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24 | </div> | |
25 | <div class="section"> | |
26 | <div class="titlepage"><div><div><h2 class="title" style="clear: both"> | |
27 | <a name="phoenix.lazy_list"></a><a class="link" href="lazy_list.html" title="Lazy List">Lazy List</a> | |
28 | </h2></div></div></div> | |
29 | <div class="toc"><dl> | |
30 | <dt><span class="section"><a href="lazy_list/background.html">Background</a></span></dt> | |
31 | <dt><span class="section"><a href="lazy_list/what_is_provided.html">What is provided</a></span></dt> | |
32 | <dt><span class="section"><a href="lazy_list/tutorial_with_examples.html">Tutorial with | |
33 | examples</a></span></dt> | |
34 | <dd><dl> | |
35 | <dt><span class="section"><a href="lazy_list/tutorial_with_examples/arithmetic_functions.html">Arithmetic | |
36 | functions</a></span></dt> | |
37 | <dt><span class="section"><a href="lazy_list/tutorial_with_examples/list_generation.html">List | |
38 | Generation</a></span></dt> | |
39 | </dl></dd> | |
40 | <dt><span class="section"><a href="lazy_list/exceptions.html">Exceptions</a></span></dt> | |
41 | <dt><span class="section"><a href="lazy_list/implementation_details.html">Implementation | |
42 | Details</a></span></dt> | |
43 | <dt><span class="section"><a href="lazy_list/testing.html">Testing</a></span></dt> | |
44 | <dt><span class="section"><a href="lazy_list/where_next_.html">Where Next?</a></span></dt> | |
45 | </dl></div> | |
46 | <h2> | |
47 | <a name="phoenix.lazy_list.h0"></a> | |
48 | <span><a name="phoenix.lazy_list.summary"></a></span><a class="link" href="lazy_list.html#phoenix.lazy_list.summary">Summary</a> | |
49 | </h2> | |
50 | <p> | |
51 | Phoenix now has a lazy list implementation which is very similar but not identical | |
52 | to the implementation provided by <a href="http://cgi.di.uoa.gr/~smaragd/fc++/" target="_top">FC++</a>. | |
53 | This provides a set of objects defined by list<type>, for example this | |
54 | which defines an empty list of type int. | |
55 | </p> | |
56 | <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> | |
57 | </pre> | |
58 | <p> | |
59 | A list can contain zero or more elements of the same type. It can also be declared | |
60 | using a function returning values of the correct type. Such lists are only | |
61 | evaluated on demand. A set of functions are defined which enable many ways | |
62 | of manipulating and using lists. Examples are provided for the features available. | |
63 | </p> | |
64 | <p> | |
65 | Exceptions are provided to deal with certain cases and these can be turned | |
66 | off if desired. There is a check on the maximum list length which has a default | |
67 | of 1000 which can be changed by the user. | |
68 | </p> | |
69 | <p> | |
70 | This is an extension to Boost Phoenix which does not change the public interface | |
71 | except to define new features in the namespace | |
72 | </p> | |
73 | <pre class="programlisting"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">phoenix</span> | |
74 | </pre> | |
75 | <p> | |
76 | It has to be explicitly included using the header | |
77 | </p> | |
78 | <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> | |
79 | </pre> | |
80 | <h2> | |
81 | <a name="phoenix.lazy_list.h1"></a> | |
82 | <span><a name="phoenix.lazy_list.introduction"></a></span><a class="link" href="lazy_list.html#phoenix.lazy_list.introduction">Introduction</a> | |
83 | </h2> | |
84 | <p> | |
85 | Boost Phoenix provides many features of functional_programming. One of the | |
86 | things which has been missing until now is a lazy list implementation. One | |
87 | is available in the library <a href="http://cgi.di.uoa.gr/~smaragd/fc++/" target="_top">FC++</a> | |
88 | which although not part of Boost has many similarities. It has been possible | |
89 | to reimplement the strategy of the <a href="http://people.cs.umass.edu/~yannis/fc++/New/new_list_implementation.html" target="_top">FC++ | |
90 | List Implementation</a> using the facilties in Phoenix. This provides something | |
91 | which has up until now not been available anywhere in Phoenix and probably | |
92 | not anywhere else in Boost. This new implementation is very well integrated | |
93 | with other features in Phoenix as it uses the same mechanism. In turn that | |
94 | is well integrated with Boost Function. | |
95 | </p> | |
96 | <p> | |
97 | There is a great deal of material in <a href="http://cgi.di.uoa.gr/~smaragd/fc++/" target="_top">FC++</a> | |
98 | and it is not proposed to replicate all of it. A great deal has changed since | |
99 | <a href="http://cgi.di.uoa.gr/~smaragd/fc++/" target="_top">FC++</a> was written and | |
100 | many things are already available in Phoenix or elsewhere. The emphasis here | |
101 | is to add to Phoenix in a way which will make it easier to implement functional_programming. | |
102 | </p> | |
103 | <p> | |
104 | Progress is being made in implementing both the basic list<T> and the | |
105 | functions needed to manipulate lists. | |
106 | </p> | |
107 | </div> | |
108 | <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> | |
109 | <td align="left"></td> | |
110 | <td align="right"><div class="copyright-footer">Copyright © 2002-2005, 2010, 2014, 2015 Joel de Guzman, Dan Marsden, Thomas | |
111 | Heller, John Fletcher<p> | |
112 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
113 | 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>) | |
114 | </p> | |
115 | </div></td> | |
116 | </tr></table> | |
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