in reply to (XS): returning an iterator.

I did something similar for Sort::Key, emulating a closure in XS. The trick I used was to return a new XSUB with the state attached in a magic table.

The source code is here. The function returning the XSUB closure is _multikeysorter and there are two auxiliary functions _xclosure_make and _xclosure_defaults to set and retrieve the data attached to the XSUB.

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Re^2: (XS): returning an iterator.
by BrowserUk (Patriarch) on Sep 23, 2010 at 09:45 UTC

    You make it look simple enough. But... :) where does cv come from in the following line from XS_Sort__Key__multikeysort? 

        AV *defaults = _xclosure_defaults(aTHX_ cv);

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      It gets introduced by the XS macro.
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