Recursive vs. iterative constraints

[Daniel N via Digitalmars-d]

On Saturday, 16 April 2016 at 03:46:25 UTC, Jonathan M Davis 
wrote:
> On Friday, April 15, 2016 22:42:55 Andrei Alexandrescu via
>> Pros? Cons? Preferences?
>
> The first one is way cleaner IMHO.
>
> - Jonathan M Davis

Strong preference for iterative, one key improvement of D's CTFE 
vs legacy C++ template meta programming is that you can avoid 
recursion in the normal case(only using it when it's a clear win, 
which I fail to see in this example).

Furthermore, I also fail to see what Unqual solves, 
'isInputRange' should correctly handle all qualifiers.

allSatisfy!(isInputRange, staticMap!(Unqual, Ranges))
=>
allSatisfy!(isInputRange, Ranges)