Tristate - wanna?

[Andrei Alexandrescu]

On 10/31/13 2:35 AM, Lionello Lunesu wrote:
> On 10/26/13, 17:42, Andrei Alexandrescu wrote:
>> unittest
>> {
>>      Tristate a;
>>      assert(a == Tristate.no);
>
> Why not have '0' map to unknown? Seems to more useful, like float.nan
> and the like.

So logical operations are closer to the built-in Boolean ones, and 
conversion from bool is simple. If there's no such advantage, 0 should 
be the most frequent value (comparisons against 0 are smallest and fastest).

One possibility is to make the initial value unknown by default (which 
is a great idea).

I'll post shortly an update to Ternary (better name) along with 
additions to std.allocator.


Andrei