I'm probably opening up a whole new can of worms here, but if we said that the
following were both vector operators:
^ == intersection operator
v == union operator
then these could have potentially useful meanings on their *own* as set
operators, as well as modifying other operators. For example:
@a = (1,2,3);
@b = (4,1,3);
@a = @a ^ @b; # @a = (1,3);
@a = @a v @b; # @a = (1,2,3,4);
ie @a = @a ^ @b; means
grep($MARK{$_}++, @a);
for @b { push (@result, $_) if ($MARK{$_} && !$MARK2{$_}++); }
@a = @result;
----
@a = @a v @b; means
grep( $MARK{$_}++, @a );
@result= @a;
for @b { push (@result, $_) if (!$MARK{$_}++) }
----
I know that this is far more useful behavior than the currently proposed meaning
of @a ^= @b... even though if its a little off kilter with the other meanings:
@a = (1,2,3);
@b = (4,1,3,5);
@a ^+= @b; # (5,3,6);
@a v+= @b; # (5,3,6,5);
etc. etc.
Ed
