template< class IntType = int >
class discrete_distribution;
std::discrete_distribution produces random integers on the interval [â0â, n), where the probability of each individual integer i is defined as wi/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.
result_type (C++11) IntType param_type (C++11) the type of the parameter set, see RandomNumberDistribution. [edit] Member functions constructs new distribution
#include <iomanip>
#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> map;
for (int n = 0; n < 1e4; ++n)
++map[d(gen)];
for (const auto& [num, count] : map)
std::cout << num << " generated " << std::setw(4) << count << " times\n";
}
Possible output:
0 generated 4037 times 1 generated 962 times 2 generated 1030 times 3 generated 3971 times
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