DIP61: Add namespaces to D

[Dicebot via Digitalmars-d]

On Sunday, 27 April 2014 at 08:16:58 UTC, Andrej Mitrovic via 
Digitalmars-d wrote:
> On 4/27/14, Dicebot via Digitalmars-d 
> <digitalmars-d at puremagic.com> wrote:
>> Using named mixin templates for pure scope resolution is side
>> effect and should be discouraged in any reasonable code.
>
> There's also the un-instantiable class trick:
>
> -----
> final abstract class Scope
> {
> static:
> }
> -----
>
> A struct-based version is also possible. It's used in Phobos 
> and other
> libraries. There's a need for scoping symbols other than in 
> modules,
> but I'm not a fan of pushing C++ features in D. Not unless we 
> have a
> really solid DIP.

I believe this is a temporary workaround. Once bugs and 
deficiencies of existing module system will be taken care of, 
there won't be any need in using namespace emulation.

> Idealism aside, modules have some implementation issues right 
> now
> which force people to use workarounds like named mixins or the 
> above
> trick, e.g. package access not being propagated up/down a 
> hierarchy.

This pops up very often so I have just went and implemented proof 
of concept for package(pkg1.pkg2.pkg3) protection attribute 
syntax. Was relatively straightforward, will do a PR soon-ish 
after some cleanup.