package ops;

our $VERSION = '1.02';

use Opcode qw(opmask_add opset invert_opset);

sub import {
shift;
# Not that unimport is the preferred form since import's don't
# accumulate well owing to the 'only ever add opmask' rule.
# E.g., perl -Mops=:set1 -Mops=:setb is unlikely to do as expected.
opmask_add(invert_opset opset(@_)) if @_;
}

sub unimport {
shift;
opmask_add(opset(@_)) if @_;
}

1;

__END__

=head1 NAME

ops - Perl pragma to restrict unsafe operations when compiling

=head1 SYNOPSIS

perl -Mops=:default ... # only allow reasonably safe operations

perl -M-ops=system ... # disable the 'system' opcode

=head1 DESCRIPTION

Since the C<ops> pragma currently has an irreversible global effect, it is
only of significant practical use with the C<-M> option on the command line.

See the L<Opcode> module for information about opcodes, optags, opmasks
and important information about safety.

=head1 SEE ALSO

L<Opcode>, L<Safe>, L<perlrun>

=cut