Rather than solving the problem of circular dependencies, Sort::Topological just insists you not have any. Take a look at the Graph module, which has a toposort function. That still doesn't solve detection, but it doesn't blow up:
$ perl -MGraph -e'my $g=Graph->new();$g->add_cycle(qw/foo bar baz/);$g
+->add_edge(qw/quux foo/);print $g->toposort()'
quuxbarbazfoo$
You could detect cycles by, for each node, checking if there is a path to any of its predecessors. That will not scale well, but it can be done
Graph nodes can carry weights, which will allow the priority part of your problem. Properly set up, a minimum spanning tree, $G->MST_Kruskal, should give a solution.
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.
|
