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3 Copyright (c) Jeremy Siek, Lie-Quan Lee, and Andrew Lumsdaine 2000
4
5 Distributed under the Boost Software License, Version 1.0.
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9<Head>
10<Title>Boost Graph Library: property_writer</Title>
11<BODY BGCOLOR="#ffffff" LINK="#0000ee" TEXT="#000000" VLINK="#551a8b"
12 ALINK="#ff0000">
13<IMG SRC="../../../boost.png"
14 ALT="C++ Boost" width="277" height="86">
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16<BR Clear>
17
18<H1>
19<pre>
20property_writer&lt;PropertyMap, OutputIterator, EventTag&gt;
21</pre>
22</H1>
23
24This is an <a href="./EventVisitor.html">EventVisitor</a> that can be
25used to output the property of a vertex or edge at some event-point
26within an algorithm.
27
28<p>
29<tt>property_writer</tt> can be used with graph algorithms by
30wrapping it with the algorithm-specific adaptor, such as <a
31href="./bfs_visitor.html"><tt>bfs_visitor</tt></a> and <a
32href="./dfs_visitor.html"><tt>dfs_visitor</tt></a>. Also, this event
33visitor can be combined with other event visitors using
34<tt>std::pair</tt> to form an EventVisitorList.
35
36<h3>Example</h3>
37
38The following is an excerpt from <a
39href="../example/dave.cpp"><tt>examples/dave.cpp</tt></a>.
40
41<pre>
42 std::ostream_iterator<int> cout_int(std::cout, " ");
43 std::ostream_iterator<char> cout_char(std::cout, " ");
44
45 boost::breadth_first_search
46 (G, vertex(a, G), make_bfs_visitor(
47 std::make_pair(write_property(name, cout_char, on_discover_vertex()),
48 std::make_pair(write_property(distance.begin(), cout_int,
49 on_discover_vertex()),
50 std::make_pair(print_edge(name, std::cout, on_examine_edge()),
51 print_endl(std::cout, on_finish_vertex()
52 ))))));
53</pre>
54
55<h3>Model of</h3>
56
57<a href="./EventVisitor.html">EventVisitor</a>
58
59
60<H3>Where Defined</H3>
61
62<P>
63<a href="../../../boost/graph/visitors.hpp">
64<TT>boost/graph/visitors.hpp</TT></a>
65
66<H3>Template Parameters</H3>
67
68<P>
69<TABLE border>
70<TR>
71<th>Parameter</th><th>Description</th><th>Default</th>
72</tr>
73
74<TR><TD><TT>PropertyMap</TT></TD>
75<TD>
76A <a
77href="../../property_map/doc/ReadablePropertyMap.html">ReadablePropertyMap</a>
78where the <tt>key_type</tt> is the vertex descriptor type or edge
79descriptor of the graph (depending on the kind of event tag) and
80the <tt>value_type</tt> of the property is convertible
81to the <tt>value_type</tt> of the <tt>OutputIterator</tt>.
82</TD>
83<TD>&nbsp;</TD>
84</TR>
85
86<TR><TD><TT>OutputIterator</TT></TD>
87<TD>
88The iterator type used to write out the property values, which must be
89a model of <a
90href="http://www.sgi.com/tech/stl/OutputIterator.html">OutputIterator</a>.
91</TD>
92<TD>&nbsp;</TD>
93</TR>
94
95
96<TR><TD><TT>EventTag</TT></TD>
97<TD>
98The tag to specify when the <tt>property_writer</tt> should be
99applied during the graph algorithm.
100</TD>
101<TD>&nbsp;</TD>
102</TR>
103
104</table>
105
106<H2>Associated Types</H2>
107
108<table border>
109
110<tr>
111<th>Type</th><th>Description</th>
112</tr>
113
114<tr>
115<td><tt>property_writer::event_filter</tt></td>
116<td>
117This will be the same type as the template parameter <tt>EventTag</tt>.
118</td>
119</tr>
120
121</table>
122
123<h3>Member Functions</h3>
124
125<p>
126
127<table border>
128<tr>
129<th>Member</th><th>Description</th>
130</tr>
131
132<tr>
133<td><tt>
134property_writer(PropertyMap pa, OutputIterator out);
135</tt></td>
136<td>
137Construct a property writer object with the property map
138<tt>pa</tt> and output iterator <tt>out</tt>.
139</td>
140</tr>
141
142<tr>
143<td><tt>
144template &lt;class X, class Graph&gt;<br>
145void operator()(X x, const Graph& g);
146</tt></td>
147<td>
148This writes the property value for <tt>x</tt> to the output iterator.<br>
149<tt>*out++ = get(pa, x);</tt>
150</td>
151</tr>
152
153</table>
154
155<h3>Non-Member Functions</h3>
156
157<table border>
158<tr>
159<th>Function</th><th>Description</th>
160</tr>
161
162<tr><td><tt>
163template &lt;class PropertyMap, class OutputIterator, class Tag&gt;<br>
164property_writer&lt;PropertyMap, OutputIterator, Tag&gt;<br>
165write_property(PropertyMap pa, OutputIterator out, Tag);
166</tt></td><td>
167A convenient way to create a <tt>property_writer</tt>.
168</td></tr>
169
170</table>
171
172<h3>See Also</h3>
173
174<a href="./visitor_concepts.html">Visitor concepts</a>
175<p>
176The following are other event visitors: <a
177<a href="./distance_recorder.html"><tt>distance_recorder</tt></a>,
178<a href="./predecessor_recorder.html"><tt>predecessor_recorder</tt></a>,
179and <a href="./time_stamper.html"><tt>time_stamper</tt></a>.
180
181
182<br>
183<HR>
184<TABLE>
185<TR valign=top>
186<TD nowrap>Copyright &copy; 2000-2001</TD><TD>
187<A HREF="http://www.boost.org/people/jeremy_siek.htm">Jeremy Siek</A>,
188Indiana University (<A
189HREF="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</A>)<br>
190<A HREF="http://www.boost.org/people/liequan_lee.htm">Lie-Quan Lee</A>, Indiana University (<A HREF="mailto:llee@cs.indiana.edu">llee@cs.indiana.edu</A>)<br>
191<A HREF="http://www.osl.iu.edu/~lums">Andrew Lumsdaine</A>,
192Indiana University (<A
193HREF="mailto:lums@osl.iu.edu">lums@osl.iu.edu</A>)
194</TD></TR></TABLE>
195
196</BODY>
197</HTML>
198<!-- LocalWords: PropertyMap OutputIterator EventTag EventVisitor bfs dfs EventVisitorList
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200<!-- LocalWords: cpp num dtime ftime int WritablePropertyMap map
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