Larry Wall larry-at-wall.org |Perl 6| wrote:
a() orelse b()
you might want to:
succeed on a()
trap mild failure of a() and try to succeed on b() instead
fail completely on drastic failure of a()
At the moment this three-way distinction depends on whether a() returns
defined/undefined or throws an exception. Maybe that's good enough.
I don't want to overcomplexify things, but I don't want to
undercomplexify them either. :)
I'm thinking that, rather than have a zillion options to pre-configure
the fail mode of that group of functions, it can be done by having a
CATCH handler that calls resume on the ones you want to pop back out.
{ # some block scope
use fail;
a() orelse b();
more-stuff-here;
CATCH {
when xxx { .resume() }
}
This is also handy in that you can set flags or something before getting
back to the main expression. This makes EH more like a "footnote" to
the code than anything I've used before.
--John
