Recently I added one more generator operator to Gauche, for I found its use case

and felt it's missing.

-- Function: gflatten gen

The argument GEN is a generator that yields lists. This procedure

returns a generator that first calls GEN to obtain a list, then yield

its elements one at a time. Once the list is exhausted, it calls GEN

again and repeat the process.

It is similar to gconcatenate and gappend, but they operate on slightly

different domains. Using Haskellish notation, their types can be described

as follows:

gconcatenate :: Generator Generator a -> Generator a

gflatten :: Generator [a] -> Generator a

(cut apply gappend <>) :: [Generator a] -> Generator a

gappend :: Generator a, Generator a, ... -> Generator a

If you feel it makes the spec bloated, I won't push it. It can be written as

(lambda (g) (gconcatenate (gmap list->generator g)))

On Thu, Sep 3, 2015 at 12:07 PM, John Cowan <xxxxxx@mercury.ccil.org> wrote:

Arthur A. Gleckler scripsit:

> Unfortunately, the diff isn't useful because I made a mistake while
> removing the ^M characters added in your new version. (It's okay to add
> them, but it would have been better to do that as a separate version.)
> That means that every line appears in the diff. I'll watch out for that
> in the future.

My fault. I'll try to make sure that there never are any henceforth. The -b
option I think suppresses ^M characters, though.

--
John Cowan http://www.ccil.org/~cowan xxxxxx@ccil.org
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