Ranges and random numbers -- again

[Andrei Alexandrescu]

On 6/18/13 4:57 AM, Joseph Rushton Wakeling wrote:
> On 06/18/2013 05:00 AM, Andrei Alexandrescu wrote:
>> Once you consume an input range, there's no way to consume it again. It's done.
>
> Sure, but what I'm proposing is a stronger constraint than "random ranges should
> be input ranges".

I'm not sure I understand what you are proposing. If a true random range 
is to be an input range with additional constraints, one simple thing is 
once .empty returns true there's no more extracting elements from it.

Andrei