core/test_rng.cpp


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#include <assert.h>
#include <iostream>

#include "rng.hpp"

using namespace RNG;
//using namespace std;

int main() {
  seed_t src(0),
    s( split(src)), 
    s1(split(next(src)));

  std::cout << "RNG size: " << sizeof(generator) << std::endl;
  // for (int j=0; j<10; j++) {
  //   s = j;
  //   for (int i=0; i<10; i++) {
  //     std::cout << s << ", ";
  //     s = next(s);
  //   }
  //   std::cout << std::endl;
  // }

  // determinism?
  assert(next(s).rng == next(s).rng);

  // respect seed
  assert(next(s).rng != next(s1).rng);

  // respect equipropable distribution
  {
    const int times(1000);
    double mean(0);
    for (int i=0; i<times; i++) {
      double res = equi(s);
      //      std::cout << res << std::endl;

      s = next(s);
      assert(0 <= res);
      assert(res < 1);
      mean += res;
    }
    mean /= times;
    assert(0.45 < mean && mean < 0.55);
  }

  // respect exponential distribution
  {
    const int times(1000);
    double mean(0);
    for (int i=0; i<times; i++) {
      double res = expo(s, 66);
      //      std::cout << res << " " << s.rng << std::endl;
      s = next(s);
      assert(0 <= res);
      mean += res;
    }
    mean /= times;
    assert(60 < mean && mean < 75);
  }

  // print 1000 parallel streams
  // for (int i=0; i<1000; i++) {
  //   seed_t s = split(src);
  //   src = next(src, 40);
    
  //   double d = 0;
  //   while (d < 100) {
  //     std::cerr << d << "\t" << i << std::endl;
  //     d += expo(s, 1.0);
  //     s = next(s);
  //   }
  // }

  return 0;
}