My Kingdom For ...

[Ary Borenszweig]

Janice Caron escribió:
> 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!

I think the best solution is the one in .Net:

object value;
if (aa.TryGetValue(key, out value)) {
   // Key found, value may be null
} else {
   // Key not found
}