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std::discrete_distribution<IntType>:: probabilities

From cppreference.net
C++
Numerics library
Pseudo-random number generation
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std::discrete_distribution
std:: vector < double > probabilities ( ) const ;
(since C++11)

Obtains a std:: vector < double > containing the individual probabilities of each integer that is generated by this distribution.

Parameters

(none)

Return value

An object of type std:: vector < double > .

Example

Run this code 
#include <iostream>
#include <random>
#include <vector>
int main()
{
    std::discrete_distribution<> d({40, 10, 10, 40});
    std::vector<double> p = d.probabilities();
    for (auto n : p)
        std::cout << n << ' ';
    std::cout << '\n';
}

Output: 

0.4 0.1 0.1 0.4