std::uniform_int_distribution

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Pseudo-random number generation
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linear_congruential_engine (C++11)
mersenne_twister_engine (C++11)
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Generators
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Uniform distributions
uniform_int_distribution (C++11)
uniform_real_distribution (C++11)
generate_canonical (C++11)
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binomial_distribution (C++11)
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C library
rand
srand
RAND_MAX
 
 
Defined in header <random>
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
.

Contents

[edit] Member types

Member type Definition
result_type IntType
param_type the type of the parameter set, unspecified

[edit] Member functions

constructs new distribution
(public member function)
resets the internal state of the distribution
(public member function)
Generation
generates the next random number in the distribution
(public member function)
Characteristics
returns the a distribution parameter (minimum value)
(public member function)
returns the b distribution parameter (maximum value)
(public member function)
gets or sets the distribution parameter object
(public member function)
returns the minimum potentially generated value
(public member function)
returns the maximum potentially generated value
(public member function)

[edit] Non-member functions

compares two distribution objects
(function)
performs stream input and output on pseudo-random number distribution
(function)

[edit] Example

This program simulates throwing 6-sided dice.

#include <random>
#include <iostream>
 
int main()
{
    std::random_device rd;
    std::mt19937 gen(rd());
    std::uniform_int_distribution<> dis(1, 6);
 
    for (int n=0; n<10; ++n)
        std::cout << dis(gen) << ' ';
    std::cout << '\n';
}

Possible output:

1 1 6 5 2 2 5 5 6 2