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<div class="title">memory_based_2d_locator&lt; StepIterator &gt; Class Template Reference<div class="ingroups"><a class="el" href="group___pixel_locator.html">Pixel Locator</a> &raquo; <a class="el" href="group___pixel_locator_model.html">Models</a><a class="el" href="group___pixel_based.html">PixelBased</a> &raquo;  &#124; <a class="el" href="group___pixel_based_model.html">Models</a></div></div>  </div>
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<p>Memory-based pixel locator. Models: <a class="el" href="structboost_1_1gil_1_1_pixel_locator_concept.html" title="GIL&#39;s 2-dimensional locator over immutable GIL pixels.">PixelLocatorConcept</a>,<a class="el" href="structboost_1_1gil_1_1_has_dynamic_x_step_type_concept.html" title="Concept for iterators, locators and views that can define a type just like the given iterator,...">HasDynamicXStepTypeConcept</a>,<a class="el" href="structboost_1_1gil_1_1_has_dynamic_y_step_type_concept.html" title="Concept for locators and views that can define a type just like the given locator or view,...">HasDynamicYStepTypeConcept</a>,<a class="el" href="structboost_1_1gil_1_1_has_transposed_type_concept.html" title="Concept for locators and views that can define a type just like the given locator or view,...">HasTransposedTypeConcept</a>The class takes a step iterator as a parameter. The step iterator provides navigation along the vertical axis while its base iterator provides horizontal navigation.  
 <a href="classboost_1_1gil_1_1memory__based__2d__locator.html#details">More...</a></p>

<p><code>#include &lt;<a class="el" href="locator_8hpp_source.html">locator.hpp</a>&gt;</code></p>
<div class="dynheader">
Inheritance diagram for memory_based_2d_locator&lt; StepIterator &gt;:</div>
<div class="dyncontent">
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  <img src="classboost_1_1gil_1_1memory__based__2d__locator.png" usemap="#memory_5Fbased_5F2d_5Flocator_3C_20StepIterator_20_3E_map" alt=""/>
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<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-types"></a>
Public Types</h2></td></tr>
<tr class="memitem:a401101d1c66195bf53c23be02e63a9fa"><td class="memItemLeft" align="right" valign="top"><a id="a401101d1c66195bf53c23be02e63a9fa"></a>
using&#160;</td><td class="memItemRight" valign="bottom"><b>parent_t</b> = <a class="el" href="classboost_1_1gil_1_1pixel__2d__locator__base.html">pixel_2d_locator_base</a>&lt; <a class="el" href="classboost_1_1gil_1_1memory__based__2d__locator.html">memory_based_2d_locator</a>&lt; StepIterator &gt;, typename <a class="el" href="structboost_1_1gil_1_1iterator__adaptor__get__base.html">iterator_adaptor_get_base</a>&lt; StepIterator &gt;::type, StepIterator &gt;</td></tr>
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using&#160;</td><td class="memItemRight" valign="bottom"><b>const_t</b> = <a class="el" href="classboost_1_1gil_1_1memory__based__2d__locator.html">memory_based_2d_locator</a>&lt; typename <a class="el" href="structboost_1_1gil_1_1const__iterator__type.html">const_iterator_type</a>&lt; StepIterator &gt;::type &gt;</td></tr>
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using&#160;</td><td class="memItemRight" valign="bottom"><b>coord_t</b> = typename parent_t::coord_t</td></tr>
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using&#160;</td><td class="memItemRight" valign="bottom"><b>x_coord_t</b> = typename parent_t::x_coord_t</td></tr>
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using&#160;</td><td class="memItemRight" valign="bottom"><b>y_coord_t</b> = typename parent_t::y_coord_t</td></tr>
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using&#160;</td><td class="memItemRight" valign="bottom"><b>x_iterator</b> = typename parent_t::x_iterator</td></tr>
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using&#160;</td><td class="memItemRight" valign="bottom"><b>y_iterator</b> = typename parent_t::y_iterator</td></tr>
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using&#160;</td><td class="memItemRight" valign="bottom"><b>difference_type</b> = typename <a class="el" href="classboost_1_1gil_1_1point.html">parent_t::difference_type</a></td></tr>
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using&#160;</td><td class="memItemRight" valign="bottom"><b>reference</b> = typename parent_t::reference</td></tr>
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using&#160;</td><td class="memItemRight" valign="bottom"><b>cached_location_t</b> = std::ptrdiff_t</td></tr>
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<tr class="inherit_header pub_types_classboost_1_1gil_1_1pixel__2d__locator__base"><td colspan="2" onclick="javascript:toggleInherit('pub_types_classboost_1_1gil_1_1pixel__2d__locator__base')"><img src="closed.png" alt="-"/>&#160;Public Types inherited from <a class="el" href="classboost_1_1gil_1_1pixel__2d__locator__base.html">pixel_2d_locator_base&lt; memory_based_2d_locator&lt; StepIterator &gt;, iterator_adaptor_get_base&lt; StepIterator &gt;::type, StepIterator &gt;</a></td></tr>
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using&#160;</td><td class="memItemRight" valign="bottom"><b>x_iterator</b> = <a class="el" href="structboost_1_1gil_1_1iterator__adaptor__get__base.html">iterator_adaptor_get_base</a>&lt; StepIterator &gt;::type</td></tr>
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using&#160;</td><td class="memItemRight" valign="bottom"><b>y_iterator</b> = StepIterator</td></tr>
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using&#160;</td><td class="memItemRight" valign="bottom"><b>value_type</b> = typename std::iterator_traits&lt; x_iterator &gt;::value_type</td></tr>
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using&#160;</td><td class="memItemRight" valign="bottom"><b>reference</b> = typename std::iterator_traits&lt; x_iterator &gt;::reference</td></tr>
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<tr class="memitem:a6b1fc581762647c48e112deb1b043ab5 inherit pub_types_classboost_1_1gil_1_1pixel__2d__locator__base"><td class="memItemLeft" align="right" valign="top"><a id="a6b1fc581762647c48e112deb1b043ab5"></a>
using&#160;</td><td class="memItemRight" valign="bottom"><b>coord_t</b> = typename std::iterator_traits&lt; x_iterator &gt;::<a class="el" href="classboost_1_1gil_1_1point.html">difference_type</a></td></tr>
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using&#160;</td><td class="memItemRight" valign="bottom"><b>difference_type</b> = <a class="el" href="classboost_1_1gil_1_1point.html">point</a>&lt; coord_t &gt;</td></tr>
<tr class="separator:afb01b687e5fb83d62030e97956f78df8 inherit pub_types_classboost_1_1gil_1_1pixel__2d__locator__base"><td class="memSeparator" colspan="2">&#160;</td></tr>
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using&#160;</td><td class="memItemRight" valign="bottom"><b>point_t</b> = <a class="el" href="classboost_1_1gil_1_1point.html">difference_type</a></td></tr>
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using&#160;</td><td class="memItemRight" valign="bottom"><b>x_coord_t</b> = typename point_t::template axis&lt; 0 &gt;::coord_t</td></tr>
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<tr class="memitem:a1f91fc1334430fa1687684fcc107b480 inherit pub_types_classboost_1_1gil_1_1pixel__2d__locator__base"><td class="memItemLeft" align="right" valign="top"><a id="a1f91fc1334430fa1687684fcc107b480"></a>
using&#160;</td><td class="memItemRight" valign="bottom"><b>y_coord_t</b> = typename point_t::template axis&lt; 1 &gt;::coord_t</td></tr>
<tr class="separator:a1f91fc1334430fa1687684fcc107b480 inherit pub_types_classboost_1_1gil_1_1pixel__2d__locator__base"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a7192e60183dc5bbaaa9c9344e2b00ccc inherit pub_types_classboost_1_1gil_1_1pixel__2d__locator__base"><td class="memItemLeft" align="right" valign="top"><a id="a7192e60183dc5bbaaa9c9344e2b00ccc"></a>
using&#160;</td><td class="memItemRight" valign="bottom"><b>cached_location_t</b> = <a class="el" href="classboost_1_1gil_1_1point.html">difference_type</a></td></tr>
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</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:ac2c9b2764bf9fd23c1992234c112d960"><td class="memItemLeft" align="right" valign="top"><a id="ac2c9b2764bf9fd23c1992234c112d960"></a>
&#160;</td><td class="memItemRight" valign="bottom"><b>memory_based_2d_locator</b> (const StepIterator &amp;yit)</td></tr>
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<tr class="memitem:a0b752ab53eb9e889fb895655a966cb3b"><td class="memTemplParams" colspan="2"><a id="a0b752ab53eb9e889fb895655a966cb3b"></a>
template&lt;typename SI &gt; </td></tr>
<tr class="memitem:a0b752ab53eb9e889fb895655a966cb3b"><td class="memTemplItemLeft" align="right" valign="top">&#160;</td><td class="memTemplItemRight" valign="bottom"><b>memory_based_2d_locator</b> (const <a class="el" href="classboost_1_1gil_1_1memory__based__2d__locator.html">memory_based_2d_locator</a>&lt; SI &gt; &amp;loc, coord_t y_step)</td></tr>
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<tr class="memitem:a783be33dde25e847076010bad6d79a6c"><td class="memTemplParams" colspan="2"><a id="a783be33dde25e847076010bad6d79a6c"></a>
template&lt;typename SI &gt; </td></tr>
<tr class="memitem:a783be33dde25e847076010bad6d79a6c"><td class="memTemplItemLeft" align="right" valign="top">&#160;</td><td class="memTemplItemRight" valign="bottom"><b>memory_based_2d_locator</b> (const <a class="el" href="classboost_1_1gil_1_1memory__based__2d__locator.html">memory_based_2d_locator</a>&lt; SI &gt; &amp;loc, coord_t x_step, coord_t y_step, bool transpose=false)</td></tr>
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&#160;</td><td class="memItemRight" valign="bottom"><b>memory_based_2d_locator</b> (x_iterator xit, std::ptrdiff_t row_bytes)</td></tr>
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template&lt;typename X &gt; </td></tr>
<tr class="memitem:ad6c18dc848130253be0092ad120b8a15"><td class="memTemplItemLeft" align="right" valign="top">&#160;</td><td class="memTemplItemRight" valign="bottom"><b>memory_based_2d_locator</b> (const <a class="el" href="classboost_1_1gil_1_1memory__based__2d__locator.html">memory_based_2d_locator</a>&lt; X &gt; &amp;pl)</td></tr>
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&#160;</td><td class="memItemRight" valign="bottom"><b>memory_based_2d_locator</b> (const <a class="el" href="classboost_1_1gil_1_1memory__based__2d__locator.html">memory_based_2d_locator</a> &amp;pl)</td></tr>
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<a class="el" href="classboost_1_1gil_1_1memory__based__2d__locator.html">memory_based_2d_locator</a> &amp;&#160;</td><td class="memItemRight" valign="bottom"><b>operator=</b> (<a class="el" href="classboost_1_1gil_1_1memory__based__2d__locator.html">memory_based_2d_locator</a> const &amp;other)=default</td></tr>
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bool&#160;</td><td class="memItemRight" valign="bottom"><b>operator==</b> (const <a class="el" href="classboost_1_1gil_1_1memory__based__2d__locator.html">this_t</a> &amp;p) const</td></tr>
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x_iterator const  &amp;&#160;</td><td class="memItemRight" valign="bottom"><b>x</b> () const</td></tr>
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y_iterator const  &amp;&#160;</td><td class="memItemRight" valign="bottom"><b>y</b> () const</td></tr>
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x_iterator &amp;&#160;</td><td class="memItemRight" valign="bottom"><b>x</b> ()</td></tr>
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y_iterator &amp;&#160;</td><td class="memItemRight" valign="bottom"><b>y</b> ()</td></tr>
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x_iterator&#160;</td><td class="memItemRight" valign="bottom"><b>x_at</b> (x_coord_t dx, y_coord_t dy) const</td></tr>
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x_iterator&#160;</td><td class="memItemRight" valign="bottom"><b>x_at</b> (const difference_type &amp;d) const</td></tr>
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<a class="el" href="classboost_1_1gil_1_1memory__based__2d__locator.html">this_t</a>&#160;</td><td class="memItemRight" valign="bottom"><b>xy_at</b> (x_coord_t dx, y_coord_t dy) const</td></tr>
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reference&#160;</td><td class="memItemRight" valign="bottom"><b>operator()</b> (x_coord_t dx, y_coord_t dy) const</td></tr>
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reference&#160;</td><td class="memItemRight" valign="bottom"><b>operator[]</b> (const difference_type &amp;d) const</td></tr>
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<a class="el" href="classboost_1_1gil_1_1memory__based__2d__locator.html">this_t</a> &amp;&#160;</td><td class="memItemRight" valign="bottom"><b>operator+=</b> (const difference_type &amp;d)</td></tr>
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<a class="el" href="classboost_1_1gil_1_1memory__based__2d__locator.html">this_t</a> &amp;&#160;</td><td class="memItemRight" valign="bottom"><b>operator-=</b> (const difference_type &amp;d)</td></tr>
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cached_location_t&#160;</td><td class="memItemRight" valign="bottom"><b>cache_location</b> (const difference_type &amp;d) const</td></tr>
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cached_location_t&#160;</td><td class="memItemRight" valign="bottom"><b>cache_location</b> (x_coord_t dx, y_coord_t dy) const</td></tr>
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reference&#160;</td><td class="memItemRight" valign="bottom"><b>operator[]</b> (const cached_location_t &amp;loc) const</td></tr>
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std::ptrdiff_t&#160;</td><td class="memItemRight" valign="bottom"><b>row_size</b> () const</td></tr>
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std::ptrdiff_t&#160;</td><td class="memItemRight" valign="bottom"><b>pixel_size</b> () const</td></tr>
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bool&#160;</td><td class="memItemRight" valign="bottom"><b>is_1d_traversable</b> (x_coord_t width) const</td></tr>
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std::ptrdiff_t&#160;</td><td class="memItemRight" valign="bottom"><b>y_distance_to</b> (<a class="el" href="classboost_1_1gil_1_1memory__based__2d__locator.html">this_t</a> const &amp;p2, x_coord_t xDiff) const</td></tr>
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bool&#160;</td><td class="memItemRight" valign="bottom"><b>operator!=</b> (const <a class="el" href="classboost_1_1gil_1_1memory__based__2d__locator.html">memory_based_2d_locator</a>&lt; StepIterator &gt; &amp;p) const</td></tr>
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x_iterator&#160;</td><td class="memItemRight" valign="bottom"><b>x_at</b> (x_coord_t dx, y_coord_t dy) const</td></tr>
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x_iterator&#160;</td><td class="memItemRight" valign="bottom"><b>x_at</b> (const <a class="el" href="classboost_1_1gil_1_1point.html">difference_type</a> &amp;d) const</td></tr>
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y_iterator&#160;</td><td class="memItemRight" valign="bottom"><b>y_at</b> (x_coord_t dx, y_coord_t dy) const</td></tr>
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y_iterator&#160;</td><td class="memItemRight" valign="bottom"><b>y_at</b> (const <a class="el" href="classboost_1_1gil_1_1point.html">difference_type</a> &amp;d) const</td></tr>
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<a class="el" href="classboost_1_1gil_1_1memory__based__2d__locator.html">memory_based_2d_locator</a>&lt; StepIterator &gt;&#160;</td><td class="memItemRight" valign="bottom"><b>xy_at</b> (x_coord_t dx, y_coord_t dy) const</td></tr>
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axis&lt; D &gt;::iterator &amp;&#160;</td><td class="memItemRight" valign="bottom"><b>axis_iterator</b> ()</td></tr>
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axis&lt; D &gt;::iterator const &amp;&#160;</td><td class="memItemRight" valign="bottom"><b>axis_iterator</b> () const</td></tr>
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axis&lt; D &gt;::iterator&#160;</td><td class="memItemRight" valign="bottom"><b>axis_iterator</b> (const <a class="el" href="classboost_1_1gil_1_1point.html">point_t</a> &amp;p) const</td></tr>
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reference&#160;</td><td class="memItemRight" valign="bottom"><b>operator()</b> (x_coord_t dx, y_coord_t dy) const</td></tr>
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reference&#160;</td><td class="memItemRight" valign="bottom"><b>operator[]</b> (const <a class="el" href="classboost_1_1gil_1_1point.html">difference_type</a> &amp;d) const</td></tr>
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reference&#160;</td><td class="memItemRight" valign="bottom"><b>operator *</b> () const</td></tr>
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<a class="el" href="classboost_1_1gil_1_1memory__based__2d__locator.html">memory_based_2d_locator</a>&lt; StepIterator &gt; &amp;&#160;</td><td class="memItemRight" valign="bottom"><b>operator+=</b> (const <a class="el" href="classboost_1_1gil_1_1point.html">difference_type</a> &amp;d)</td></tr>
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template&lt;typename X &gt; </td></tr>
<tr class="memitem:aa3d47826a98177d5ae9c665603ab5f57"><td class="memTemplItemLeft" align="right" valign="top">class&#160;</td><td class="memTemplItemRight" valign="bottom"><b>memory_based_2d_locator</b></td></tr>
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Additional Inherited Members</h2></td></tr>
<tr class="inherit_header pub_static_attribs_classboost_1_1gil_1_1pixel__2d__locator__base"><td colspan="2" onclick="javascript:toggleInherit('pub_static_attribs_classboost_1_1gil_1_1pixel__2d__locator__base')"><img src="closed.png" alt="-"/>&#160;Static Public Attributes inherited from <a class="el" href="classboost_1_1gil_1_1pixel__2d__locator__base.html">pixel_2d_locator_base&lt; memory_based_2d_locator&lt; StepIterator &gt;, iterator_adaptor_get_base&lt; StepIterator &gt;::type, StepIterator &gt;</a></td></tr>
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static const std::size_t&#160;</td><td class="memItemRight" valign="bottom"><b>num_dimensions</b></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><h3>template&lt;typename StepIterator&gt;<br />
class boost::gil::memory_based_2d_locator&lt; StepIterator &gt;</h3>

<p>Memory-based pixel locator. Models: <a class="el" href="structboost_1_1gil_1_1_pixel_locator_concept.html" title="GIL&#39;s 2-dimensional locator over immutable GIL pixels.">PixelLocatorConcept</a>,<a class="el" href="structboost_1_1gil_1_1_has_dynamic_x_step_type_concept.html" title="Concept for iterators, locators and views that can define a type just like the given iterator,...">HasDynamicXStepTypeConcept</a>,<a class="el" href="structboost_1_1gil_1_1_has_dynamic_y_step_type_concept.html" title="Concept for locators and views that can define a type just like the given locator or view,...">HasDynamicYStepTypeConcept</a>,<a class="el" href="structboost_1_1gil_1_1_has_transposed_type_concept.html" title="Concept for locators and views that can define a type just like the given locator or view,...">HasTransposedTypeConcept</a></p>
<p>The class takes a step iterator as a parameter. The step iterator provides navigation along the vertical axis while its base iterator provides horizontal navigation. </p>
<p>Each instantiation is optimal in terms of size and efficiency. For example, xy locator over interleaved rgb image results in a step iterator consisting of one std::ptrdiff_t for the row size and one native pointer (8 bytes total). ++locator.x() resolves to pointer increment. At the other extreme, a 2D navigation of the even pixels of a planar CMYK image results in a step iterator consisting of one std::ptrdiff_t for the doubled row size, and one step iterator consisting of one std::ptrdiff_t for the horizontal step of two and a CMYK <a class="el" href="structboost_1_1gil_1_1planar__pixel__iterator.html" title="An iterator over planar pixels. Models HomogeneousColorBaseConcept, PixelIteratorConcept,...">planar_pixel_iterator</a> consisting of 4 pointers (24 bytes). In this case ++locator.x() results in four native pointer additions.</p>
<p>Note also that <code><a class="el" href="classboost_1_1gil_1_1memory__based__2d__locator.html" title="Memory-based pixel locator. Models: PixelLocatorConcept,HasDynamicXStepTypeConcept,...">memory_based_2d_locator</a></code> does not require that its element type be a pixel. It could be instantiated with an iterator whose <code>value_type</code> models only <code><a class="el" href="structboost_1_1gil_1_1_regular.html" title="Concept for type regularity requirement.">Regular</a></code>. In this case the locator models the weaker <a class="el" href="structboost_1_1gil_1_1_random_access2_d_locator_concept.html" title="2-dimensional locator over immutable values">RandomAccess2DLocatorConcept</a>, and does not model <a class="el" href="structboost_1_1gil_1_1_pixel_based_concept.html" title="Concept for all pixel-based GIL constructs.">PixelBasedConcept</a>. Many generic algorithms don't require the elements to be pixels. </p>
</div><hr/>The documentation for this class was generated from the following files:<ul>
<li><a class="el" href="algorithm_8hpp_source.html">algorithm.hpp</a></li>
<li><a class="el" href="locator_8hpp_source.html">locator.hpp</a></li>
</ul>
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