551d8e4ddb
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@104103 91177308-0d34-0410-b5e6-96231b3b80d8
44 lines
1.2 KiB
C++
44 lines
1.2 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// <random>
|
|
|
|
// template<class IntType = int>
|
|
// class discrete_distribution
|
|
|
|
// template<class _URNG> result_type operator()(_URNG& g, const param_type& parm);
|
|
|
|
#include <random>
|
|
#include <vector>
|
|
#include <cassert>
|
|
|
|
int main()
|
|
{
|
|
{
|
|
typedef std::discrete_distribution<> D;
|
|
typedef D::param_type P;
|
|
typedef std::minstd_rand G;
|
|
G g;
|
|
D d;
|
|
double p0[] = {.3, .1, .6};
|
|
P p(p0, p0+3);
|
|
const int N = 10000000;
|
|
std::vector<D::result_type> u(3);
|
|
for (int i = 0; i < N; ++i)
|
|
{
|
|
D::result_type v = d(g, p);
|
|
assert(0 <= v && v <= 2);
|
|
u[v]++;
|
|
}
|
|
std::vector<double> prob = p.probabilities();
|
|
for (int i = 0; i <= 2; ++i)
|
|
assert(std::abs((double)u[i]/N - prob[i]) / prob[i] < 0.001);
|
|
}
|
|
}
|