std:: uniform_int_distribution
From cppreference.com
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Defined in header
<random>
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template
<
class
IntType
=
int
>
class uniform_int_distribution ; |
(since C++11) | |
Produces random integer values i , uniformly distributed on the closed interval [a, b] , that is, distributed according to the discrete probability function
-
P(i|a,b) =
.1 b − a + 1
std::uniform_int_distribution
satisfies all requirements of
RandomNumberDistribution
.
Template parameters
| IntType | - | The result type generated by the generator. The effect is undefined if this is not one of short , int , long , long long , unsigned short , unsigned int , unsigned long , or unsigned long long . |
Member types
| Member type | Definition |
result_type
(C++11)
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IntType |
param_type
(C++11)
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the type of the parameter set, see RandomNumberDistribution . |
Member functions
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(C++11)
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constructs new distribution
(public member function) |
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(C++11)
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resets the internal state of the distribution
(public member function) |
Generation |
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(C++11)
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generates the next random number in the distribution
(public member function) |
Characteristics |
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(C++11)
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returns the distribution parameters
(public member function) |
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(C++11)
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gets or sets the distribution parameter object
(public member function) |
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(C++11)
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returns the minimum potentially generated value
(public member function) |
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(C++11)
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returns the maximum potentially generated value
(public member function) |
Non-member functions
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(C++11)
(C++11)
(removed in C++20)
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compares two distribution objects
(function) |
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(C++11)
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performs stream input and output on pseudo-random number distribution
(function template) |
Example
This program simulates throwing 6-sided dice .
Run this code
#include <iostream> #include <random> int main() { std::random_device rd; // a seed source for the random number engine std::mt19937 gen(rd()); // mersenne_twister_engine seeded with rd() std::uniform_int_distribution<> distrib(1, 6); // Use distrib to transform the random unsigned int // generated by gen into an int in [1, 6] for (int n = 0; n != 10; ++n) std::cout << distrib(gen) << ' '; std::cout << '\n'; }
Possible output:
1 1 6 5 2 2 5 5 6 2