Re^3: Error codes vs die exceptions vs ...

in reply to Re^2: Error codes vs die exceptions vs ...
in thread Error codes vs die exceptions vs ...

Exceptions propagate until they are handled which may be at the outermost level by Perl handling the die. Nothing between the code throwing the exception and the node handling it sees the exception.

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Comment on Re^3: Error codes vs die exceptions vs ...

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Re^4: Error codes vs die exceptions vs ... by LanX (Saint) on Jul 07, 2019 at 14:19 UTC
Sorry, I should have been clearer > > if the class can't be handled locally. let's say you want to catch one exception class directly but delay handling of other classes to higher scopes ... Then you'd need to propagate the unhandled exception classes again in the first `catch{...}` to reach the next `catch{...}` ... right? Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery FootballPerl is like chess, only without the dice}	[reply] [d/l] [select]
Re^5: Error codes vs die exceptions vs ... by haj (Vicar) on Jul 07, 2019 at 19:21 UTC
Then you'd need to propagate the unhandled exception classes That's true for Try::Tiny. My first encounter with Perl's exceptions "beyond `eval/die`" was Error, which is much like Java in that it allows you to catch a particular error class, and passes all other errors on. TryCatch also does this, but I've never used it. `Error` has its quirks as is clearly indicated in the module's description (section "Warnings"), and `TryCatch` uses the spooky Devel::Declare, so getting accustomed to propagate unhandled errors is probably a good idea.	[reply]
Re^5: Error codes vs die exceptions vs ... by holli (Abbot) on Jul 07, 2019 at 14:27 UTC
In Perl, yes. It's different for most strongly typed languages though I believe. There an exception bubbles up the stack of error handlers until it reaches one that feels responsible for it. Or none, but then it crashes the program. holli You can lead your users to water, but alas, you cannot drown them.	[reply] [d/l]
Re^6: Error codes vs die exceptions vs ... by haukex (Archbishop) on Jul 07, 2019 at 14:38 UTC
There are Perl modules that attempt to provide such a mechanism, at least TryCatch and Syntax::Feature::Try (I only say "attempt" because I haven't tested them myself). See also Task::Kensho::Exceptions and Exception::Class.	[reply]

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