package overloading;
use warnings;

our $VERSION = '0.02';

my $HINT_NO_AMAGIC = 0x01000000; # see perl.h

require 5.010001;

sub _ops_to_nums {
require overload::numbers;

map { exists $overload::numbers::names{"($_"}
? $overload::numbers::names{"($_"}
: do { require Carp; Carp::croak("'$_' is not a valid overload") }
} @_;
}

sub import {
my ( $class, @ops ) = @_;

if ( @ops ) {
if ( $^H{overloading} ) {
vec($^H{overloading} , $_, 1) = 0 for _ops_to_nums(@ops);
}

if ( $^H{overloading} !~ /[^\0]/ ) {
delete $^H{overloading};
$^H &= ~$HINT_NO_AMAGIC;
}
} else {
delete $^H{overloading};
$^H &= ~$HINT_NO_AMAGIC;
}
}

sub unimport {
my ( $class, @ops ) = @_;

if ( exists $^H{overloading} or not $^H & $HINT_NO_AMAGIC ) {
if ( @ops ) {
vec($^H{overloading} ||= '', $_, 1) = 1 for _ops_to_nums(@ops);
} else {
delete $^H{overloading};
}
}

$^H |= $HINT_NO_AMAGIC;
}

1;
__END__