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18<h1><a class="toc-backref" href="./sequences.html#id352" name="intrinsic-metafunctions">Intrinsic Metafunctions</a></h1>
19<a class="target" id="label-sequences-intrinsic" name="label-sequences-intrinsic"></a><p>The metafunctions that form the essential interface of sequence <a class="reference" href="./classes.html#label-sequences-classes">classes</a>
20documented in the corresponding <a class="reference" href="./concepts.html#label-sequences-concepts">sequence concepts</a> are known as
21<em>intrinsic sequence operations</em>. They differ from generic
22<a class="reference" href="./algorithms.html">sequence algorithms</a> in that, in general, they need to be implemented
23from scratch for each new sequence class <a class="footnote-reference" href="#intrinsic" id="id48" name="id48">[1]</a>.</p>
24<p>It's worth noting that STL counterparts of these metafunctions are
25usually implemented as member functions.</p>
26<table class="footnote" frame="void" id="intrinsic" rules="none">
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29<tr><td class="label"><a class="fn-backref" href="#id48" name="intrinsic">[1]</a></td><td>In practice, many of intrinsic metafunctions offer a
30default implementation that will work in majority of cases, given
31that you've implemented the core functionality they rely on (such
32as <a class="refentry reference" href="./begin.html"><tt class="refentry literal"><span class="pre">begin</span></tt></a> / <a class="refentry reference" href="./end.html"><tt class="refentry literal"><span class="pre">end</span></tt></a>).</td></tr>
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