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| <Head> |
| <Title>Boost Graph Library: property_writer</Title> |
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| |
| <H1> |
| <pre> |
| property_writer<PropertyMap, OutputIterator, EventTag> |
| </pre> |
| </H1> |
| |
| This is an <a href="./EventVisitor.html">EventVisitor</a> that can be |
| used to output the property of a vertex or edge at some event-point |
| within an algorithm. |
| |
| <p> |
| <tt>property_writer</tt> can be used with graph algorithms by |
| wrapping it with the algorithm-specific adaptor, such as <a |
| href="./bfs_visitor.html"><tt>bfs_visitor</tt></a> and <a |
| href="./dfs_visitor.html"><tt>dfs_visitor</tt></a>. Also, this event |
| visitor can be combined with other event visitors using |
| <tt>std::pair</tt> to form an EventVisitorList. |
| |
| <h3>Example</h3> |
| |
| The following is an excerpt from <a |
| href="../example/dave.cpp"><tt>examples/dave.cpp</tt></a>. |
| |
| <pre> |
| std::ostream_iterator<int> cout_int(std::cout, " "); |
| std::ostream_iterator<char> cout_char(std::cout, " "); |
| |
| boost::breadth_first_search |
| (G, vertex(a, G), make_bfs_visitor( |
| std::make_pair(write_property(name, cout_char, on_discover_vertex()), |
| std::make_pair(write_property(distance.begin(), cout_int, |
| on_discover_vertex()), |
| std::make_pair(print_edge(name, std::cout, on_examine_edge()), |
| print_endl(std::cout, on_finish_vertex() |
| )))))); |
| </pre> |
| |
| <h3>Model of</h3> |
| |
| <a href="./EventVisitor.html">EventVisitor</a> |
| |
| |
| <H3>Where Defined</H3> |
| |
| <P> |
| <a href="../../../boost/graph/visitors.hpp"> |
| <TT>boost/graph/visitors.hpp</TT></a> |
| |
| <H3>Template Parameters</H3> |
| |
| <P> |
| <TABLE border> |
| <TR> |
| <th>Parameter</th><th>Description</th><th>Default</th> |
| </tr> |
| |
| <TR><TD><TT>PropertyMap</TT></TD> |
| <TD> |
| A <a |
| href="../../property_map/doc/ReadablePropertyMap.html">ReadablePropertyMap</a> |
| where the <tt>key_type</tt> is the vertex descriptor type or edge |
| descriptor of the graph (depending on the kind of event tag) and |
| the <tt>value_type</tt> of the property is convertible |
| to the <tt>value_type</tt> of the <tt>OutputIterator</tt>. |
| </TD> |
| <TD> </TD> |
| </TR> |
| |
| <TR><TD><TT>OutputIterator</TT></TD> |
| <TD> |
| The iterator type used to write out the property values, which must be |
| a model of <a |
| href="http://www.sgi.com/tech/stl/OutputIterator.html">OutputIterator</a>. |
| </TD> |
| <TD> </TD> |
| </TR> |
| |
| |
| <TR><TD><TT>EventTag</TT></TD> |
| <TD> |
| The tag to specify when the <tt>property_writer</tt> should be |
| applied during the graph algorithm. |
| </TD> |
| <TD> </TD> |
| </TR> |
| |
| </table> |
| |
| <H2>Associated Types</H2> |
| |
| <table border> |
| |
| <tr> |
| <th>Type</th><th>Description</th> |
| </tr> |
| |
| <tr> |
| <td><tt>property_writer::event_filter</tt></td> |
| <td> |
| This will be the same type as the template parameter <tt>EventTag</tt>. |
| </td> |
| </tr> |
| |
| </table> |
| |
| <h3>Member Functions</h3> |
| |
| <p> |
| |
| <table border> |
| <tr> |
| <th>Member</th><th>Description</th> |
| </tr> |
| |
| <tr> |
| <td><tt> |
| property_writer(PropertyMap pa, OutputIterator out); |
| </tt></td> |
| <td> |
| Construct a property writer object with the property map |
| <tt>pa</tt> and output iterator <tt>out</tt>. |
| </td> |
| </tr> |
| |
| <tr> |
| <td><tt> |
| template <class X, class Graph><br> |
| void operator()(X x, const Graph& g); |
| </tt></td> |
| <td> |
| This writes the property value for <tt>x</tt> to the output iterator.<br> |
| <tt>*out++ = get(pa, x);</tt> |
| </td> |
| </tr> |
| |
| </table> |
| |
| <h3>Non-Member Functions</h3> |
| |
| <table border> |
| <tr> |
| <th>Function</th><th>Description</th> |
| </tr> |
| |
| <tr><td><tt> |
| template <class PropertyMap, class OutputIterator, class Tag><br> |
| property_writer<PropertyMap, OutputIterator, Tag><br> |
| write_property(PropertyMap pa, OutputIterator out, Tag); |
| </tt></td><td> |
| A convenient way to create a <tt>property_writer</tt>. |
| </td></tr> |
| |
| </table> |
| |
| <h3>See Also</h3> |
| |
| <a href="./visitor_concepts.html">Visitor concepts</a> |
| <p> |
| The following are other event visitors: <a |
| <a href="./distance_recorder.html"><tt>distance_recorder</tt></a>, |
| <a href="./predecessor_recorder.html"><tt>predecessor_recorder</tt></a>, |
| and <a href="./time_stamper.html"><tt>time_stamper</tt></a>. |
| |
| |
| <br> |
| <HR> |
| <TABLE> |
| <TR valign=top> |
| <TD nowrap>Copyright © 2000-2001</TD><TD> |
| <A HREF="http://www.boost.org/people/jeremy_siek.htm">Jeremy Siek</A>, |
| Indiana University (<A |
| HREF="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</A>)<br> |
| <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> |
| <A HREF="http://www.osl.iu.edu/~lums">Andrew Lumsdaine</A>, |
| Indiana University (<A |
| HREF="mailto:lums@osl.iu.edu">lums@osl.iu.edu</A>) |
| </TD></TR></TABLE> |
| |
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