Re: [iostreams] Need help understanding the Jam language

From: Jonathan Turkanis (technews_at_[hidden])
Date: 2005-06-04 17:08:06

Rene Rivera wrote:
> Jonathan Turkanis wrote:
>
>> Among other thing, I realized I don't really know how to return a
>> value from a Jam rule.
> [...]
>> I just discovered that the return statement does not seem to prevent
>> control from continuing past the "if" block to the line marked "...".
> [...]
>> I really have no idea what's going on here.
>
> It's simple ;-) "return 1 ;" sets the return value to the strings
> ["1"] (all values Jam are string lists). When the rule finishes, by
> getting to the last statement, the return value is passed back to the
> caller.

Ugh!!! I thought of this, but found the following at perforce
(http://public.perforce.com/public/jam/src/Jam.html):

"return values ;

Within a rule body, the return statement sets the return value
for an invocation of the rule and terminates the rule's execution."

I guess this is wrong/obsolete. Is there an correct/up-to-date Jam language
reference?

Thanks!

Jonathan