1//===----------------------------------------------------------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is dual licensed under the MIT and the University of Illinois Open 6// Source Licenses. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// REQUIRES: long_tests 11 12// <random> 13 14// template<class IntType = int> 15// class discrete_distribution 16 17// template<class _URNG> result_type operator()(_URNG& g, const param_type& parm); 18 19#include <random> 20#include <vector> 21#include <cassert> 22 23int main() 24{ 25 { 26 typedef std::discrete_distribution<> D; 27 typedef D::param_type P; 28 typedef std::minstd_rand G; 29 G g; 30 D d; 31 double p0[] = {.3, .1, .6}; 32 P p(p0, p0+3); 33 const int N = 10000000; 34 std::vector<D::result_type> u(3); 35 for (int i = 0; i < N; ++i) 36 { 37 D::result_type v = d(g, p); 38 assert(0 <= v && v <= 2); 39 u[v]++; 40 } 41 std::vector<double> prob = p.probabilities(); 42 for (int i = 0; i <= 2; ++i) 43 assert(std::abs((double)u[i]/N - prob[i]) / prob[i] < 0.001); 44 } 45} 46