Focus

[Sergei Nosov]

On Saturday, 19 January 2013 at 02:50:35 UTC, Andrey wrote:
>> This all falls apart once you decide you need "friend" access.
>
> I haven't seen such situations yet. According to OOP concept 
> they must be very rare, so I tend to consider them more of 
> architecture and logic mistake (and C++ is one big architecture 
> and logic frankenstein).

Sorry for being a little harsh, but there's a big warning sign on 
the Overview page of this site:

Who D is Not For:
Language purists. D is a practical language, and each feature of 
it is evaluated in that light, rather than by an ideal.

All of this stuff about pure (or true) OOP concept, when you just 
don't need such hacks as "friend" is good on paper. But most of 
the time it's very expensive to stick with such kind of purity 
rigorously.

Or even is just a completely bad idea. Consider algorithms for 
data structures being members in true-OO vs. STL/D-ranges 
approach or everything is a function with no side-effects in 
"pure" functional languages.