[boost] Re: random.hpp - suggestion for utility function

From: michael toksvig (michaeltoksvig_at_[hidden])
Date: 2005-05-23 15:29:36

you really want to make some of those local variables static or you will get 
decidedly unrandom behaviour :-)

regards,

/michael toksvig

"christopher diggins" <cdiggins_at_[hidden]> wrote in message 
news:001e01c55fd1$393e6080$2b792518_at_heronnest...
> AFAICT the shortest way to emulate the std::rand() function using 
> boost/random.hpp would be as follows:
>
>  unsigned int longhand_boost_rand() {
>    boost::mt19937 rng;
>    boost::uniform_int<> dist(0, RAND_MAX);
>    boost::variate_generator
>    <
>      boost::mt19937,
>      boost::uniform_int<>
>    > generator(rng, dist);
>    return generator();
>  }
>
> (apologies if I made any mistakes)
>
> I was wondering if there would be any reason not to provide a utility 
> function which made it easier to write random number generators. For 
> instance, the following:
>
>  template<class Dist_T, class Rng_T>
>  typename boost::variate_generator<Rng_T, Dist_T>::result_type
>  generate_rand(Dist_T dist, Rng_T rng) {
>    return boost::variate_generator<Rng_T, Dist_T>(rng, dist)();
>  }
>
> would allow us to rewrite our rand function as follows.
>
>  unsigned int shorthand_boost_rand() {
>    return generate_rand(boost::uniform_int<>(0, RAND_MAX), 
> boost::mt19937());
>  }
>
> By the way, congratulations on an excellent product to the random.hpp 
> team.
>
> --
> Christopher Diggins
> http://www.cdiggins.com
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