std::discrete_distribution::probabilities(C++11)

#include <iostream>
#include <vector>
#include <random>

int main()
{
  std::discrete_distribution<> dist = {0.0, 0.1, 0.2, 0.3};

  std::vector<double> prob = dist.probabilities();
  for (double x : prob) {
    std::cout << x << std::endl;
  }
}