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48 lines
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<div class="section" id="sequences">
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<h1><a class="toc-backref" href="../refmanual.html#id322" name="sequences">Sequences</a></h1>
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<a class="target" id="label-sequences" name="label-sequences"></a><p>Compile-time sequences of types are one of the basic concepts of C++
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template metaprogramming. Differences in types of objects being
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manipulated is the most common point of variability of similar, but
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not identical designs, and these are a direct target for
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metaprogramming. Templates were originally designed to address this
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exact problem. However, without predefined mechanisms for
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representing and manipulating <em>sequences</em> of types as opposed to
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standalone template parameters, high-level template metaprogramming
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is severely limited in its capabitilies.</p>
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<p>The MPL recognizes the importance of type sequences as a fundamental
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building block of many higher-level metaprogramming designs by
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providing us with a conceptual framework for formal reasoning
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and understanding of sequence properties, guarantees and
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characteristics, as well as a first-class implementation of that
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framework — a wealth of tools for concise, convenient,
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conceptually precise and efficient sequence manipulation.</p>
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