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Re^4: cross scope gotos?

by Anonymous Monk
on Apr 06, 2010 at 13:20 UTC ( #833034=note: print w/ replies, xml ) Need Help??

in reply to Re^3: cross scope gotos?
in thread cross scope gotos?

No serious application whatsoever for this nonsense...

Comment on Re^4: cross scope gotos?
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Re^5: cross scope gotos?
by LanX (Chancellor) on Apr 06, 2010 at 13:28 UTC
    > No serious application whatsoever for this nonsense...

    sigh, YOU again...

    you may use it for

    1. easily leaving deeply nested recursions, without the need to return step by step
      perl -e ' my $x; sub rec { goto STOP if ++$x>10; print $x; rec()};rec();STOP:' 12345678910
    2. easily defining specific labels and jump-commands in DSLs (Domain Specific Languages) and encapsulating all the logic within the subs.

      For instance if you want to emulate and/or compile an assembler language you can easily implement it as valid perl-code then easily using Perl as macro language:

      use Assembler::6502; # fictitious module # implementing Mnemonics as subs MARK: LDX 10; ADD 3; macro1(); # Perl sub to include/call mnemonics JSR SUB2; JMP MARK; SUB2: ... ... RET

    serious enough?

    Cheers Rolf

    UPDATE: added examples

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