<!-- Copyright 2008 Lubomir Bourdev and Hailin Jin Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) --> <!-- Copyright 2005-2007 Adobe Systems Incorporated Distributed under the MIT License (see accompanying file LICENSE_1_0_0.txt or a copy at http://stlab.adobe.com/licenses.html) Some files are held under additional license. 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Models <a class="el" href="g_i_l_0380.html" title="Step iterator concept.">StepIteratorConcept</a>, <a class="el" href="g_i_l_0310.html" title="Iterator adaptor is a forward iterator adapting another forward iterator.">IteratorAdaptorConcept</a>, <a class="el" href="g_i_l_0312.html" title="Concept of a random-access iterator that can be advanced in memory units (bytes or...">MemoryBasedIteratorConcept</a>, <a class="el" href="g_i_l_0352.html" title="An STL random access traversal iterator over a model of PixelConcept.">PixelIteratorConcept</a>, <a class="el" href="g_i_l_0290.html" title="Concept for iterators, locators and views that can define a type just like the given...">HasDynamicXStepTypeConcept</a>. <p> MEMORY-BASED STEP ITERATOR<p> A refinement of step_iterator_adaptor that uses a dynamic parameter for the step which is specified in memory units, such as bytes or bits<p> Pixel step iterators are used to provide iteration over non-adjacent pixels. Common use is a vertical traversal, where the step is the row stride.<p> Another application is as a sub-channel view. For example, a red intensity <a class="el" href="g_i_l_0038.html" title="container interface over image view. Models ImageConcept, PixelBasedConcept">image</a> over interleaved RGB data would use a step iterator adaptor with step sizeof(channel_t)*3 In the latter example the step <a class="el" href="g_i_l_0621.html" title="Returns an MPL integral type specifying the number of elements in a color base.">size</a> could be fixed at compile time for efficiency. Compile-time fixed step can be implemented by providing a step function object that takes the step as a template <table border="0" cellpadding="0" cellspacing="0"> <tr><td></td></tr> <tr><td colspan="2"><br><h2>Public Types</h2></td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="bc15672c336b287b81a4bd69f0986753"></a><!-- doxytag: member="boost::gil::memory_based_step_iterator::parent_t" ref="bc15672c336b287b81a4bd69f0986753" args="" --> typedef <br> <a class="el" href="g_i_l_0036.html">detail::step_iterator_adaptor</a><br> < <a class="el" href="g_i_l_0046.html">memory_based_step_iterator</a><br> < Iterator >, Iterator, <br> <a class="el" href="g_i_l_0576.html">memunit_step_fn</a>< Iterator > > </td><td class="memItemRight" valign="bottom"><b>parent_t</b></td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="6c80bdd4dcae459dd371e3d941b83468"></a><!-- doxytag: member="boost::gil::memory_based_step_iterator::reference" ref="6c80bdd4dcae459dd371e3d941b83468" args="" --> typedef parent_t::reference </td><td class="memItemRight" valign="bottom"><b>reference</b></td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="af1864eda36a1748894be741b3d64bde"></a><!-- doxytag: member="boost::gil::memory_based_step_iterator::difference_type" ref="af1864eda36a1748894be741b3d64bde" args="" --> typedef parent_t::difference_type </td><td class="memItemRight" valign="bottom"><b>difference_type</b></td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="6c92dba2feb25a3b182a2a78de4cddb5"></a><!-- doxytag: member="boost::gil::memory_based_step_iterator::x_iterator" ref="6c92dba2feb25a3b182a2a78de4cddb5" args="" --> typedef Iterator </td><td class="memItemRight" valign="bottom"><b>x_iterator</b></td></tr> <tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="1c335f11e1be5ae1444d6556e5c4c59f"></a><!-- doxytag: member="boost::gil::memory_based_step_iterator::memory_based_step_iterator" ref="1c335f11e1be5ae1444d6556e5c4c59f" args="(Iterator it, std::ptrdiff_t memunit_step)" --> </td><td class="memItemRight" valign="bottom"><b>memory_based_step_iterator</b> (Iterator it, std::ptrdiff_t memunit_step)</td></tr> <tr><td class="memTemplParams" nowrap colspan="2"><a class="anchor" name="c9aedc29ca8f724bd7e3c56ca6d779cd"></a><!-- doxytag: member="boost::gil::memory_based_step_iterator::memory_based_step_iterator" ref="c9aedc29ca8f724bd7e3c56ca6d779cd" args="(const memory_based_step_iterator< I2 > &it)" --> template<typename I2> </td></tr> <tr><td class="memTemplItemLeft" nowrap align="right" valign="top"> </td><td class="memTemplItemRight" valign="bottom"><b>memory_based_step_iterator</b> (const <a class="el" href="g_i_l_0046.html">memory_based_step_iterator</a>< I2 > &it)</td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top">reference </td><td class="memItemRight" valign="bottom"><a class="el" href="g_i_l_0046.html#de1279c4ed222b6efb0867c038765ea1">operator[]</a> (difference_type d) const </td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="2db2a1eeeaff81d48e6c3ae3fb21cdd9"></a><!-- doxytag: member="boost::gil::memory_based_step_iterator::set_step" ref="2db2a1eeeaff81d48e6c3ae3fb21cdd9" args="(std::ptrdiff_t memunit_step)" --> void </td><td class="memItemRight" valign="bottom"><b>set_step</b> (std::ptrdiff_t memunit_step)</td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="2d6722b54419923ecb1282a142fcd494"></a><!-- doxytag: member="boost::gil::memory_based_step_iterator::base" ref="2d6722b54419923ecb1282a142fcd494" args="()" --> x_iterator & </td><td class="memItemRight" valign="bottom"><b>base</b> ()</td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="2d972dcaff90f5726d754dd8613c8095"></a><!-- doxytag: member="boost::gil::memory_based_step_iterator::base" ref="2d972dcaff90f5726d754dd8613c8095" args="() const " --> x_iterator const & </td><td class="memItemRight" valign="bottom"><b>base</b> () const </td></tr> </table> <hr><h2>Member Function Documentation</h2> <a class="anchor" name="de1279c4ed222b6efb0867c038765ea1"></a><!-- doxytag: member="boost::gil::memory_based_step_iterator::operator[]" ref="de1279c4ed222b6efb0867c038765ea1" args="(difference_type d) const " --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">reference operator[] </td> <td>(</td> <td class="paramtype">difference_type </td> <td class="paramname"> <em>d</em> </td> <td> ) </td> <td> const<code> [inline]</code></td> </tr> </table> </div> <div class="memdoc"> <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 </div> </div><p> <hr>The documentation for this class was generated from the following file:<ul> <li><a class="el" href="g_i_l_0259.html">step_iterator.hpp</a></ul> </div> <hr size="1"><address style="text-align: right;"><small>Generated on Sat May 2 13:50:18 2009 for Generic Image Library by <a href="http://www.doxygen.org/index.html"> <img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.6 </small></address> </body> </html>