Stackless resumable functions

[ketmar via Digitalmars-d]

On Sat, 21 Feb 2015 21:19:32 +0000, bitwise wrote:

> Input on this would be appreciated.

it seems to me that you can "abuse" delegates for this (i mean the 
underlying "fat pointer"). resumable function can create closure (i think 
all the code for this is already here), "resume address" pointer (this 
can be added to closure), pointer to "real" delegate, hidden "yield 
point" address, and return a delegate which does something like this on 
call:

* executes "real" delegate from "resume address".
* "real" delegate yields by doing indirect call to "resume address"
* assembler code at "resume address" stores new resume address (it's on 
stack now)
* and returns from "wrapping delegate"

so from the point of programmer this will look as an ordinary delegate, 
even with the same type, and it will be usable anywhere where ordinary 
delegate is usable.
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