Re: Strange crash on custom iterator

["Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>]

On 2018-07-04 11:55, J-P. Rosen wrote:
> Le 04/07/2018 à 09:53, Dmitry A. Kazakov a écrit :
>> On 2018-07-04 09:33, J-P. Rosen wrote:

>> Premature optimization, huh? And you still need UTF-8 string type
>> even if you are going to convert it to something else. Back to the
>> square one, how to design an UTF-8 string type?
>>
> Choosing a representation that allows a more efficient algorithm is
> proper design, not premature optimization.

But UTF-8 is actually more efficient in most cases than 
Wide_Wide_String. Random string indexing is practically never used.

> And the point is that when you receive a string, you don't know before
> looking at the BOM (or other recognition techniques) whether the octets
> you received are pure Latin-1 or UTF_8 encoded. So you need to store it
> in a plain String.

That is not a string at all, it is a stream array or an array of octets.

> We discussed that point, and the agreement was that making a different
> type would force the user to many conversions that would bring nothing
> but trouble, and make Ada once again look impractical out of excessive
> purism.

Exactly my point. Explicit conversion are necessary because Ada's type 
system is unable to model strings in a type-safe way.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de