forked from boostorg/range
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HTML
80 lines
4.9 KiB
HTML
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<link rel="home" href="../../index.html" title="Chapter 1. Range 2.0">
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<div class="section" title="Overview">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="range.concepts.overview"></a><a class="link" href="overview.html" title="Overview">Overview</a>
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</h3></div></div></div>
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<p>
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A Range is a <span class="bold"><strong><span class="emphasis"><em>concept</em></span></strong></span>
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similar to the STL <a href="http://www.sgi.com/Technology/STL/Container.html" target="_top">Container</a>
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concept. A Range provides iterators for accessing a half-open range <code class="computeroutput"><span class="special">[</span><span class="identifier">first</span><span class="special">,</span><span class="identifier">one_past_last</span><span class="special">)</span></code> of elements and provides information about
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the number of elements in the Range. However, a Range has fewer requirements
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than a Container.
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</p>
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<p>
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The motivation for the Range concept is that there are many useful Container-like
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types that do not meet the full requirements of Container, and many algorithms
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that can be written with this reduced set of requirements. In particular,
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a Range does not necessarily
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</p>
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<div class="itemizedlist"><ul class="itemizedlist" type="disc">
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<li class="listitem">
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own the elements that can be accessed through it,
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</li>
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<li class="listitem">
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have copy semantics,
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</li>
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</ul></div>
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<p>
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Because of the second requirement, a Range object must be passed by (const
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or non-const) reference in generic code.
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</p>
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<p>
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The operations that can be performed on a Range is dependent on the <a href="../../../../iterator/doc/new-iter-concepts.html#iterator-traversal-concepts-lib-iterator-traversal" target="_top">traversal
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category</a> of the underlying iterator type. Therefore the range concepts
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are named to reflect which traversal category its iterators support. See
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also terminology and style guidelines. for more information about naming
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of ranges.
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</p>
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<p>
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The concepts described below specifies associated types as <a href="../../../../libs/mpl/doc/refmanual/metafunction.html" target="_top">metafunctions</a>
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and all functions as free-standing functions to allow for a layer of indirection.
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</p>
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</div>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 2003 -2010 Thorsten Ottosen, Neil Groves<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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</p>
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