poisson_binomial_rng.hpp

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#ifndef STAN_MATH_PRIM_PROB_POISSON_BINOMIAL_RNG_HPP
#define STAN_MATH_PRIM_PROB_POISSON_BINOMIAL_RNG_HPP
 
#include <stan/math/prim/meta.hpp>
#include <stan/math/prim/err.hpp>
#include <stan/math/prim/fun/size.hpp>
#include <boost/random/bernoulli_distribution.hpp>
#include <boost/random/variate_generator.hpp>
 
namespace stan {
namespace math {
 
template <typename T_theta, typename RNG>
inline int poisson_binomial_rng(const T_theta& theta, RNG& rng) {
  static constexpr const char* function = "poisson_binomial_rng";
  ref_type_t<T_theta> theta_ref = theta;
  check_finite(function, "Probability parameters", theta_ref);
  check_bounded(function, "Probability parameters", theta_ref, 0.0, 1.0);
 
  int y = 0;
  for (size_t i = 0; i < theta.size(); ++i) {
    boost::variate_generator<RNG&, boost::bernoulli_distribution<> >
        bernoulli_rng(rng, boost::bernoulli_distribution<>(theta_ref[i]));
    y += bernoulli_rng();
  }
 
  return y;
}
 
}  // namespace math
}  // namespace stan
#endif