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| 7 | <title>The MPL Reference Manual: Algorithms</title> |
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| 14 | <div class="section" id="algorithms"> |
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| 15 | <h1><a class="toc-backref" href="../refmanual.html#id388" name="algorithms">Algorithms</a></h1> |
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| 16 | <a class="target" id="label-algorithms" name="label-algorithms"></a><p>The MPL provides a broad range of fundamental algorithms aimed to |
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| 17 | satisfy the majority of sequential compile-time data processing |
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| 18 | needs. The algorithms include compile-time counterparts |
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| 19 | of many of the STL algorithms, iteration algorithms borrowed from |
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| 20 | functional programming languages, and more.</p> |
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| 21 | <p>Unlike the algorithms in the C++ Standard Library, which operate on |
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| 22 | implict <em>iterator ranges</em>, the majority of MPL counterparts take |
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| 23 | and return <em>sequences</em>. This derivation is not dictated by the |
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| 24 | functional nature of C++ compile-time computations per se, but |
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| 25 | rather by a desire to improve general usability of the library, |
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| 26 | making programming with compile-time data structures as enjoyable |
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| 27 | as possible.</p> |
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| 28 | <!-- This can be seen as a further generalization and extension of |
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| 29 | the STL's conceptual framework. --> |
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| 30 | <p>In the spirit of the STL, MPL algorithms are <em>generic</em>, meaning |
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| 31 | that they are not tied to particular sequence class |
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| 32 | implementations, and can operate on a wide range of arguments as |
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| 33 | long as they satisfy the documented requirements. The requirements |
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| 34 | are formulated in terms of concepts. Under the hood, |
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| 35 | algorithms are decoupled from concrete sequence |
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| 36 | implementations by operating on <a class="reference" href="./iterators.html">Iterators</a>.</p> |
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| 37 | <p>All MPL algorithms can be sorted into three |
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| 38 | major categories: iteration algorithms, querying algorithms, and |
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| 39 | transformation algorithms. The transformation algorithms introduce |
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| 40 | an associated <a class="reference" href="./inserter.html">Inserter</a> concept, a rough equivalent for the notion of |
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| 41 | <a class="reference" href="http://www.sgi.com/tech/stl/OutputIterator.html" target="_top">Output Iterator</a> in the Standard Library. Moreover, every |
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| 42 | transformation algorithm provides a <tt class="literal"><span class="pre">reverse_</span></tt> counterpart, |
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| 43 | allowing for a wider range of efficient transformations — a |
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| 44 | common functionality documented by the <a class="reference" href="./reversible-algorithm.html">Reversible Algorithm</a> |
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| 45 | concept.</p> |
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| 46 | <!-- modtime: November 08, 2004 10:32:25 +0000 --> |
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| 47 | <ul class="toc simple" id="outline"> |
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| 48 | <li><a class="reference" href="./algorithms-concepts.html" id="id389" name="id389">Concepts</a></li> |
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| 49 | <li><a class="reference" href="./inserters.html" id="id392" name="id392">Inserters</a></li> |
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| 50 | <li><a class="reference" href="./iteration-algorithms.html" id="id396" name="id396">Iteration Algorithms</a></li> |
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| 51 | <li><a class="reference" href="./querying-algorithms.html" id="id402" name="id402">Querying Algorithms</a></li> |
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| 52 | <li><a class="reference" href="./transformation-algorithms.html" id="id413" name="id413">Transformation Algorithms</a></li> |
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| 53 | </ul> |
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| 54 | </div> |
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