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      std::bernoulli_distribution

      From cppreference.com
      <cpp‎ |numeric‎ |random
       
       
       
      Pseudo-random number generation
       
       
      Defined in header<random>
      class bernoulli_distribution;
      (since C++11)

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

      P(b|p) =

      p, ifb istrue
      1 − p, ifb isfalse

      std::bernoulli_distribution satisfiesRandomNumberDistribution.

      Contents

      [edit]Member types

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

      [edit]Member functions

      constructs new distribution
      (public member function)[edit]
      (C++11)
      resets the internal state of the distribution
      (public member function)[edit]
      Generation
      (C++11)
      generates the next random number in the distribution
      (public member function)[edit]
      Characteristics
      (C++11)
      returns thep distribution parameter (probability of generatingtrue)
      (public member function)[edit]
      (C++11)
      gets or sets the distribution parameter object
      (public member function)[edit]
      (C++11)
      returns the minimum potentially generated value
      (public member function)[edit]
      (C++11)
      returns the maximum potentially generated value
      (public member function)[edit]

      [edit]Non-member functions

      (C++11)(C++11)(removed in C++20)
      compares two distribution objects
      (function)[edit]
      performs stream input and output on pseudo-random number distribution
      (function template)[edit]

      [edit]Example

      Run this code
      #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(autoconst&[key, value]: hist)std::cout<<std::setw(5)<< key<<' '<<std::string(value/500,'*')<<'\n';}

      Possible output:

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

      [edit]External links

      Weisstein, Eric W. "Bernoulli Distribution." From MathWorld — A Wolfram Web Resource.
      Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/numeric/random/bernoulli_distribution&oldid=160787"

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