[Nickle] Nickle bug/misfeature: storage for growable arrays of growable arrays

[Bart Massey]

If you want things to be like C, you can just make
   struct s;
mean
   struct s = {};
and similarly for arrays.

Shy of growable array initializers via continuations :-), I
would just like initializer expressions to work like they do
for hashes.  This would at least take care of the nested
growable array case, which is the thing I normally care
about anyhow.  And after all, we don't have hash
comprehensions.

	Bart

In message <E1CpvZU-0007Q2-PL at evo.keithp.com> you wrote:
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> 
> Around 11 o'clock on Jan 15, "Bart Massey" wrote:
> 
> > Sigh.  Do we want this
> >    struct {int x;} s;
> > to be different from this?
> >    struct {int x;} s = {};
> 
> The reasoning was that in C, composite datatypes are automatically 
> allocated but not automatically initialized, so we wanted things in nickle 
> to work about the same -- storage automatically allocated, but values left 
> uninitialized.
> 
> > For growable arrays, it gets more complicated, since
> > growable arrays of objects (of any type) don't have a
> > "default value" like hashes do.  This should probably be
> > fixed.  Perhaps things like
> >    int[...][...] a = {{} ...};
> > should work?
> 
> We've shied from this because comprehensions make it "hard".  Although 
> it would be cool:
> 
> 	int[...] primes = { [i] = nth_prime(i,[]) };
> 
> could lazily compute all primes with a sieve...
> 
> -keith
> 
> 
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