std::discrete_distribution
From cppreference.com
Defined in header
<random>
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template< class IntType = int >
class discrete_distribution; |
(since C++11) | |
std::discrete_distribution
produces random integers on the interval [0, n)
, where the probability of each individual integer i
is defined as w
i/S, that is the weight of the i
th integer divided by the sum of all n
weights.
Contents |
[edit] Member types
Member type | Definition |
result_type
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IntType |
param_type
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the type of the parameter set, unspecified |
[edit] Member functions
constructs new distribution (public member function) |
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resets the internal state of the distribution (public member function) |
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Generation |
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generates the next random number in the distribution (public member function) |
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Characteristics |
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obtains the list of probabilities (public member function) |
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gets or sets the distribution parameter object (public member function) |
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returns the minimum potentially generated value (public member function) |
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returns the maximum potentially generated value (public member function) |
[edit] Non-member functions
compares two distribution objects (function) |
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performs stream input and output on pseudo-random number distribution (function) |
[edit] Example
Run this code
#include <iostream> #include <map> #include <random> int main() { std::random_device rd; std::mt19937 gen(rd()); std::discrete_distribution<> d({40, 10, 10, 40}); std::map<int, int> m; for(int n=0; n<10000; ++n) { ++m[d(gen)]; } for(auto p : m) { std::cout << p.first << " generated " << p.second << " times\n"; } }
Output:
0 generated 4028 times 1 generated 978 times 2 generated 1012 times 3 generated 3982 times