Flame bait: D vs. Rust vs. Go Benchmarking

[Joseph Rushton Wakeling]

On Wednesday, 24 July 2013 at 19:54:19 UTC, Andrei Alexandrescu 
wrote:
> What are the other problems aside from value semantics?

The serious problems mostly derive _from_ the value semantics. 
They include the annoying (if you forget to add "ref" when 
passing to a function, the source RNG won't get updated and your 
program will have unwanted correlations) and the critical (you 
can't safely store a copy of an RNG inside another object without 
it being a copy, which again means the source RNG won't be 
updated); this latter means that the design of ranges that "wrap" 
an RNG, like RandomCover and RandomSample, can't be given an 
arbitrary RNG to use without generating unwanted correlations.

In short, having them as value types makes it impossible to 
design tools like RandomCover etc. to be correct, safe and 
straightforward.

There are other issues there, but they are mainly implementation 
errors that can be fixed (I've fixed several of them recently and 
will carry on doing so). All the fundamental problems stem from 
the value semantics.