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Re: Try::Tiny - return in catch from sub

by mjscott2702 (Pilgrim)
on Nov 26, 2010 at 14:06 UTC ( #873870=note: print w/ replies, xml ) Need Help??


in reply to Try::Tiny - return in catch from sub

The doc for that module says it supports a return from the "try" block, doesn't mention the "catch" block - you could try setting a flag inside the catch (defined at the sub level) and return if that flag is set e.g.

sub foo { my $error = 0; try { die; } catch { print "error\n"; $error = 1; } return if $error; print "no_err\n"; }

I agree from a program flow point-of-view, it would be better if the return inside the catch worked as expected - it may be that the "catch" is itself similar to a sub, and the return is returning from that?


Comment on Re: Try::Tiny - return in catch from sub
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Re^2: Try::Tiny - return in catch from sub
by Anonymous Monk on Nov 26, 2010 at 15:03 UTC
    um, it says what try returns, what catch returns ... see this example
    try { die_sometimes(); } catch { # ...code run in case of error } finally { if (@_) { print "The try block died with: @_\n"; } else { print "The try block ran without error.\n"; } };
    if you want to return from your sub from within a try/catch then use as directed
    use TryCatch; sub foo { my ($self) = @_; try { die Some::Class->new(code => 404 ) if $self->not_found; return "return value from foo"; } catch (Some::Class $e where { $_->code > 100 } ) { } }
    Try::Tiny is for when TryCatch is too much, it is not a drop in replacement, mind the caveats
      um, not in the CPAN documentation:

      This module provides bare bones try/catch/finally statements that are designed to minimize common mistakes with eval blocks, and NOTHING else. This is unlike TryCatch which provides a nice syntax and avoids adding another call stack layer, and supports calling return from the try block to return from the parent subroutine.

        That says Try::Tiny does not support returning from try/catch/finally blocks like TryCatch, its how they're different

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