ceph/src/boost/libs/random/test/test_uniform_on_sphere.cpp

   1 /* test_uniform_on_sphere.cpp
   2  *
   3  * Copyright Steven Watanabe 2011
   4  * Distributed under the Boost Software License, Version 1.0. (See
   5  * accompanying file LICENSE_1_0.txt or copy at
   6  * http://www.boost.org/LICENSE_1_0.txt)
   7  *
   8  * $Id$
   9  *
  10  */
  11
  12 #include <boost/random/uniform_on_sphere.hpp>
  13 #include <boost/random/uniform_int.hpp>
  14 #include <boost/math/distributions/uniform.hpp>
  15 #include <cmath>
  16
  17 class uniform_on_sphere_test {
  18 public:
  19     typedef double result_type;
  20     uniform_on_sphere_test(int dims, int x, int y)
  21         : impl(dims), idx1(x), idx2(y) {}
  22     template<class Engine>
  23     result_type operator()(Engine& rng) {
  24         const boost::random::uniform_on_sphere<>::result_type& tmp = impl(rng);
  25         // This should be uniformly distributed in [-pi,pi)
  26         return std::atan2(tmp[idx1], tmp[idx2]);
  27     }
  28 private:
  29     boost::random::uniform_on_sphere<> impl;
  30     int idx1, idx2;
  31 };
  32
  33 static const double pi = 3.14159265358979323846;
  34
  35 #define BOOST_RANDOM_DISTRIBUTION uniform_on_sphere_test
  36 #define BOOST_RANDOM_DISTRIBUTION_NAME uniform_on_sphere
  37 #define BOOST_MATH_DISTRIBUTION boost::math::uniform
  38 #define BOOST_RANDOM_ARG1_TYPE double
  39 #define BOOST_RANDOM_ARG1_NAME n
  40 #define BOOST_RANDOM_ARG1_DEFAULT 6
  41 #define BOOST_RANDOM_ARG1_DISTRIBUTION(n) boost::uniform_int<>(2, n)
  42 #define BOOST_RANDOM_DISTRIBUTION_INIT (n, 0, n-1)
  43 #define BOOST_MATH_DISTRIBUTION_INIT (-pi, pi)
  44
  45 #include "test_real_distribution.ipp"