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46 lines
1.2 KiB
C++
46 lines
1.2 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// REQUIRES: long_tests
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// <random>
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// template<class IntType = int>
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// class discrete_distribution
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// template<class _URNG> result_type operator()(_URNG& g, const param_type& parm);
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#include <random>
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#include <vector>
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#include <cassert>
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int main()
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{
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{
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typedef std::discrete_distribution<> D;
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typedef D::param_type P;
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typedef std::minstd_rand G;
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G g;
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D d;
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double p0[] = {.3, .1, .6};
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P p(p0, p0+3);
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const int N = 10000000;
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std::vector<D::result_type> u(3);
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for (int i = 0; i < N; ++i)
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{
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D::result_type v = d(g, p);
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assert(0 <= v && v <= 2);
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u[v]++;
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}
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std::vector<double> prob = p.probabilities();
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for (int i = 0; i <= 2; ++i)
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assert(std::abs((double)u[i]/N - prob[i]) / prob[i] < 0.001);
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}
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}
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