Friends in D, a new idiom?

[Vijay Nayar]

On Sunday, 27 May 2018 at 06:37:56 UTC, IntegratedDimensions 
wrote:

> I'm looking for something lightweight and direct. It is not for 
> total encapsulation control but to simply provide an extra 
> level of indirection for write access to make the object look 
> read only to those that directly use it.

I think const is something that may be helpful then. If applied 
consistently, especially with methods, it can also protect you 
from accidentally making mutations in functions where were 
originally intended to be read-only.  Having an object "look" 
read-only is more of a stylistic thing based on conventions about 
method naming, etc. Personally I lean towards having the compiler 
enforce it.