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Re: Operator overloading with returning lists?

by diotalevi (Canon)
on Nov 30, 2008 at 08:13 UTC ( #726882=note: print w/replies, xml ) Need Help??


in reply to Operator overloading with returning lists?

If your overloaded function was written in XS, I could imagine it might be possible to ignore the context and foricibly return multiple things. Just push everything onto the stack even though you're always in scalar context.

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Re^2: Operator overloading with returning lists?
by JavaFan (Canon) on Dec 01, 2008 at 16:56 UTC
    I don't think that will work if the caller expects just one return value.

      I'm just saying it's theoretically possible to violate your caller this way even if it wasn't expecting it.

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        The problem is that if your XS pushes multiple things on the stack, and the caller expects just one, the caller will pop up just one thing of the stack, leaving the rest there.

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[Corion]: (we're at 3.24.0 , so maybe the feature appears this year even)
[erix]: Ah, they're reverse-engineerin g postgresql - good idea
[erix]: (believe me, the postgres docs are a whole lot more readable than the SQL-standard documents (also a lot cheaper...)
[Corion]: erix: Yes - I see no shame in adopting whatever works elsewhere ;) Especially if it has proven solid already, like Pg has :)
[Corion]: Maybe I shouldn't dig into extracting the Pg query engine from its source code then and just wait until SQLite gives me the same features :-)) But I'd really like a Pg-compatible query parser for Perl too ;)))

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