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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.
6 (See accompanying file LICENSE_1_0.txt or copy at
7 http://www.boost.org/LICENSE_1_0.txt)
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9<Head>
10<Title>Boost Graph Library: time_stamper</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">
15
16<BR Clear>
17
18<H1>
19<pre>
20time_stamper&lt;TimeMap, TimeT, EventTag&gt;
21</pre>
22</H1>
23
24This is an <a href="./EventVisitor.html">EventVisitor</a> that can be
25used to &quot;stamp&quot; a time at some event-point within an
26algorithm. An example of this is recording the discover or finish time
27of a vertex during a graph search.
28
29<p>
30<tt>time_stamper</tt> can be used with graph algorithms by
31wrapping it with the algorithm specific adaptor, such as <a
32href="./bfs_visitor.html"><tt>bfs_visitor</tt></a> and <a
33href="./dfs_visitor.html"><tt>dfs_visitor</tt></a>. Also, this event
34visitor can be combined with other event visitors using
35<tt>std::pair</tt> to form an EventVisitorList.
36
37<h3>Example</h3>
38
39The following example shows the usage of the <tt>time_stamper</tt>.
40
41
42<pre>
43 std::vector<default_color_type> color(num_vertices(G));
44 std::vector<size_type> dtime(num_vertices(G));
45 std::vector<size_type> ftime(num_vertices(G));
46
47 int time = 0;
48 boost::breadth_first_search
49 (G, vertex(s, G), make_bfs_visitor(
50 std::make_pair(stamp_times(dtime.begin(), time, on_discover_vertex()),
51 stamp_times(ftime.begin(), time, on_finish_vertex()))),
52 color.begin());
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>TimeMap</TT></TD>
75<TD>
76A <a
77href="../../property_map/doc/WritablePropertyMap.html">WritablePropertyMap</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
80where the <tt>TimeT</tt> type is convertible to the
81<tt>value_type</tt> of the time property map.
82</TD>
83<TD>&nbsp;</TD>
84</TR>
85
86<TR><TD><TT>TimeT</TT></TD>
87<TD>
88The type for the time counter which should be convertible to the
89<tt>value_type</tt> of the time property map
90</TD>
91<TD>&nbsp;</TD>
92</TR>
93
94
95<TR><TD><TT>EventTag</TT></TD>
96<TD>
97The tag to specify when the <tt>time_stamper</tt> should be
98applied during the graph algorithm.
99</TD>
100<TD>&nbsp;</TD>
101</TR>
102
103</table>
104
105<H2>Associated Types</H2>
106
107<table border>
108
109<tr>
110<th>Type</th><th>Description</th>
111</tr>
112
113<tr>
114<td><tt>time_stamper::event_filter</tt></td>
115<td>
116This will be the same type as the template parameter <tt>EventTag</tt>.
117</td>
118</tr>
119
120</table>
121
122<h3>Member Functions</h3>
123
124<p>
125
126<table border>
127<tr>
128<th>Member</th><th>Description</th>
129</tr>
130
131<tr>
132<td><tt>
133time_stamper(TimeMap time_pa, TimeT& t);
134</tt></td>
135<td>
136Construct a time stamper object with time property map
137<tt>time_pa</tt> and time counter <tt>t</tt>.
138</td>
139</tr>
140
141<tr>
142<td><tt>
143template &lt;class X, class Graph&gt;<br>
144void operator()(X x, const Graph& g);
145</tt></td>
146<td>
147This increments the time count and &quot;stamps&quot; the time:<br>
148<tt>put(time_pa, x, ++t);</tt>
149</td>
150</tr>
151
152</table>
153
154<h3>Non-Member Functions</h3>
155
156<table border>
157<tr>
158<th>Function</th><th>Description</th>
159</tr>
160
161<tr><td><tt>
162template &lt;class TimeMap, class TimeT, class Tag&gt;<br>
163time_stamper&lt;TimeMap, TimeT, Tag&gt;<br>
164stamp_times(TimeMap pa, TimeT& t, Tag);
165</tt></td><td>
166A convenient way to create a <tt>time_stamper</tt>.
167</td></tr>
168
169</table>
170
171<h3>See Also</h3>
172
173<a href="./visitor_concepts.html">Visitor concepts</a>
174<p>
175The following are other event visitors: <a
176<a href="./distance_recorder.html"><tt>distance_recorder</tt></a>,
177<a href="./time_stamper.html"><tt>time_stamper</tt></a>,
178and <a href="./property_writer.html"><tt>property_writer</tt></a>.
179
180
181<br>
182<HR>
183<TABLE>
184<TR valign=top>
185<TD nowrap>Copyright &copy; 2000-2001</TD><TD>
186<A HREF="http://www.boost.org/people/jeremy_siek.htm">Jeremy Siek</A>,
187Indiana University (<A
188HREF="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</A>)<br>
189<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>
190<A HREF="http://www.osl.iu.edu/~lums">Andrew Lumsdaine</A>,
191Indiana University (<A
192HREF="mailto:lums@osl.iu.edu">lums@osl.iu.edu</A>)
193</TD></TR></TABLE>
194
195</BODY>
196</HTML>
197<!-- LocalWords: TimeMap TimeT EventTag EventVisitor bfs dfs EventVisitorList
198 -->
199<!-- LocalWords: cpp num dtime ftime int WritablePropertyMap map
200 -->
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202 -->
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