use Opcode
qw(opmask_add opset invert_opset);
# 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 @_;
opmask_add
(opset
(@_)) if @_;
ops - Perl pragma to restrict unsafe operations when compiling
perl -Mops=:default ... # only allow reasonably safe operations
perl -M-ops=system ... # disable the 'system' opcode
Since the 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.
Opcode(3), Safe(3), perlrun(3)