Em Sex, 2009-01-02 às 08:34 -0300, Daniel Ruoso escreveu:
> token routine_def:<coro> {...}
Actually, I was just looking at STD, and the correct token would be
token routine_declarator:coro { <sym> <routine_def> }
I was also looking at the spec files, and I realized that DRAFT S17
mentions coroutines, but its definition is a bit different then the one
I suggested, and the example poses a good reason:
coro dbl { yield $_ * 2; yield $_; };
(1..4).map:{ dbl($_) }
# should result in 2 2 6 4
This example suggests that it will not install an alias in the caller
scope, but the code object itself stores its state.
The other difference is that falling out of a coro makes it restart
immediatly without returning any value (this one is a bit weird, I'd
expect it to return the last statement on the routine as well).
But one way or another yield (yes, I wrote it wrong in the previous
post) is still implemented as a control exception that is caught by the
implicit CONTROL block of the coro.
daniel
