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Instead of calling base's operators ++, --, +=, -=, etc. the adaptor is using the passed policy object SFn for advancing and for computing the distance between iterators. <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="3a1b6e89f2ea9e66e64e9a5da22eff92"></a><!-- doxytag: member="boost::gil::detail::step_iterator_adaptor::parent_t" ref="3a1b6e89f2ea9e66e64e9a5da22eff92" args="" --> typedef iterator_adaptor<br> < Derived, Iterator, <br> use_default, use_default, <br> use_default, typename <br> SFn::difference_type > </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="38347e2b83516d4bf62701822467f4f4"></a><!-- doxytag: member="boost::gil::detail::step_iterator_adaptor::base_difference_type" ref="38347e2b83516d4bf62701822467f4f4" args="" --> typedef std::iterator_traits<br> < Iterator >::difference_type </td><td class="memItemRight" valign="bottom"><b>base_difference_type</b></td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="8fec1ab787cf74a2f23fc3b701e4e88c"></a><!-- doxytag: member="boost::gil::detail::step_iterator_adaptor::difference_type" ref="8fec1ab787cf74a2f23fc3b701e4e88c" args="" --> typedef SFn::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="258697e71d2606a00621f14fd7f2c5d7"></a><!-- doxytag: member="boost::gil::detail::step_iterator_adaptor::reference" ref="258697e71d2606a00621f14fd7f2c5d7" args="" --> typedef std::iterator_traits<br> < Iterator >::reference </td><td class="memItemRight" valign="bottom"><b>reference</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="15fe6eaea1e52b8f3d3e18c8abf8ada9"></a><!-- doxytag: member="boost::gil::detail::step_iterator_adaptor::step_iterator_adaptor" ref="15fe6eaea1e52b8f3d3e18c8abf8ada9" args="(const Iterator &it, SFn step_fn=SFn())" --> </td><td class="memItemRight" valign="bottom"><b>step_iterator_adaptor</b> (const Iterator &it, SFn step_fn=SFn())</td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="4d9de021528d2fae8de7b71dbc2e3909"></a><!-- doxytag: member="boost::gil::detail::step_iterator_adaptor::step" ref="4d9de021528d2fae8de7b71dbc2e3909" args="() const " --> difference_type </td><td class="memItemRight" valign="bottom"><b>step</b> () const </td></tr> <tr><td colspan="2"><br><h2>Protected Attributes</h2></td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="a6f3d4cf659c02cbee3b014d8d9dc90c"></a><!-- doxytag: member="boost::gil::detail::step_iterator_adaptor::_step_fn" ref="a6f3d4cf659c02cbee3b014d8d9dc90c" args="" --> SFn </td><td class="memItemRight" valign="bottom"><b>_step_fn</b></td></tr> <tr><td colspan="2"><br><h2>Friends</h2></td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="c09f73e325921cc50ebcd96bed0f8096"></a><!-- doxytag: member="boost::gil::detail::step_iterator_adaptor::boost::iterator_core_access" ref="c09f73e325921cc50ebcd96bed0f8096" args="" --> class </td><td class="memItemRight" valign="bottom"><b>boost::iterator_core_access</b></td></tr> </table> <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>