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std::bernoulli_distribution - cppreference.com

std::bernoulli_distribution

class bernoulli_distribution;

(since C++11)

Produces random boolean values, according to the discrete probability function. The probability of true is

P(b|p) =â§ â¨ â©p, if b is true 1 â p, if b is false

std::bernoulli_distribution satisfies RandomNumberDistribution.

[edit] Member types Member type Definition result_type (C++11) bool param_type (C++11) the type of the parameter set, see RandomNumberDistribution. [edit] Member functions constructs new distribution
(public member function) [edit] resets the internal state of the distribution
(public member function) [edit] Generation generates the next random number in the distribution
(public member function) [edit] Characteristics returns the p distribution parameter (probability of generating true)
(public member function) [edit] gets or sets the distribution parameter object
(public member function) [edit] returns the minimum potentially generated value
(public member function) [edit] returns the maximum potentially generated value
(public member function) [edit] [edit] Non-member functions [edit] Example

#include <iomanip>
#include <iostream>
#include <map>
#include <random>
#include <string>
 
int main()
{
    std::random_device rd;
    std::mt19937 gen(rd());
    // give "true" 1/4 of the time
    // give "false" 3/4 of the time
    std::bernoulli_distribution d(0.25);
 
    std::map<bool, int> hist;
    for (int n = 0; n < 10000; ++n)
        ++hist[d(gen)];
 
    std::cout << std::boolalpha;
    for (auto const& [key, value] : hist)
        std::cout << std::setw(5) << key << ' '
                  << std::string(value / 500, '*') << '\n';
}

Possible output:

false ***************
 true ****

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