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<title>Upgrading from the old Boost Iterator Adaptor Library</title>
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<div class="section">
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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<a name="iterator.upgrading"></a><a class="link" href="upgrading.html" title="Upgrading from the old Boost Iterator Adaptor Library">Upgrading from the old Boost Iterator
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Adaptor Library</a>
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</h2></div></div></div>
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<p>
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If you have been using the old Boost Iterator Adaptor library to implement
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iterators, you probably wrote a <code class="computeroutput"><span class="identifier">Policies</span></code>
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class which captures the core operations of your iterator. In the new library
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design, you'll move those same core operations into the body of the iterator
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class itself. If you were writing a family of iterators, you probably wrote
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a <a href="http://www.boost.org/more/generic_programming.html#type_generator" target="_top">type
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generator</a> to build the <code class="computeroutput"><span class="identifier">iterator_adaptor</span></code>
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specialization you needed; in the new library design you don't need a type
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generator (though may want to keep it around as a compatibility aid for older
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code) because, due to the use of the Curiously Recurring Template Pattern (CRTP)
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[Cop95]_, you can now define the iterator class yourself and acquire functionality
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through inheritance from <code class="computeroutput"><span class="identifier">iterator_facade</span></code>
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or <code class="computeroutput"><span class="identifier">iterator_adaptor</span></code>. As a result,
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you also get much finer control over how your iterator works: you can add additional
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constructors, or even override the iterator functionality provided by the library.
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</p>
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<p>
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If you're looking for the old <code class="computeroutput"><span class="identifier">projection_iterator</span></code>
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component, its functionality has been merged into <span class="underline">transform_iterator</span>:
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as long as the function object's <code class="computeroutput"><span class="identifier">result_type</span></code>
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(or the <code class="computeroutput"><span class="identifier">Reference</span></code> template
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argument, if explicitly specified) is a true reference type, <span class="underline">transform_iterator</span>
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will behave like <code class="computeroutput"><span class="identifier">projection_iterator</span></code>
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used to.
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</p>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 2003, 2005 David Abrahams Jeremy Siek Thomas
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Witt<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 <ulink url="http://www.boost.org/LICENSE_1_0.txt">
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http://www.boost.org/LICENSE_1_0.txt </ulink>)
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