I'm pleased to see that blitz includes an assortment of random generation.
I have one suggestion regarding the design. I believe it is
preferrable to pass the base random number generator (RNG),
eg. twister in the call to the member function random, rather than
having the RNG be a member of the class.
For example:
class Normal {
double std;
template<typename RNG>
double random (RNG r);
};
This has two benefits. Generally, I think it offers more flexibility
if the commitment to use particular objects is deferred as late as
possible. Secondly, the mechanism to use a shared or non-shared RNG
is simplified. While blitz has a mechanism to do this, I believe a
good argument could be made that this is a lot simpler. Third, if you
need to coordinate sharing a RNG with a class that is not part of
blitz, this method is again simple.
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