new DIP47: Outlining member functions of aggregates

[Dicebot]

On Sunday, 8 September 2013 at 12:46:49 UTC, Gary Willoughby 
wrote:
> This proposal is just going back to the hell of header files 
> again.

It has nothing to do with header files. Or real header file 
problems.

> Seriously, this goes against everything you learn as a 
> programmer, nothing should ever be typed twice and then to say 
> that the declaration and implementation could be different just 
> boggles my mind?!?! Great more work!

It is no different from overriding `interface` methods in class. 
 From the code structure point of view, declaration is interface. 
Implementation is implementation. Keeping those separate may 
sometimes/often be useful.

That said, I am strongly against permissive rules proposed in 
this DIP. It should be similar to overriding rules - any smallest 
difference between to signatures and program stops compiling. 
Otherwise it is maintenance hell.