getting more random

[Benjamin Kosnik]

Attached is the patch from December 2008's thread about random, against
today's tree. It seems like a good starting point modulo the unresolved
issues with respect to the <random> interface as is used in
20_util/shared_ptr/thread/*.cc. As trunk is now open for stage uno, this
seems like an opportune time to start putting this work in.

Ed? Paolo? 

Here's my summary of outstanding issues.

Paolo:
- Wants time for algorithm analysis, getting feedback from TR1
implementation and use, literature review. 

Benjamin:
- What interface targeted? 

Ed:
- Wants to actually test the quality of the  distributions (and the
  engines), implementing histogram class.
- Error handling on bad parameters in distributions. Compile, run
  time, or no errors?

Please feel free to correct any of this.

Since the time this was last discussed, the <random> interface
for C++0x was specified in N2836. This specification includes concepts.
My suggestion is to implement things like mersenne_twister_engine with
the template parameters as specified in N2836, even though concepts are
currently not supported. Any objections or alternate suggestions?

Are there any updates on this patch, specific algorithms, or the testing
and feedback issues? 

best,
benjamin 



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