DIP61: Add namespaces to D

[Steven Schveighoffer via Digitalmars-d]

On Mon, 28 Apr 2014 09:24:59 -0400, Steven Schveighoffer  
<schveiguy at yahoo.com> wrote:

> On Sat, 26 Apr 2014 05:31:51 -0400, Walter Bright  
> <newshound2 at digitalmars.com> wrote:
>
>> http://wiki.dlang.org/DIP61
>>
>> Best practices in C++ code increasingly means putting functions and  
>> declarations in namespaces. Currently, there is no support in D to call  
>> C++ functions in namespaces. The primary issue is that the name  
>> mangling doesn't match. Need a simple and straightforward method of  
>> indicating namespaces.
>>
>> There have been many proposals earlier:
>>
>>    http://forum.dlang.org/post/lhi1lt$269h$1@digitalmars.com
>>
>> but it seems to me that the simplest, most straightforward approach  
>> would be better.
>>
>> As more and more people are attempting to call C++ libraries from D,  
>> this is getting to be a more and more important issue.
>
> Just reviewed the DIP, I've been following the discussion.
>
> One possible issue, to which I think I know the answer but it should be  
> explicit, is conflicting top-level functions and namespace functions:
>
> extern(C++, N) { void foo();}
> extern(C++) void foo();
>
> Clearly, calling N.foo would be unambiguous, but there is no namespace  
> to qualify the global foo. I'm assuming .foo() would work, but this  
> should be explicit in the DIP. Right now it says use the namespace to  
> qualify ambiguous calls.
>
> I think the proposal looks good to me.

I have to rescind this endorsement. I think there is an issue with name  
lookup. I will explain in a reply to the other thread.

-Steve