1); }</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keywordtype">void</span> decrement() { _step_fn.advance(this->base_reference(),-1); }</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keywordtype">void</span> advance(base_difference_type d) { _step_fn.advance(this->base_reference(),d); }</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  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>& it)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> _step_fn.difference(this->base_reference(),it.base_reference()); }</div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span> };</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span> </div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <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> <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> <span class="keyword">template</span> <<span class="keyword">typename</span> D,<span class="keyword">typename</span> Iterator,<span class="keyword">typename</span> SFn> <span class="keyword">inline</span></div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="keywordtype">bool</span> operator>(<span class="keyword">const</span> <a class="code" href="classboost_1_1gil_1_1detail_1_1step__iterator__adaptor.html">step_iterator_adaptor<D,Iterator,SFn></a>& p1, <span class="keyword">const</span> <a class="code" href="classboost_1_1gil_1_1detail_1_1step__iterator__adaptor.html">step_iterator_adaptor<D,Iterator,SFn></a>& p2) {</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keywordflow">return</span> p1.step()>0 ? p1.base()> p2.base() : p1.base()< p2.base();</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span> }</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span> </div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="keyword">template</span> <<span class="keyword">typename</span> D,<span class="keyword">typename</span> Iterator,<span class="keyword">typename</span> SFn> <span class="keyword">inline</span></div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="keywordtype">bool</span> operator<(<span class="keyword">const</span> step_iterator_adaptor<D,Iterator,SFn>& p1, <span class="keyword">const</span> step_iterator_adaptor<D,Iterator,SFn>& p2) {</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keywordflow">return</span> p1.step()>0 ? p1.base()< p2.base() : p1.base()> p2.base();</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span> }</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span> </div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="keyword">template</span> <<span class="keyword">typename</span> D,<span class="keyword">typename</span> Iterator,<span class="keyword">typename</span> SFn> <span class="keyword">inline</span></div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="keywordtype">bool</span> operator>=(<span class="keyword">const</span> step_iterator_adaptor<D,Iterator,SFn>& p1, <span class="keyword">const</span> step_iterator_adaptor<D,Iterator,SFn>& p2) {</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="keywordflow">return</span> p1.step()>0 ? p1.base()>=p2.base() : p1.base()<=p2.base();</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span> }</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span> </div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="keyword">template</span> <<span class="keyword">typename</span> D,<span class="keyword">typename</span> Iterator,<span class="keyword">typename</span> SFn> <span class="keyword">inline</span></div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="keywordtype">bool</span> operator<=(<span class="keyword">const</span> step_iterator_adaptor<D,Iterator,SFn>& p1, <span class="keyword">const</span> step_iterator_adaptor<D,Iterator,SFn>& p2) {</div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="keywordflow">return</span> p1.step()>0 ? p1.base()<=p2.base() : p1.base()>=p2.base();</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span> }</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span> </div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="keyword">template</span> <<span class="keyword">typename</span> D,<span class="keyword">typename</span> Iterator,<span class="keyword">typename</span> SFn> <span class="keyword">inline</span></div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span> <span class="keywordtype">bool</span> operator==(<span class="keyword">const</span> step_iterator_adaptor<D,Iterator,SFn>& p1, <span class="keyword">const</span> step_iterator_adaptor<D,Iterator,SFn>& p2) {</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keywordflow">return</span> p1.base()==p2.base();</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span> }</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span> </div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span> <span class="keyword">template</span> <<span class="keyword">typename</span> D,<span class="keyword">typename</span> Iterator,<span class="keyword">typename</span> SFn> <span class="keyword">inline</span></div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <span class="keywordtype">bool</span> operator!=(<span class="keyword">const</span> step_iterator_adaptor<D,Iterator,SFn>& p1, <span class="keyword">const</span> step_iterator_adaptor<D,Iterator,SFn>& p2) {</div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="keywordflow">return</span> p1.base()!=p2.base();</div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span> }</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span> </div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span> } <span class="comment">// namespace detail</span></div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span> </div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span> </div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span> </div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Iterator></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> <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>  <span class="keyword">using</span> difference_type = std::ptrdiff_t;</div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span> </div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <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> </div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  difference_type difference(<span class="keyword">const</span> Iterator& it1, <span class="keyword">const</span> Iterator& 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>  <span class="keywordtype">void</span> advance(Iterator& 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>  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> </div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  <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> <span class="keyword">private</span>:</div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  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>  difference_type _step;</div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span> };</div><div class="line"><a name="l00136"></a><span class="lineno"> 136</span> </div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Iterator></div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span> <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><memory_based_step_iterator<Iterator>,</div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  Iterator,</div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  memunit_step_fn<Iterator>></div><div class="line"><a name="l00141"></a><span class="lineno"> 141</span> {</div><div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  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> <span class="keyword">public</span>:</div><div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  <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<memory_based_step_iterator<Iterator></a>,</div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  Iterator,</div><div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  <a class="code" href="structboost_1_1gil_1_1memunit__step__fn.html">memunit_step_fn<Iterator></a>>;</div><div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  <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>  <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>  <span class="keyword">using</span> x_iterator = Iterator;</div><div class="line"><a name="l00150"></a><span class="lineno"> 150</span> </div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  <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>  memory_based_step_iterator(Iterator it, std::ptrdiff_t memunit_step) : parent_t(it, memunit_step_fn<Iterator>(memunit_step)) {}</div><div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  <span class="keyword">template</span> <<span class="keyword">typename</span> I2></div><div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  memory_based_step_iterator(<span class="keyword">const</span> memory_based_step_iterator<I2>& it)</div><div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  : parent_t(it.base(), memunit_step_fn<Iterator>(it.step())) {}</div><div class="line"><a name="l00156"></a><span class="lineno"> 156</span> </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>  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> </div><div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  <span class="keywordtype">void</span> set_step(std::ptrdiff_t memunit_step) { this->_step_fn.set_step(memunit_step); }</div><div class="line"><a name="l00162"></a><span class="lineno"> 162</span> </div><div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  x_iterator& base() { <span class="keywordflow">return</span> parent_t::base_reference(); }</div><div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  x_iterator <span class="keyword">const</span>& 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> };</div><div class="line"><a name="l00166"></a><span class="lineno"> 166</span> </div><div class="line"><a name="l00167"></a><span class="lineno"> 167</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Iterator></div><div class="line"><a name="l00168"></a><span class="lineno"> 168</span> <span class="keyword">struct </span>const_iterator_type<memory_based_step_iterator<Iterator>> {</div><div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  <span class="keyword">using</span> type = memory_based_step_iterator<typename const_iterator_type<Iterator>::type>;</div><div class="line"><a name="l00170"></a><span class="lineno"> 170</span> };</div><div class="line"><a name="l00171"></a><span class="lineno"> 171</span> </div><div class="line"><a name="l00172"></a><span class="lineno"> 172</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Iterator></div><div class="line"><a name="l00173"></a><span class="lineno"> 173</span> <span class="keyword">struct </span>iterator_is_mutable<memory_based_step_iterator<Iterator>> : <span class="keyword">public</span> iterator_is_mutable<Iterator> {};</div><div class="line"><a name="l00174"></a><span class="lineno"> 174</span> </div><div class="line"><a name="l00175"></a><span class="lineno"> 175</span> </div><div class="line"><a name="l00177"></a><span class="lineno"> 177</span> <span class="comment">// IteratorAdaptorConcept</span></div><div class="line"><a name="l00179"></a><span class="lineno"> 179</span> <span class="comment"></span></div><div class="line"><a name="l00180"></a><span class="lineno"> 180</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Iterator></div><div class="line"><a name="l00181"></a><span class="lineno"> 181</span> <span class="keyword">struct </span>is_iterator_adaptor<memory_based_step_iterator<Iterator>> : std::true_type {};</div><div class="line"><a name="l00182"></a><span class="lineno"> 182</span> </div><div class="line"><a name="l00183"></a><span class="lineno"> 183</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Iterator></div><div class="line"><a name="l00184"></a><span class="lineno"> 184</span> <span class="keyword">struct </span>iterator_adaptor_get_base<memory_based_step_iterator<Iterator>></div><div class="line"><a name="l00185"></a><span class="lineno"> 185</span> {</div><div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  <span class="keyword">using</span> type = Iterator;</div><div class="line"><a name="l00187"></a><span class="lineno"> 187</span> };</div><div class="line"><a name="l00188"></a><span class="lineno"> 188</span> </div><div class="line"><a name="l00189"></a><span class="lineno"> 189</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Iterator, <span class="keyword">typename</span> NewBaseIterator></div><div class="line"><a name="l00190"></a><span class="lineno"> 190</span> <span class="keyword">struct </span>iterator_adaptor_rebind<memory_based_step_iterator<Iterator>, NewBaseIterator></div><div class="line"><a name="l00191"></a><span class="lineno"> 191</span> {</div><div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  <span class="keyword">using</span> type = memory_based_step_iterator<NewBaseIterator>;</div><div class="line"><a name="l00193"></a><span class="lineno"> 193</span> };</div><div class="line"><a name="l00194"></a><span class="lineno"> 194</span> </div><div class="line"><a name="l00196"></a><span class="lineno"> 196</span> <span class="comment">// PixelBasedConcept</span></div><div class="line"><a name="l00198"></a><span class="lineno"> 198</span> <span class="comment"></span></div><div class="line"><a name="l00199"></a><span class="lineno"> 199</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Iterator></div><div class="line"><a name="l00200"></a><span class="lineno"> 200</span> <span class="keyword">struct </span>color_space_type<memory_based_step_iterator<Iterator>> : <span class="keyword">public</span> color_space_type<Iterator> {};</div><div class="line"><a name="l00201"></a><span class="lineno"> 201</span> </div><div class="line"><a name="l00202"></a><span class="lineno"> 202</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Iterator></div><div class="line"><a name="l00203"></a><span class="lineno"> 203</span> <span class="keyword">struct </span>channel_mapping_type<memory_based_step_iterator<Iterator>> : <span class="keyword">public</span> channel_mapping_type<Iterator> {};</div><div class="line"><a name="l00204"></a><span class="lineno"> 204</span> </div><div class="line"><a name="l00205"></a><span class="lineno"> 205</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Iterator></div><div class="line"><a name="l00206"></a><span class="lineno"> 206</span> <span class="keyword">struct </span>is_planar<memory_based_step_iterator<Iterator>> : <span class="keyword">public</span> is_planar<Iterator> {};</div><div class="line"><a name="l00207"></a><span class="lineno"> 207</span> </div><div class="line"><a name="l00208"></a><span class="lineno"> 208</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Iterator></div><div class="line"><a name="l00209"></a><span class="lineno"> 209</span> <span class="keyword">struct </span>channel_type<memory_based_step_iterator<Iterator>> : <span class="keyword">public</span> channel_type<Iterator> {};</div><div class="line"><a name="l00210"></a><span class="lineno"> 210</span> </div><div class="line"><a name="l00212"></a><span class="lineno"> 212</span> <span class="comment">// MemoryBasedIteratorConcept</span></div><div class="line"><a name="l00214"></a><span class="lineno"> 214</span> <span class="comment"></span><span class="keyword">template</span> <<span class="keyword">typename</span> Iterator></div><div class="line"><a name="l00215"></a><span class="lineno"> 215</span> <span class="keyword">struct </span>byte_to_memunit<memory_based_step_iterator<Iterator>> : <span class="keyword">public</span> byte_to_memunit<Iterator> {};</div><div class="line"><a name="l00216"></a><span class="lineno"> 216</span> </div><div class="line"><a name="l00217"></a><span class="lineno"> 217</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Iterator></div><div class="line"><a name="l00218"></a><span class="lineno"> 218</span> <span class="keyword">inline</span> std::ptrdiff_t memunit_step(<span class="keyword">const</span> memory_based_step_iterator<Iterator>& p) { <span class="keywordflow">return</span> p.step(); }</div><div class="line"><a name="l00219"></a><span class="lineno"> 219</span> </div><div class="line"><a name="l00220"></a><span class="lineno"> 220</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Iterator></div><div class="line"><a name="l00221"></a><span class="lineno"> 221</span> <span class="keyword">inline</span> std::ptrdiff_t memunit_distance(<span class="keyword">const</span> memory_based_step_iterator<Iterator>& p1,</div><div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  <span class="keyword">const</span> memory_based_step_iterator<Iterator>& p2) {</div><div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  <span class="keywordflow">return</span> memunit_distance(p1.base(),p2.base());</div><div class="line"><a name="l00224"></a><span class="lineno"> 224</span> }</div><div class="line"><a name="l00225"></a><span class="lineno"> 225</span> </div><div class="line"><a name="l00226"></a><span class="lineno"> 226</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Iterator></div><div class="line"><a name="l00227"></a><span class="lineno"> 227</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> memunit_advance(memory_based_step_iterator<Iterator>& p,</div><div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  std::ptrdiff_t diff) {</div><div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  memunit_advance(p.base(), diff);</div><div class="line"><a name="l00230"></a><span class="lineno"> 230</span> }</div><div class="line"><a name="l00231"></a><span class="lineno"> 231</span> </div><div class="line"><a name="l00232"></a><span class="lineno"> 232</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Iterator></div><div class="line"><a name="l00233"></a><span class="lineno"> 233</span> <span class="keyword">inline</span> memory_based_step_iterator<Iterator></div><div class="line"><a name="l00234"></a><span class="lineno"> 234</span> memunit_advanced(<span class="keyword">const</span> memory_based_step_iterator<Iterator>& p,</div><div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  std::ptrdiff_t diff) {</div><div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  <span class="keywordflow">return</span> memory_based_step_iterator<Iterator>(memunit_advanced(p.base(), diff),p.step());</div><div class="line"><a name="l00237"></a><span class="lineno"> 237</span> }</div><div class="line"><a name="l00238"></a><span class="lineno"> 238</span> </div><div class="line"><a name="l00239"></a><span class="lineno"> 239</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Iterator></div><div class="line"><a name="l00240"></a><span class="lineno"> 240</span> <span class="keyword">inline</span> <span class="keyword">typename</span> std::iterator_traits<Iterator>::reference</div><div class="line"><a name="l00241"></a><span class="lineno"> 241</span> memunit_advanced_ref(<span class="keyword">const</span> memory_based_step_iterator<Iterator>& p,</div><div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  std::ptrdiff_t diff) {</div><div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  <span class="keywordflow">return</span> memunit_advanced_ref(p.base(), diff);</div><div class="line"><a name="l00244"></a><span class="lineno"> 244</span> }</div><div class="line"><a name="l00245"></a><span class="lineno"> 245</span> </div><div class="line"><a name="l00247"></a><span class="lineno"> 247</span> <span class="comment">// HasDynamicXStepTypeConcept</span></div><div class="line"><a name="l00249"></a><span class="lineno"> 249</span> <span class="comment"></span></div><div class="line"><a name="l00250"></a><span class="lineno"> 250</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Iterator></div><div class="line"><a name="l00251"></a><span class="lineno"> 251</span> <span class="keyword">struct </span>dynamic_x_step_type<memory_based_step_iterator<Iterator>> {</div><div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  <span class="keyword">using</span> type = memory_based_step_iterator<Iterator>;</div><div class="line"><a name="l00253"></a><span class="lineno"> 253</span> };</div><div class="line"><a name="l00254"></a><span class="lineno"> 254</span> </div><div class="line"><a name="l00255"></a><span class="lineno"> 255</span> <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> <span class="keyword">template</span> <<span class="keyword">typename</span> Iterator, <span class="keyword">typename</span> Deref></div><div class="line"><a name="l00257"></a><span class="lineno"> 257</span> <span class="keyword">struct </span>iterator_add_deref<memory_based_step_iterator<Iterator>,Deref> {</div><div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  GIL_CLASS_REQUIRE(Deref, boost::gil, PixelDereferenceAdaptorConcept)</div><div class="line"><a name="l00259"></a><span class="lineno"> 259</span> </div><div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  <span class="keyword">using</span> type = memory_based_step_iterator<typename iterator_add_deref<Iterator, Deref>::type>;</div><div class="line"><a name="l00261"></a><span class="lineno"> 261</span> </div><div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  <span class="keyword">static</span> type make(<span class="keyword">const</span> memory_based_step_iterator<Iterator>& it, <span class="keyword">const</span> Deref& d) { <span class="keywordflow">return</span> type(iterator_add_deref<Iterator, Deref>::make(it.base(),d),it.step()); }</div><div class="line"><a name="l00263"></a><span class="lineno"> 263</span> };</div><div class="line"><a name="l00264"></a><span class="lineno"> 264</span> </div><div class="line"><a name="l00268"></a><span class="lineno"> 268</span> </div><div class="line"><a name="l00269"></a><span class="lineno"> 269</span> <span class="keyword">template</span> <<span class="keyword">typename</span> I> <span class="keyword">typename</span> dynamic_x_step_type<I>::type make_step_iterator(<span class="keyword">const</span> I& it, std::ptrdiff_t step);</div><div class="line"><a name="l00270"></a><span class="lineno"> 270</span> </div><div class="line"><a name="l00271"></a><span class="lineno"> 271</span> <span class="keyword">namespace </span>detail {</div><div class="line"><a name="l00272"></a><span class="lineno"> 272</span> </div><div class="line"><a name="l00273"></a><span class="lineno"> 273</span> <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> <span class="keyword">template</span> <<span class="keyword">typename</span> I></div><div class="line"><a name="l00275"></a><span class="lineno"> 275</span> <span class="keyword">auto</span> make_step_iterator_impl(I <span class="keyword">const</span>& it, std::ptrdiff_t step, std::false_type)</div><div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  -> <span class="keyword">typename</span> dynamic_x_step_type<I>::type</div><div class="line"><a name="l00277"></a><span class="lineno"> 277</span> {</div><div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  <span class="keywordflow">return</span> memory_based_step_iterator<I>(it, step);</div><div class="line"><a name="l00279"></a><span class="lineno"> 279</span> }</div><div class="line"><a name="l00280"></a><span class="lineno"> 280</span> </div><div class="line"><a name="l00281"></a><span class="lineno"> 281</span> <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> <span class="keyword">template</span> <<span class="keyword">typename</span> I></div><div class="line"><a name="l00283"></a><span class="lineno"> 283</span> <span class="keyword">auto</span> make_step_iterator_impl(I <span class="keyword">const</span>& it, std::ptrdiff_t step, std::true_type)</div><div class="line"><a name="l00284"></a><span class="lineno"> 284</span>  -> <span class="keyword">typename</span> dynamic_x_step_type<I>::type</div><div class="line"><a name="l00285"></a><span class="lineno"> 285</span> {</div><div class="line"><a name="l00286"></a><span class="lineno"> 286</span>  <span class="keywordflow">return</span> make_step_iterator(it.base(), step);</div><div class="line"><a name="l00287"></a><span class="lineno"> 287</span> }</div><div class="line"><a name="l00288"></a><span class="lineno"> 288</span> </div><div class="line"><a name="l00289"></a><span class="lineno"> 289</span> <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> <span class="keyword">template</span> <<span class="keyword">typename</span> BaseIt></div><div class="line"><a name="l00291"></a><span class="lineno"> 291</span> <span class="keyword">auto</span> make_step_iterator_impl(</div><div class="line"><a name="l00292"></a><span class="lineno"> 292</span>  memory_based_step_iterator<BaseIt> <span class="keyword">const</span>& it,</div><div class="line"><a name="l00293"></a><span class="lineno"> 293</span>  std::ptrdiff_t step,</div><div class="line"><a name="l00294"></a><span class="lineno"> 294</span>  std::true_type)</div><div class="line"><a name="l00295"></a><span class="lineno"> 295</span>  -> memory_based_step_iterator<BaseIt></div><div class="line"><a name="l00296"></a><span class="lineno"> 296</span> {</div><div class="line"><a name="l00297"></a><span class="lineno"> 297</span>  <span class="keywordflow">return</span> memory_based_step_iterator<BaseIt>(it.base(), step);</div><div class="line"><a name="l00298"></a><span class="lineno"> 298</span> }</div><div class="line"><a name="l00299"></a><span class="lineno"> 299</span> </div><div class="line"><a name="l00300"></a><span class="lineno"> 300</span> } <span class="comment">// namespace detail</span></div><div class="line"><a name="l00301"></a><span class="lineno"> 301</span> </div><div class="line"><a name="l00315"></a><span class="lineno"> 315</span> <span class="keyword">template</span> <<span class="keyword">typename</span> I> <span class="comment">// Models MemoryBasedIteratorConcept, HasDynamicXStepTypeConcept</span></div><div class="line"><a name="l00316"></a><span class="lineno"> 316</span> <span class="keyword">typename</span> dynamic_x_step_type<I>::type make_step_iterator(<span class="keyword">const</span> I& it, std::ptrdiff_t step) {</div><div class="line"><a name="l00317"></a><span class="lineno"> 317</span>  <span class="keywordflow">return</span> detail::make_step_iterator_impl(it, step, <span class="keyword">typename</span> is_iterator_adaptor<I>::type());</div><div class="line"><a name="l00318"></a><span class="lineno"> 318</span> }</div><div class="line"><a name="l00319"></a><span class="lineno"> 319</span> </div><div class="line"><a name="l00320"></a><span class="lineno"> 320</span> }} <span class="comment">// namespace boost::gil</span></div><div class="line"><a name="l00321"></a><span class="lineno"> 321</span> </div><div class="line"><a name="l00322"></a><span class="lineno"> 322</span> <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>
- <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>
- <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>
- <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>
- <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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