std::discrete_distribution

template< class IntType = int >
class discrete_distribution;

std::discrete_distribution produces random integers on the interval [0, n), where the probability of each individual integer i is defined as w
i/S, that is the weight of the ith integer divided by the sum of all n weights.

std::discrete_distribution satisfies all requirements of RandomNumberDistribution.

Template parameters

Member types

Member functions

Non-member functions

Example

#include <iostream>
#include <map>
#include <random>
 
int main()
{
    std::random_device rd;
    std::mt19937 gen(rd());
    std::discrete_distribution<> d({40, 10, 10, 40});
    std::map<int, int> m;
    for(int n=0; n<10000; ++n) {
        ++m[d(gen)];
    }
    for(auto p : m) {
        std::cout << p.first << " generated " << p.second << " times\n";
    }
}

0 generated 4028 times
1 generated 978 times
2 generated 1012 times
3 generated 3982 times