handful and interval

[Sven Torvinger]

On Monday, 3 September 2012 at 10:42:34 UTC, Andrei Alexandrescu 
wrote:
>> I would advocate using, a < x < b, this trivially addresses 
>> open/closed
>> intervals etc.
>>
>> I disagree with the porting from other languages argument... 
>> comparing
>> bool with < > is not a common occurring pattern, and even if 
>> there is
>> such code in the wild, many coding standards would force the 
>> use of ()
>> if using such an expression anyway... so the porting issues 
>> would be
>> minimal.
>
> It's a sensible argument. What about "among"?
>
> Andrei

Since 'among' only is concerned with equality it doesn't suffer 
from the open/closed interval complication... thus in this case, 
the simplest solution is the best imho... 'in' sugar would not 
add much to the readability.

if (a.among("struct", "class", "union")) { ... }