Exception handling in switch (Preview)

[Guy Steele]

On Apr 24, 2024, at 10:50 PM, Kevin Bourrillion <kevinb9n at gmail.com> wrote:

Hey Angelos!

For whatever my take is worth here, I'm also skeptical. I think the bar for adding another way to catch exceptions should be really high, and the benefits here wouldn't clear it. I just don't expect the nested switch-in-try will be painful enough often enough.

This feature would only be applicable when the whole possibly-exception-producing code can fit into a single expression in the switch header . . .

This raises a very good question: what do we expect the "whole possibly-exception-producing code” to look like in practice?

I conjecture that the attractive situation for using switch-with-“case throws"-clauses will NOT involve arbitrarily large expressions that might need to be refactored, but rather a single method call (or possibly an expression with a single operator) where all argument expressions are variables or constants, rather than other stuff that might cause exceptions.

But I am not sure. So maybe this is a conjecture that could be researched.

—Guy

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