Expression templates

[Sean Kelly]

Don Clugston wrote:
> The recent language improvements (especially, opAssign) have made 
> expression templates eminently feasible. Here's a proof-of-concept which
> implements parsing of the basic vector operations of addition and scalar 
> multiplication.

Interesting.  Yet another example of where D's reference semantics for 
classes dramatically simplify things.  The code looks quite natural, and 
without the debugging code is exceedingly short.  Nice work!


Sean