My Kingdom For ...

[Michiel Helvensteijn]

Janice Caron wrote:

> On 21/02/2008, Michiel Helvensteijn <nomail at please.com> wrote:
> 
>> It's silly that 'in' does not return a bool.
> 
> Huh? But I don't want it to return a bool. If it retured a bool, I
> wouldn't be able to do
> 
>     auto p = key in aa;
>     if (p is null)
>     {
>         /* do something */
>     }
>     else
>     {
>         return *p;
>     }
> 
> Without that ability, you'd have to do a double-lookup!

In those cases you use that library function I mentioned. It would do the
exact thing 'in' does now.

When I read: key in aa, I understand: key is member of aa. Like the operator
in set theory (looks like an epsilon). Apparently I'm not alone in this
if !in has been requested so often.

-- 
Michiel