Old problem with performance

[Weed]

Michel Fortin пишет:
> On 2009-02-08 23:43:13 -0500, Weed <resume755 at mail.ru> said:
> 
>> Michel Fortin пишет:
>>> On 2009-02-08 09:30:08 -0500, Weed <resume755 at mail.ru> said:
>>>
>>>> Let's assume, polymorphism is necessary to these objects
>>>
>>> Polymorphism doesn't work very well while passing objects by value, even
>>> in C++. This is called the slicing problem.
>>> <http://stackoverflow.com/questions/274626/what-is-the-slicing-problem-in-c>
>>>
>>>
>>>
>>> I think D does a good job at avoiding that problem.
>>>
>>
>> By performance loss
>> :(
> 
> No. By forbiding the cases that leads to slicing, like returning a
> polymorphic object by value.
> 

Let's think, can there are other ways to solve problem?

Here, for example my reasons:
http://www.digitalmars.com/webnews/newsgroups.php?art_group=digitalmars.D&article_id=81958