std::bernoulli_distribution - cppreference.com (original) (raw)
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) =⎧
⎨
⎩p, if b is true
1 − p, if b is false
std::bernoulli_distribution satisfies RandomNumberDistribution.
Contents
[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
| (constructor)(C++11) | constructs new distribution (public member function) [edit] |
|---|---|
| reset(C++11) | resets the internal state of the distribution (public member function) [edit] |
| Generation | |
| operator()(C++11) | generates the next random number in the distribution (public member function) [edit] |
| Characteristics | |
| p(C++11) | returns the p distribution parameter (probability of generating true) (public member function) [edit] |
| param(C++11) | gets or sets the distribution parameter object (public member function) [edit] |
| min(C++11) | returns the minimum potentially generated value (public member function) [edit] |
| max(C++11) | returns the maximum potentially generated value (public member function) [edit] |
[edit] Non-member functions
[edit] Example
#include #include #include #include #include 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 ****