New library: open multi-methods

[Jean-Louis Leroy via Digitalmars-d-announce]

On Tuesday, 18 July 2017 at 21:20:04 UTC, jmh530 wrote:
> On Tuesday, 18 July 2017 at 21:16:11 UTC, jmh530 wrote:
>>
>> I may not have been clear enough. My ideal solution wouldn't 
>> make any changes to that densematrix.d file, just the 
>> interface. So I don't have any issue with the matrix modules 
>> doing the math and the app doing the printing.
>>
>
> Well, I suppose the matrix interface would be saying that it 
> can print, so maybe not as split up as you would like. While 
> you could define a separate interface for printing, that would 
> require a change to densematrix.

Exactly. Orthogonality is essential for good composition, that is 
the reason why OOP - well, the OOP that follows the 
Simula/Smalltalk tradition - failed so badly. CLOS got it right 
40 years ago; Simula, Smalltalk, C++, Java, etc they all got it 
wrong.