On Aug 26, 2015, at 6:06 AM, Rémi Forax <fo...@univ-mlv.fr> wrote:
>
> it's less powerful but it seems you can encode all your examples of loops too.
No, I don't think so. Multiple pred/fini pairs implement multiple loop exits.
Any loop with an "if-return" in it has an exit distinct from the loop's main
test.
And each exit requires a different fini function, to encode a special result.
The match loop has this multi-exit character:
for (int i; i < a.len; i++) {
Object e = a[i];
if (ok(e)) return e; // first fini function; could also be e.payload
}
return null; // second fini function; could also be throwNotFound or
Optional.none
Sometimes even "&&" type predicate logic expands into multi-exit code, if the
loop needs to return a value that encodes which sub-predicate caused the exit.
— John
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