Generating members from parameter tuple

[Dicebot]

On Monday, 19 August 2013 at 06:56:24 UTC, Brad Anderson wrote:
> ...

I remember asking Andrei on IRC about feature as "declaration 
foreach" to exactly simplify such patterns. He kind of agreed it 
may be useful and wanted to consult with Walter if it is worth a 
DIP but seems like everyone including me has forgot it :)

In a meanwhile, here is a recursive template-based alternative:

http://dpaste.dzfl.pl/f9def804