std::uniform_int_distribution

 

C++

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Technical Specifications

 

Numerics library

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random_device (C++11)

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Uniform distributions

uniform_int_distribution (C++11)

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generate_canonical (C++11)

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seed_seq (C++11)

C library

rand

srand

RAND_MAX

 

std::uniform_int_distribution

Member functions

uniform_int_distribution::uniform_int_distribution

uniform_int_distribution::reset

Generation

uniform_int_distribution::operator()

Characteristics

uniform_int_distribution::auniform_int_distribution::b

uniform_int_distribution::param

uniform_int_distribution::min

uniform_int_distribution::max

Non-member functions

operator==operator!=

operator<<operator>>

 

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

.

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	IntType
param_type	the type of the parameter set, see RandomNumberDistribution.

Member functions

(constructor)	constructs new distribution (public member function)
reset	resets the internal state of the distribution (public member function)
Generation
operator()	generates the next random number in the distribution (public member function)
Characteristics
ab	returns the distribution parameters (public member function)
param	gets or sets the distribution parameter object (public member function)
min	returns the minimum potentially generated value (public member function)
max	returns the maximum potentially generated value (public member function)

Non-member functions

operator==operator!=	compares two distribution objects (function)
operator<<operator>>	performs stream input and output on pseudo-random number distribution (function template)

Example

This program simulates throwing 6-sided dice.

Run this code

#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