Front page | perl.perl5.porters |
Postings from April 2007
On 02/04/07, Gerard Goossen <gerard@tty.nl> wrote: > I find the whole 'state $x' effecting the rhs is very tricky. > And having this magic in sassign seems wrong. It means that > '(state $x) = "foo"' assigns "foo" to $x every time. That's by design. Or else, what should (state $x, my $y) = f() do ? > And also 'state $x ||= "foo"' works every time. > If the magic remains I think it should be done by > 'state $x' returning an LVALUE with "get" and "set" magic. > But I think it is much simpler that 'state $x' always returns the > state variable $x, that is just a declaration. That would be much simpler, yes. Less surprising, too. I might back out all changes to sassign before 5.10. Still wondering. > If you want to initialize it only once you can do 'state $x //= "foo"' > It is immediatly clear that $x will keeps it old value, and "foo" is > only evaluated if $x is uninitialized. But that's a different semantics, since you can then undef $x and have the assignment occur again. What we would like to have here is ONCE blocks, actually. But I don't see how to do this without a modifiable optree (even with indirections).Thread Previous | Thread Next