Reference semantic ranges and algorithms (and std.random)

[monarch_dodra]

On Thursday, 27 September 2012 at 10:06:54 UTC, Joseph Rushton 
Wakeling wrote:
> On 25/09/12 18:36, monarch_dodra wrote:
>> Thank you for bringing it up. The problem is indeed as you 
>> said, and making the
>> PRNGs references types fixes it.
>>
>> I have a pretty well developed first iteration. I hope that by 
>> the end of next
>> week, I'll have something to show.
>
> That would be fantastic.  I'm a bit compromised right now 
> time-wise but do ping me if I can do anything to help you test 
> stuff, particularly wrt RandomSample.

Well, it took me a month (I was working on other things), but I 
have provided a change to make PRNGs reference ranges.

The pull request is here:
https://github.com/D-Programming-Language/phobos/pull/893

Please review or comment.