60 lines
4.8 KiB
HTML
60 lines
4.8 KiB
HTML
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<title>THE BOOST MPL LIBRARY: Iterator Protocol</title>
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<div class="section" id="iterator-protocol">
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<h1><a class="toc-backref" href="./changes-in-boost-1-32-0.html#id65" name="iterator-protocol">Iterator Protocol</a></h1>
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<p>The library no longer guarantees or relies on the direct presence
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of <tt class="literal"><span class="pre">advance</span></tt> / <tt class="literal"><span class="pre">distance</span></tt> / <tt class="literal"><span class="pre">next</span></tt> / <tt class="literal"><span class="pre">prior</span></tt> / <tt class="literal"><span class="pre">type</span></tt>
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members in iterator types; the following table summarises the new
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requirements:</p>
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<col width="50%" />
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<thead valign="bottom">
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<tr><th>Before</th>
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<th>Now</th>
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</thead>
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<tbody valign="top">
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<tr><td><tt class="literal"><span class="pre">i::type</span></tt></td>
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<td><tt class="literal"><span class="pre">deref<i>::type</span></tt></td>
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</tr>
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<tr><td><tt class="literal"><span class="pre">i::next</span></tt></td>
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<td><tt class="literal"><span class="pre">next<i>::type</span></tt></td>
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</tr>
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<tr><td><tt class="literal"><span class="pre">i::prior</span></tt></td>
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<td><tt class="literal"><span class="pre">prior<i>::type</span></tt></td>
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</tr>
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<tr><td><tt class="literal"><span class="pre">i::advance<n>::type</span></tt></td>
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<td><tt class="literal"><span class="pre">advance<i,n>::type</span></tt></td>
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</tr>
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<tr><td><tt class="literal"><span class="pre">i::distance<j>::type</span></tt></td>
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<td><tt class="literal"><span class="pre">distance<i,j>::type</span></tt></td>
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<tr><td><tt class="literal"><span class="pre">i::category</span></tt></td>
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