Vector swizzling a-la GPU shaders in D

[Denis 'GeneralGDA' Gladkiy via Digitalmars-d]

I was playing with D for a several weeks and came up with a 
swizzling implementation for a vector class. The feature is 
common for languages like GLSL or HLSL. One of the use cases is a 
vector cross product with only two GPU instructions.

Here is the idea:
http://pastebin.com/Hvntey0s

Here is the full source of the vector:
http://pastebin.com/AnJKXBry

The code allows you to write something like "const foo = 
bar.yyzx" where bar is a vector and ".yyzx" constructs a new one 
from it.

This is not a production code. I believe one could make it much 
better. But the idea seems to be interesting in the area of inner 
DSLs for D.