std::bernoulli_distribution(3)

NAME
std::bernoulli_distribution - std::bernoulli_distribution

Synopsis
   Defined in header <random>
   class bernoulli_distribution; (since C++11)
   Produces random boolean values, according to the discrete probability function. The
   probability of true is
           P(b|p) =⎧
           ⎨
                        ⎩p if b == true
           1 − p if b == false
   std::bernoulli_distribution satisfies RandomNumberDistribution

Member types
   Member type Definition
   result_type bool
   param_type(C++11) the type of the parameter set, see RandomNumberDistribution.

Member functions
   constructor constructs new distribution
   (C++11) (public member function)
   reset resets the internal state of the distribution
   (C++11) (public member function)

Generation
   operator() generates the next random number in the distribution
   (C++11) (public member function)

Characteristics
   p returns the p distribution parameter (probability of generating true)
                 (public member function)
   param gets or sets the distribution parameter object
   (C++11) (public member function)
   min returns the minimum potentially generated value
   (C++11) (public member function)
   max returns the maximum potentially generated value
   (C++11) (public member function)

Non-member functions
   operator==
   operator!= compares two distribution objects
   (C++11) (function)
   (C++11)(removed in C++20)
   operator<< performs stream input and output on pseudo-random number
   operator>> distribution
   (C++11) (function template)

Example
// Run this code
 #include <iostream>
 #include <iomanip>
 #include <string>
 #include <map>
 #include <random>
 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)];
     }
     for(auto p : hist) {
         std::cout << std::boolalpha << std::setw(5) << p.first
                   << ' ' << std::string(p.second/500, '*') << '\n';
     }
 }

Possible output:
 false ***************
  true ****

External links
   Weisstein, Eric W. "Bernoulli Distribution." From MathWorld--A Wolfram Web Resource.