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| <div class="titlepage"><div><div><h2 class="title" style="clear: both"> |
| <a name="phoenix.lazy_list"></a><a class="link" href="lazy_list.html" title="Lazy List">Lazy List</a> |
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| <div class="toc"><dl class="toc"> |
| <dt><span class="section"><a href="lazy_list/background.html">Background</a></span></dt> |
| <dt><span class="section"><a href="lazy_list/what_is_provided.html">What is provided</a></span></dt> |
| <dt><span class="section"><a href="lazy_list/tutorial_with_examples.html">Tutorial with |
| examples</a></span></dt> |
| <dd><dl> |
| <dt><span class="section"><a href="lazy_list/tutorial_with_examples/arithmetic_functions.html">Arithmetic |
| functions</a></span></dt> |
| <dt><span class="section"><a href="lazy_list/tutorial_with_examples/list_generation.html">List |
| Generation</a></span></dt> |
| </dl></dd> |
| <dt><span class="section"><a href="lazy_list/exceptions.html">Exceptions</a></span></dt> |
| <dt><span class="section"><a href="lazy_list/implementation_details.html">Implementation |
| Details</a></span></dt> |
| <dt><span class="section"><a href="lazy_list/testing.html">Testing</a></span></dt> |
| <dt><span class="section"><a href="lazy_list/where_next_.html">Where Next?</a></span></dt> |
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| <h2> |
| <a name="phoenix.lazy_list.h0"></a> |
| <span class="phrase"><a name="phoenix.lazy_list.summary"></a></span><a class="link" href="lazy_list.html#phoenix.lazy_list.summary">Summary</a> |
| </h2> |
| <p> |
| Phoenix now has a lazy list implementation which is very similar but not identical |
| to the implementation provided by <a href="http://cgi.di.uoa.gr/~smaragd/fc++/" target="_top">FC++</a>. |
| This provides a set of objects defined by list<type>, for example this |
| which defines an empty list of type int. |
| </p> |
| <pre class="programlisting"><span class="identifier">list</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">example</span><span class="special">;</span> |
| </pre> |
| <p> |
| A list can contain zero or more elements of the same type. It can also be declared |
| using a function returning values of the correct type. Such lists are only |
| evaluated on demand. A set of functions are defined which enable many ways |
| of manipulating and using lists. Examples are provided for the features available. |
| </p> |
| <p> |
| Exceptions are provided to deal with certain cases and these can be turned |
| off if desired. There is a check on the maximum list length which has a default |
| of 1000 which can be changed by the user. |
| </p> |
| <p> |
| This is an extension to Boost Phoenix which does not change the public interface |
| except to define new features in the namespace |
| </p> |
| <pre class="programlisting"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">phoenix</span> |
| </pre> |
| <p> |
| It has to be explicitly included using the header |
| </p> |
| <pre class="programlisting"><span class="identifier">boost</span><span class="special">/</span><span class="identifier">phoenix</span><span class="special">/</span><span class="identifier">function</span><span class="special">/</span><span class="identifier">lazy_prelude</span><span class="special">.</span><span class="identifier">hpp</span> |
| </pre> |
| <h2> |
| <a name="phoenix.lazy_list.h1"></a> |
| <span class="phrase"><a name="phoenix.lazy_list.introduction"></a></span><a class="link" href="lazy_list.html#phoenix.lazy_list.introduction">Introduction</a> |
| </h2> |
| <p> |
| Boost Phoenix provides many features of functional_programming. One of the |
| things which has been missing until now is a lazy list implementation. One |
| is available in the library <a href="http://cgi.di.uoa.gr/~smaragd/fc++/" target="_top">FC++</a> |
| which although not part of Boost has many similarities. It has been possible |
| to reimplement the strategy of the <a href="http://people.cs.umass.edu/~yannis/fc++/New/new_list_implementation.html" target="_top">FC++ |
| List Implementation</a> using the facilties in Phoenix. This provides something |
| which has up until now not been available anywhere in Phoenix and probably |
| not anywhere else in Boost. This new implementation is very well integrated |
| with other features in Phoenix as it uses the same mechanism. In turn that |
| is well integrated with Boost Function. |
| </p> |
| <p> |
| There is a great deal of material in <a href="http://cgi.di.uoa.gr/~smaragd/fc++/" target="_top">FC++</a> |
| and it is not proposed to replicate all of it. A great deal has changed since |
| <a href="http://cgi.di.uoa.gr/~smaragd/fc++/" target="_top">FC++</a> was written and |
| many things are already available in Phoenix or elsewhere. The emphasis here |
| is to add to Phoenix in a way which will make it easier to implement functional_programming. |
| </p> |
| <p> |
| Progress is being made in implementing both the basic list<T> and the |
| functions needed to manipulate lists. |
| </p> |
| </div> |
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| <td align="right"><div class="copyright-footer">Copyright © 2002-2005, 2010, 2014, 2015 Joel de Guzman, Dan Marsden, Thomas |
| Heller, John Fletcher<p> |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| 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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