26 Numerics library [numerics]

26.6 Random number generation [rand]

26.6.8 Random number distribution class templates [rand.dist]

26.6.8.2 Uniform distributions [rand.dist.uni]

26.6.8.2.1 Class template uniform_int_distribution [rand.dist.uni.int]

A uniform_int_distribution random number distribution produces random integers i, aib , distributed according to the constant discrete probability function P(i | a,b) = 1 / (b - a + 1) .

template<class IntType = int>
 class uniform_int_distribution{
public:
 // types
 using result_type = IntType;
 using param_type  = unspecified;

 // constructors and reset functions
 explicit uniform_int_distribution(IntType a = 0, IntType b = numeric_limits<IntType>::max());
 explicit uniform_int_distribution(const param_type& parm);
 void reset();

 // generating functions
 template<class URBG>
   result_type operator()(URBG& g);
 template<class URBG>
   result_type operator()(URBG& g, const param_type& parm);

 // property functions
 result_type a() const;
 result_type b() const;
 param_type param() const;
 void param(const param_type& parm);
 result_type min() const;
 result_type max() const;
};

explicit uniform_int_distribution(IntType a = 0, IntType b = numeric_limits<IntType>::max());

Requires: ab .

Effects: Constructs a uniform_int_distribution object; a and b correspond to the respective parameters of the distribution.

result_type a() const;

Returns: The value of the a parameter with which the object was constructed.

result_type b() const;

Returns: The value of the b parameter with which the object was constructed.