diff options
| -rw-r--r-- | lib/Graph/Implicit.pm | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/Graph/Implicit.pm b/lib/Graph/Implicit.pm index 7310cd5..bab96f3 100644 --- a/lib/Graph/Implicit.pm +++ b/lib/Graph/Implicit.pm @@ -107,7 +107,7 @@ sub _traversal { while ($notempty->($bag)) { my ($pred, $vertex) = @{ $remove->($bag) }; if (not exists $marked{$vertex}) { - $code->($pred, $vertex); + $code->($pred, $vertex) if $code; $pred{$vertex} = $pred if defined wantarray; $marked{$vertex} = 1; $insert->($bag, [$vertex, $$_[0]], $$_[1]) for $self->($vertex); |