Follow code become compilation error:

#include <random>

int main()
{
  typedef std::negative_binomial_distribution<> dist_type;

  std::default_random_engine engine;

  dist_type dist;
  dist_type::param_type param(3, 0.5);

  int result = dist(engine, param); // compile error!
}


error description:

prog.cc: In function 'int main()':
prog.cc:12:7: warning: unused variable 'result' [-Wunused-variable]
   int result = dist(engine, param); // compile error!
       ^
In file included from /usr/local/gcc-head/include/c++/4.9.0/random:49:0,
                 from prog.cc:1:
/usr/local/gcc-head/include/c++/4.9.0/bits/random.h: In instantiation of 'class std::gamma_distribution<int>':
/usr/local/gcc-head/include/c++/4.9.0/bits/random.tcc:1295:4:   required from 'std::negative_binomial_distribution<_IntType>::result_type std::negative_binomial_distribution<_IntType>::operator()(_UniformRandomNumberGenerator&, const std::negative_binomial_distribution<_IntType>::param_type&) [with _UniformRandomNumberGenerator = std::linear_congruential_engine<long unsigned int, 16807ul, 0ul, 2147483647ul>; _IntType = int; std::negative_binomial_distribution<_IntType>::result_type = int]'
prog.cc:12:34:   required from here
/usr/local/gcc-head/include/c++/4.9.0/bits/random.h:2504:7: error: static assertion failed: template argument not a floating point type
       static_assert(std::is_floating_point<_RealType>::value,
       ^
/usr/local/gcc-head/include/c++/4.9.0/bits/random.h: In instantiation of 'class std::normal_distribution<int>':
/usr/local/gcc-head/include/c++/4.9.0/bits/random.h:2699:45:   required from 'class std::gamma_distribution<int>'
/usr/local/gcc-head/include/c++/4.9.0/bits/random.tcc:1295:4:   required from 'std::negative_binomial_distribution<_IntType>::result_type std::negative_binomial_distribution<_IntType>::operator()(_UniformRandomNumberGenerator&, const std::negative_binomial_distribution<_IntType>::param_type&) [with _UniformRandomNumberGenerator = std::linear_congruential_engine<long unsigned int, 16807ul, 0ul, 2147483647ul>; _IntType = int; std::negative_binomial_distribution<_IntType>::result_type = int]'
prog.cc:12:34:   required from here
/usr/local/gcc-head/include/c++/4.9.0/bits/random.h:2087:7: error: static assertion failed: template argument not a floating point type
       static_assert(std::is_floating_point<_RealType>::value,
       ^
In file included from /usr/local/gcc-head/include/c++/4.9.0/random:51:0,
                 from prog.cc:1:
/usr/local/gcc-head/include/c++/4.9.0/bits/random.tcc: In instantiation of 'std::negative_binomial_distribution<_IntType>::result_type std::negative_binomial_distribution<_IntType>::operator()(_UniformRandomNumberGenerator&, const std::negative_binomial_distribution<_IntType>::param_type&) [with _UniformRandomNumberGenerator = std::linear_congruential_engine<long unsigned int, 16807ul, 0ul, 2147483647ul>; _IntType = int; std::negative_binomial_distribution<_IntType>::result_type = int]':
prog.cc:12:34:   required from here
/usr/local/gcc-head/include/c++/4.9.0/bits/random.tcc:1298:64: error: no match for call to '(std::gamma_distribution<double>) (std::linear_congruential_engine<long unsigned int, 16807ul, 0ul, 2147483647ul>&, param_type)'
    _M_gd(__urng, param_type(__p.k(), (1.0 - __p.p()) / __p.p()));
                                                                ^
In file included from /usr/local/gcc-head/include/c++/4.9.0/random:49:0,
                 from prog.cc:1:
/usr/local/gcc-head/include/c++/4.9.0/bits/random.h:2502:11: note: candidates are:
     class gamma_distribution
           ^
/usr/local/gcc-head/include/c++/4.9.0/bits/random.h:2619:2: note: template<class _UniformRandomNumberGenerator> std::gamma_distribution<_RealType>::result_type std::gamma_distribution<_RealType>::operator()(_UniformRandomNumberGenerator&) [with _UniformRandomNumberGenerator = _UniformRandomNumberGenerator; _RealType = double]
  operator()(_UniformRandomNumberGenerator& __urng)
  ^
/usr/local/gcc-head/include/c++/4.9.0/bits/random.h:2619:2: note:   template argument deduction/substitution failed:
In file included from /usr/local/gcc-head/include/c++/4.9.0/random:51:0,
                 from prog.cc:1:
/usr/local/gcc-head/include/c++/4.9.0/bits/random.tcc:1298:64: note:   candidate expects 1 argument, 2 provided
    _M_gd(__urng, param_type(__p.k(), (1.0 - __p.p()) / __p.p()));
                                                                ^
In file included from /usr/local/gcc-head/include/c++/4.9.0/random:49:0,
                 from prog.cc:1:
/usr/local/gcc-head/include/c++/4.9.0/bits/random.h:2624:2: note: template<class _UniformRandomNumberGenerator> std::gamma_distribution<_RealType>::result_type std::gamma_distribution<_RealType>::operator()(_UniformRandomNumberGenerator&, const std::gamma_distribution<_RealType>::param_type&) [with _UniformRandomNumberGenerator = _UniformRandomNumberGenerator; _RealType = double]
  operator()(_UniformRandomNumberGenerator& __urng,
  ^
/usr/local/gcc-head/include/c++/4.9.0/bits/random.h:2624:2: note:   template argument deduction/substitution failed:
In file included from /usr/local/gcc-head/include/c++/4.9.0/random:51:0,
                 from prog.cc:1:
/usr/local/gcc-head/include/c++/4.9.0/bits/random.tcc:1298:64: note:   cannot convert 'std::gamma_distribution<int>::param_type((& __p)->std::negative_binomial_distribution<_IntType>::param_type::k<int>(), (int)(#'rdiv_expr' not supported by expression#))' (type 'param_type {aka std::gamma_distribution<int>::param_type}') to type 'const std::gamma_distribution<double>::param_type&'
    _M_gd(__urng, param_type(__p.k(), (1.0 - __p.p()) / __p.p()));