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<li class="navelem"><b>boost</b></li><li class="navelem"><b>gil</b></li><li class="navelem"><a class="el" href="structboost_1_1gil_1_1position__iterator.html">position_iterator</a></li>  </ul>
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<div class="title">position_iterator&lt; Deref, Dim &gt; Struct Template Reference<div class="ingroups"><a class="el" href="group___pixel_iterator.html">Pixel Iterator</a> &raquo; <a class="el" href="group___pixel_iterator_model.html">Models</a> &raquo; <a class="el" href="group___pixel_iterator_model_virtual.html">position_iterator</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>An iterator that remembers its current X,Y position and invokes a function object with it upon dereferencing. Used to create virtual image views. Models: <a class="el" href="structboost_1_1gil_1_1_step_iterator_concept.html" title="Step iterator concept.">StepIteratorConcept</a>, <a class="el" href="structboost_1_1gil_1_1_pixel_iterator_concept.html" title="An STL random access traversal iterator over a model of PixelConcept.">PixelIteratorConcept</a>, <a class="el" href="structboost_1_1gil_1_1_pixel_based_concept.html" title="Concept for all pixel-based GIL constructs.">PixelBasedConcept</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 href="structboost_1_1gil_1_1position__iterator.html#details">More...</a></p>

<p><code>#include &lt;<a class="el" href="position__iterator_8hpp_source.html">position_iterator.hpp</a>&gt;</code></p>

<p>Inherits iterator_facade&lt; position_iterator&lt; Deref, Dim &gt;, Deref::value_type, std::random_access_iterator_tag, Deref::reference, Deref::argument_type::template axis&lt; Dim &gt;::coord_t &gt;.</p>
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Public Types</h2></td></tr>
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using&#160;</td><td class="memItemRight" valign="bottom"><b>parent_t</b> = iterator_facade&lt; <a class="el" href="structboost_1_1gil_1_1position__iterator.html">position_iterator</a>&lt; Deref, Dim &gt;, typename Deref::value_type, std::random_access_iterator_tag, typename Deref::reference, typename Deref::argument_type::template axis&lt; Dim &gt;::coord_t &gt;</td></tr>
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using&#160;</td><td class="memItemRight" valign="bottom"><b>difference_type</b> = typename parent_t::difference_type</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>point_t</b> = typename Deref::argument_type</td></tr>
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&#160;</td><td class="memItemRight" valign="bottom"><b>position_iterator</b> (const point_t &amp;p, const point_t &amp;step, const Deref &amp;d)</td></tr>
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&#160;</td><td class="memItemRight" valign="bottom"><b>position_iterator</b> (const <a class="el" href="structboost_1_1gil_1_1position__iterator.html">position_iterator</a> &amp;p)</td></tr>
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template&lt;typename D &gt; </td></tr>
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<a class="el" href="structboost_1_1gil_1_1position__iterator.html">position_iterator</a> &amp;&#160;</td><td class="memItemRight" valign="bottom"><b>operator=</b> (const <a class="el" href="structboost_1_1gil_1_1position__iterator.html">position_iterator</a> &amp;p)</td></tr>
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const point_t &amp;&#160;</td><td class="memItemRight" valign="bottom"><b>pos</b> () const</td></tr>
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const point_t &amp;&#160;</td><td class="memItemRight" valign="bottom"><b>step</b> () const</td></tr>
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const Deref &amp;&#160;</td><td class="memItemRight" valign="bottom"><b>deref_fn</b> () const</td></tr>
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void&#160;</td><td class="memItemRight" valign="bottom"><b>set_step</b> (difference_type s)</td></tr>
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<tr class="memitem:a16d8e6857dd561244ca73764f2b94801"><td class="memItemLeft" align="right" valign="top">reference&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structboost_1_1gil_1_1position__iterator.html#a16d8e6857dd561244ca73764f2b94801">operator[]</a> (difference_type d) const</td></tr>
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template&lt;typename DE , int DI&gt; </td></tr>
<tr class="memitem:a4c7e6e64e2ac787c24c2bc336b135dce"><td class="memTemplItemLeft" align="right" valign="top">struct&#160;</td><td class="memTemplItemRight" valign="bottom"><b>position_iterator</b></td></tr>
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class&#160;</td><td class="memItemRight" valign="bottom"><b>boost::iterator_core_access</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 Deref, int Dim&gt;<br />
struct boost::gil::position_iterator&lt; Deref, Dim &gt;</h3>

<p>An iterator that remembers its current X,Y position and invokes a function object with it upon dereferencing. Used to create virtual image views. Models: <a class="el" href="structboost_1_1gil_1_1_step_iterator_concept.html" title="Step iterator concept.">StepIteratorConcept</a>, <a class="el" href="structboost_1_1gil_1_1_pixel_iterator_concept.html" title="An STL random access traversal iterator over a model of PixelConcept.">PixelIteratorConcept</a>, <a class="el" href="structboost_1_1gil_1_1_pixel_based_concept.html" title="Concept for all pixel-based GIL constructs.">PixelBasedConcept</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>. </p>
<dl class="tparams"><dt>Template Parameters</dt><dd>
  <table class="tparams">
    <tr><td class="paramname">Deref</td><td>A function object that given a point returns a pixel reference. Models <a class="el" href="structboost_1_1gil_1_1_pixel_dereference_adaptor_concept.html" title="Represents a unary function object that can be invoked upon dereferencing a pixel iterator.">PixelDereferenceAdaptorConcept</a> </td></tr>
    <tr><td class="paramname">Dim</td><td>Dimension to advance along </td></tr>
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</dl>
</div><h2 class="groupheader">Member Function Documentation</h2>
<a id="a16d8e6857dd561244ca73764f2b94801"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a16d8e6857dd561244ca73764f2b94801">&#9670;&nbsp;</a></span>operator[]()</h2>

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          <td class="memname">reference operator[] </td>
          <td>(</td>
          <td class="paramtype">difference_type&#160;</td>
          <td class="paramname"><em>d</em></td><td>)</td>
          <td> const</td>
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<p>For some reason operator[] provided by iterator_adaptor returns a custom class that is convertible to reference We require our own reference because it is registered in iterator_traits </p>

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<hr/>The documentation for this struct was generated from the following file:<ul>
<li><a class="el" href="position__iterator_8hpp_source.html">position_iterator.hpp</a></li>
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