On Monday, 12 January 2015 at 00:51:25 UTC, Walter Bright wrote:
It's a great question. I have a lot of experience with error
codes, and with exceptions. I have zero with the packed scheme,
though that doesn't stop me from having an opinion :-)
Perhaps I misunderstand, but given A calls B calls C,
A => B => C
and C detects an error, and A knows what to do with the error.
B then becomes burdened with checking for the error, invoking
some sort of cleanup code, and then propagating it.
Wouldn't this be uglifying B's source code?
With exceptions, C throws, A catches, and B's cleanup happens
automatically.
This matters very much for pipeline style programming (i.e.
ranges and algorithms).
Here is one approach to it:
http://fsharpforfunandprofit.com/posts/recipe-part2/
