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package Graph::Directed;
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use strict;
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local $^W = 1;
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use Graph::Base;
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use vars qw(@ISA);
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@ISA = qw(Graph::Base);
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sub new
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{
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my $class = shift;
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my $G = Graph::Base->new(@_);
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bless $G, $class;
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$G->directed(1);
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return $G;
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}
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sub _edges
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{
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my ($G, $u, $v) = @_;
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my @e;
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if (defined $u and defined $v)
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{
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@e = ($u, $v)
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if exists $G->{ Succ }->{ $u }->{ $v };
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}
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elsif (defined $u)
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{
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foreach $v ($G->successors($u))
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{
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push @e, $G->_edges($u, $v);
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}
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}
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elsif (defined $v)
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{ # not defined $u and defined $v
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foreach $u ($G->predecessors($v))
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{
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push @e, $G->_edges($u, $v);
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}
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}
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else
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{ # not defined $u and not defined $v
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foreach $u ($G->vertices)
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{
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push @e, $G->_edges($u);
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}
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}
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return @e;
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}
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1;
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