[boost] boost::random problem

From: Hugo Duncan (hugoduncan_at_[hidden])
Date: 2003-08-12 11:48:43

Hi,

Trying to use the new random library on borland gives runtime problems.

The following program below gives a constant result of 85.

I have tracked the problem to variate_generator.hpp, where the internal 
engine type is computed

   typedef typename random::detail::engine_helper<have_int, 
want_int>::BOOST_NESTED_TEMPLATE impl<decorated_engine, typename 
Distribution::input_type>::type internal_engine_type;

In the example program it is using uniform_int_float instead of uniform_01 
(engine_helper<false,true> instead of engine_helper<true,false>)

I could patch the engine_helper to work using mpl::bool_, but the 
dependency is probably not wanted?

Regards,
Hugo

#include "boost/random/mersenne_twister.hpp"
#include "boost/random/normal_distribution.hpp"
#include "boost/random/variate_generator.hpp"

#include <iostream>

int main(int,char**)
{
  boost::mt19937 generator;
  boost::normal_distribution<> normal_dist(85,88);
  boost::variate_generator<boost::mt19937&, boost::normal_distribution<> >
    normal(generator, normal_dist);

  for (std::size_t i=0;i<100;++i)
    std::cout << normal() << std::endl;
}