Define methods using templates

[Claude via Digitalmars-d-learn]

> I just saw this post, which is essentially the same question as 
> Basile Burg's. I hope that a college (in France?) is teaching D 
> and that this is a homework assignment. Cool stuff! :)

Maybe using templates to create properties is a bit overkill in 
this example. But I could not solve what I thought would be a 
very simple and straightforward "template use-case" (initially 
I'm an embedded RT system C/asm developer).

I'm doing this for a personal project of a 3D engine. As I know 
little about C++/Java or other OO language, I thought I would do 
it directly in D, which seems very promising to me (but 
unfortunately not taught in France as far as I know).