Re: Is multi-level function return possible?

On 2014-03-14, Kaz Kylheku <kaz@kylheku.com> wrote:


>> Standard Pascal did have not have closures: you could pass a function
>> by name as an argument to another, but its definition had to be
>> visible both at the point of passing the name and at the point of
>> invocation [through the aliasing argument].
>
> Okay, forget Pascal then with these bizarre restrictions. Let's
> pretend that "Pascal" really means "GNU C" (with its local functions).


> http://gcc.gnu.org/onlinedocs/gcc/Nested-Functions.html
>
> GNU C has real downard funargs, a.k.a. non escaping closures.
>
> (I thought Pascal was like this; but if not, it's too broken to
> warrant another thought.)
>
> So your comment could have said "your GNU C is showing". :)


Syntax is similar, but most Pascal implementations don't use
trampolines, but simply expand the procedure type to be wider (frame
pointer and address).


Gnu Pascal inherited the C school of thought, and uses trampolines
afaik to keep function pointers (single) pointers at all cost.


The earlier mentioned Delphi anonymous functions (closure-likes)
internally are ref counted interfaces to my best knowledge.


P.s. quickreading your URL I didn't really see if GNU C can have
multiple levels of nesting. Pascal can.
[Yes, it can. -John]

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