Defined in header <random>  

template< class IntType = int > class uniform_int_distribution;  (since C++11) 
Produces random integer values \(\small i\)i, uniformly distributed on the closed interval \(\small[a, b]\)[a, b], that is, distributed according to the discrete probability function \({\small P(ia,b) =}\frac{1}{b  a + 1}\)P(ia,b) =
1/b − a + 1.std::uniform_int_distribution
satisfies all requirements of RandomNumberDistribution.
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 type  Definition 

result_type (C++11)  IntType 
param_type (C++11)  the type of the parameter set, see RandomNumberDistribution. 
(C++11)  constructs new distribution (public member function) 
(C++11)  resets the internal state of the distribution (public member function) 
Generation 

(C++11)  generates the next random number in the distribution (public member function) 
Characteristics 

(C++11)  returns the distribution parameters (public member function) 
(C++11)  gets or sets the distribution parameter object (public member function) 
(C++11)  returns the minimum potentially generated value (public member function) 
(C++11)  returns the maximum potentially generated value (public member function) 
(C++11)(C++11)(removed in C++20)  compares two distribution objects (function) 
(C++11)  performs stream input and output on pseudorandom number distribution (function template) 
This program simulates throwing 6sided dice.
#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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