#include <initializer_list>
namespace std {
  // uniform random bit generator requirements
  template<class G>
    concept UniformRandomBitGenerator = /*see below*/;
 
  // class template linear_congruential_engine
  template<class UIntType, UIntType a, UIntType c, UIntType m>
  class linear_congruential_engine;
  // class template mersenne_twister_engine
  template<class UIntType, size_t w, size_t n, size_t m, size_t r,
           UIntType a, size_t u, UIntType d, size_t s,
           UIntType b, size_t t, UIntType c, size_t l, UIntType f>
  class mersenne_twister_engine;
  // class template subtract_with_carry_engine
  template<class UIntType, size_t w, size_t s, size_t r>
  class subtract_with_carry_engine;
  // class template discard_block_engine
  template<class Engine, size_t p, size_t r>
  class discard_block_engine;
  // class template independent_bits_engine
  template<class Engine, size_t w, class UIntType>
  class independent_bits_engine;
  // class template shuffle_order_engine
  template<class Engine, size_t k>
  class shuffle_order_engine;
  // engines and engine adaptors with predefined parameters
  using minstd_rand0 = /*see description*/ ;
  using minstd_rand = /*see description*/ ;
  using mt19937 = /*see description*/ ;
  using mt19937_64 = /*see description*/ ;
  using ranlux24_base = /*see description*/ ;
  using ranlux48_base = /*see description*/ ;
  using ranlux24 = /*see description*/ ;
  using ranlux48 = /*see description*/ ;
  using knuth_b = /*see description*/ ;
  using default_random_engine = /*see description*/ ;
  // class random_device
  class random_device;
 
  // class seed_seq
  class seed_seq;
  // function template generate_canonical
  template<class RealType, size_t bits, class URBG>
  RealType generate_canonical(URBG& g);
  // class template uniform_int_distribution
  template<class IntType = int>
  class uniform_int_distribution;
  // class template uniform_real_distribution
  template<class RealType = double>
  class uniform_real_distribution;
  // class bernoulli_distribution
  class bernoulli_distribution;
  // class template binomial_distribution
  template<class IntType = int>
  class binomial_distribution;
  // class template geometric_distribution
  template<class IntType = int>
  class geometric_distribution;
  // class template negative_binomial_distribution
  template<class IntType = int>
  class negative_binomial_distribution;
  // class template poisson_distribution
  template<class IntType = int>
  class poisson_distribution;
  // class template exponential_distribution
  template<class RealType = double>
  class exponential_distribution;
  // class template gamma_distribution
  template<class RealType = double>
  class gamma_distribution;
  // class template weibull_distribution
  template<class RealType = double>
  class weibull_distribution;
  // class template extreme_value_distribution
  template<class RealType = double>
  class extreme_value_distribution;
  // class template normal_distribution
  template<class RealType = double>
  class normal_distribution;
  // class template lognormal_distribution
  template<class RealType = double>
  class lognormal_distribution;
  // class template chi_squared_distribution
  template<class RealType = double>
  class chi_squared_distribution;
  // class template cauchy_distribution
  template<class RealType = double>
  class cauchy_distribution;
  // class template fisher_f_distribution
  template<class RealType = double>
  class fisher_f_distribution;
  // class template student_t_distribution
  template<class RealType = double>
  class student_t_distribution;
  // class template discrete_distribution
  template<class IntType = int>
  class discrete_distribution;
  // class template piecewise_constant_distribution
  template<class RealType = double>
  class piecewise_constant_distribution;
  // class template piecewise_linear_distribution
  template<class RealType = double>
  class piecewise_linear_distribution;
}