skaller wrote:
> Felix now supports first class iterators, as a special
> case of generators. Here is an example:
Thats so awesome. Much better than my streams :) A couple comments on
the syntax. First off, python is just about to add sending data back to
their generators, but they're using a slightly different to receive data
from the calling function. They use the equivalent of "val inc = yield
counter;". Did you consider that syntax? The second is related. The
overloading of the curry syntax throws me off a little. Using the
curry-style argument list may suggest to a newbie that you could do "var
x = f 5 10;" to get one result. What about using the "return an
anonymous function" syntax? This, along with the first comment would
result in something like:
------------------------------------
#import <flx.flxh>
gen f(init:int):int->int = {
var inc = 0;
var counter = init;
again:>
counter += inc;
inc = yield counter;
goto again;
}
Of course, what would it mean to have "gen f(init:int):int" (assuming anonymous
function return)? If this is allowed, and actually does just return a single
value, then gen doesn't seem all that different from procedures. Your later
comments on this suggest that certain forms of gen are really just a reduced
form of proc. This suggests that we might be able to merge the functionality,
but I'm not sure how possible that is.
Finally, the best way to signify the end of the generator still seems to
be to wrap things in opt. Is this the fastest way we can signify the
end, or are there any compiler-side tricks that can be done to optimize
things?
> Note the new keyword 'gen' which denotes a generator.
> A generator is any function with internal state.
> C bindings must also be declared generators if they
> access state, for example: malloc(), random() etc are generators.
> All class constructors are also generators.
Are you referring to it as being conceptually generators, or that you're
actually going to change the library to reflect this?
-e
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