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-rw-r--r--lib/fields.pm18
1 files changed, 18 insertions, 0 deletions
diff --git a/lib/fields.pm b/lib/fields.pm
new file mode 100644
index 0000000000..8e2d6398bb
--- /dev/null
+++ b/lib/fields.pm
@@ -0,0 +1,18 @@
+package fields;
+
+sub import {
+ my $class = shift;
+ my ($package) = caller;
+ my $fields = \%{"$package\::FIELDS"};
+ my $i = $fields->{__MAX__};
+ foreach my $f (@_) {
+ if (defined($fields->{$f})) {
+ require Carp;
+ Carp::croak("Field name $f already in use");
+ }
+ $fields->{$f} = ++$i;
+ }
+ $fields->{__MAX__} = $i;
+}
+
+1;