Old problem with performance

[Weed]

Bill Baxter пишет:
> On Sun, Feb 22, 2009 at 1:02 AM, Weed <resume755 at mail.ru> wrote:
>> Bill Baxter пишет:
>>> 2009/2/21 Weed <resume755 at mail.ru>:
>>>> Weed пишет:
>>>>> Bill Baxter пишет:
>>>>>
>>>>>> Why don't you just show us the class in the way you would like to
>>>>>> write it in C++, and we'll show you how to write it in D, or finally
>>>>>> agree with you that it's not possible.   But as long as you continue
>>>>>> to be hand-wavy about "common base classes" we're at a bit of an
>>>>>> impasse.  So far everyone thinks D can do what you want it to do based
>>>>>> on your vague descriptions.
>>>> As I said, you can write everything using "goto" and "if".
>>>>
>>>> ...But why you do not like the original example of this thread?
>>> Please post again.  I don't seem to recall any detailed example.
>>>
>>> --bb
>> http://www.digitalmars.com/pnews/read.php?server=news.digitalmars.com&group=digitalmars.D&artnum=83506
> 
> You should use a struct there!   Your code does not show you doing
> anything that would even remotely suggest using a class is worthwhile.
>  You're doing value operations on value types.  That's what structs
> are for.
 	
Why?

What if I have not substantiated the fact that c1 is a class I should
use there a structure?

Used in D a model of placement classes only in heap have a rule "if you
made the class and trying to pass it by value is somewhere in your code,
there is a design error?