challenge: implement the max function

[Andrei Alexandrescu (See Website For Email)]

Here's a simple challenge: implement the max function. Requirements:

a) generic
b) efficient
c) preserve lvalueness when possible such that one can write e.g.

max(arr[0], arr[1]) *= 0.9;

d) should accept two or more arguments
e) should return the "smartest" type, e.g. max of an unsigned int and 
unsigned long should return unsigned long
f) short and easy to understand

I don't think it's possible to implement the function to the spec in 
current D, so designs are allowed to invent new features, as long as 
they define them thoroughly.

Looking forward to any takers!


Andrei