# 26 Numerics library [numerics]

## 26.5 Random number generation [rand]

### 26.5.8 Random number distribution class templates [rand.dist]

#### 26.5.8.2.1 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
typedef IntType result_type;
typedef unspecified param_type;

// 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 URNG>
result_type operator()(URNG& g);
template<class URNG>
result_type operator()(URNG& 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.