Ranges

[Lionello Lunesu]

Ary Borenszweig wrote:
> Lionello Lunesu wrote:
>>
>> "dsimcha" <dsimcha at yahoo.com> wrote in message 
>> news:h1e6qp$umo$1 at digitalmars.com...
>>> Ranges are really just a form of iterators that's given sane syntax 
>>> (unlike C++)
>>> and relies on this compile-time duck typing instead of virtual 
>>> functions and
>>> class-based interfaces (unlike Java and C#).
>>
>> Actually, C# doesn't care for the interfaces. They are just there to 
>> help you implement a compatible iterator. C#'s foreach will accept any 
>> type with "T GetEnumerator()", where type T in turn implements "bool 
>> MoveNext()" and "S Current { get; }".
> 
> Wow. :-)
> 
> You always learn something new...
> 
> Thanks, Lionello!

Hehe, you're welcome!

L.

By the way, using 'duck typing' (instead of implementing 
IEnumerator/IEnumerable) is the fastest way to iterate in C#, since it 
won't emit virtual calls and try-finally-Dispose. :)