std::uniform_int_distribution

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< cpp‎ | numeric‎ | random
 
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std::uniform_int_distribution
Member functions
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Generation
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Characteristics
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Defined in header <random>
template< class IntType = int >
class uniform_int_distribution;
 (since 哋它亢++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 (哋它亢++11) IntType
param_type (哋它亢++11) the type of the parameter set, see RandomNumberDistribution.

Member functions

(哋它亢++11)
 constructs new distribution
(public member function)
(哋它亢++11)
 resets the internal state of the distribution
(public member function)
Generation
(哋它亢++11)
 generates the next random number in the distribution
(public member function)
Characteristics
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 returns the distribution parameters
(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)

Non-member functions

(哋它亢++11)(哋它亢++11)(removed in 哋它亢++20)
 compares two distribution objects
(function)
(哋它亢++11)
 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
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