Purity (D2 standard libraries / object.d)

[Stewart Gordon]

Walter Bright wrote:
> Michel Fortin wrote:
>> Hum, could the compiler be trusted to add the memoization code to pure 
>> functions so they can stay pure?
> 
> If the compiler does general memoization on pure functions, all it has 
> to do is use the bits of the arguments passed on the stack to the 
> function as an index into an associative array of the return values.
<snip>

Walter, before you go and implement any of this, I must point out that 
it's spelt "memorization" and "memorize".  (Or "memorisation" and 
"memorise" if you're British, but that's an aside.)

Stewart.