distinguish between classes and structures

[Weed]

Weed пишет:
> Bill Baxter пишет:
>> On Mon, Dec 15, 2008 at 3:35 PM, Weed <resume755 at mail.ru> wrote:
>>> Who can provide a link to an explanation about why in D has taken to
>>> distinguish between classes and structures?
>>>
>>> (Sorry for my bad English)
>>>
>>
>> The main justification is eliminating the slicing problem.
>> http://cplusplusgems.blogspot.com/2005/10/what-is-slicing-problem-class-base.html 
>>
>>
>> D solves it by making it impossible to have a class instance as a 
>> value type.
>>
> 
> 
> Why not disallow the casting for structs, leaving the possibility of up 
> casting for the links and pointers to the structure?

What is the best place for such questions?