# Copyright 2008 Castle Technology Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
package strict;

sub bits {
    my $bits = 0;
    foreach $sememe (@_) {
	$bits |= 0x00000002 if $sememe eq 'refs';
	$bits |= 0x00000200 if $sememe eq 'subs';
	$bits |= 0x00000400 if $sememe eq 'vars';
    }
    $bits;
}

sub import {
    shift;
    $^H |= bits(@_ ? @_ : qw(refs subs vars));
}

sub unimport {
    shift;
    $^H &= ~ bits(@_ ? @_ : qw(refs subs vars));
}

1;
