So, if I understand coroutines correctly, what about the following idea?

• Create a function named &yield and export it into the caller's namespace.
• When the module exporting the &yield is used, it uses B::Deparse to make the calling code easier to parse and then insert unique labels with naked blocks before every &yield.
• When &yield is called, it uses PadWalker to save the state of the scratchpad and toggles a bit saying that "I've been called", and then returns from the sub using something like rreturn from Want.
• At the top of every sub, insert a bit of code that goes to the label in front of the last &yield called in that function.
• The &yield is executed, sees the bit that says "I saved the state last time", so it instead uses PadWalker to restore the state.

Am I missing anything here? This implementation seems a lot simpler (and closer to Perl6 syntax) then the Coro bundle on the CPAN.

As far as I can tell, this would still be a rather limited implementation and might not work with closures. However, it seems so obvious that I know I have to be missing something...

Cheers,
Ovid

Join the Perlmonks Setiathome Group or just click on the the link and check out our stats.

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.