Tristate - wanna?

[sarn via Digitalmars-d]

On Saturday, 26 March 2016 at 22:39:58 UTC, Alex Parrill wrote:
> On Saturday, 26 March 2016 at 22:11:53 UTC, Nordlöw wrote:
>> I can think of many variants of for this. What about
>>
>>     { yes, // 1 chance
>>       no, // 0 chance
>>       likely, // > 1/2 chance
>>       unlikely, // < 1/2 chance
>>       unknown // any chance
>>     }
>>
>> ?
>
> If we're going down that route, might as well use state tables. 
> With CTFE + templates, you could possibly do something like 
> this:
>
>
> 	immutable State[] StateOrTable = ParseStateTable!q{
> 	        | yes | no       | likely | unlikely | unknown
> 	------------------------------------------------------
> 	yes     | yes | yes      | yes    | yes      | yes
> 	no      | yes | no       | likely | unlikely | unknown
> 	likely  | yes | likely   | likely | likely   | likely
> 	unlikely| yes | unlikely | likely | unlikely | unknown
> 	unknown | yes | unknown  | likely | unknwon  | unknown
> 	};

I just hope we don't end up with an abomination like Microsoft's 
MsoTriState:
https://msdn.microsoft.com/en-us/library/office/ff860737.aspx

(A "tristate boolean" with five values, three of which are "not 
supported".)