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| 17 | <div class="section" id="sequences"> |
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| 18 | <h1><a class="toc-backref" href="../refmanual.html#id322" name="sequences">Sequences</a></h1> |
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| 19 | <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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| 20 | template metaprogramming. Differences in types of objects being |
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| 21 | manipulated is the most common point of variability of similar, but |
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| 22 | not identical designs, and these are a direct target for |
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| 23 | metaprogramming. Templates were originally designed to address this |
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| 24 | exact problem. However, without predefined mechanisms for |
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| 25 | representing and manipulating <em>sequences</em> of types as opposed to |
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| 26 | standalone template parameters, high-level template metaprogramming |
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| 27 | is severely limited in its capabitilies.</p> |
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| 28 | <p>The MPL recognizes the importance of type sequences as a fundamental |
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| 29 | building block of many higher-level metaprogramming designs by |
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| 30 | providing us with a conceptual framework for formal reasoning |
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| 31 | and understanding of sequence properties, guarantees and |
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| 32 | characteristics, as well as a first-class implementation of that |
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| 33 | framework — a wealth of tools for concise, convenient, |
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| 34 | conceptually precise and efficient sequence manipulation.</p> |
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