How does D improve design practices over C++?

[Janderson]

Tony wrote:
>>
>> In C++ its standard practice by most programmers to disable the copy 
>> constructor for many of the classes they create.  Some companies it 
>> mandatory to either disable it or implement one.
> 
> I do that too: I "disable" (declare private and don't supply an 
> implementation") the compiler-called class functions by default when 
> designing a class and putting them back if they are needed.
> 

You are repeating what I just said.  The point is D its opt in rather 
then opt out which is the point of the original thread "improve design 
practices".  In C++ if you didn't know you had to do that its something 
you'd need to learn.  In D its not.

C++ is a huge language, and not many know the entire language.  Case in 
point, you didn't know what Delegates where yet many C++ programmers use 
them frequently.  Its better if the language makes it easy rather then 
requiring the programmer to do something to be correct.  Just like 
expecting an email program to have spell check your emails.  Modern 
languages should do the same.

-Joel