# std::shuffle_order_engine

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< cpp‎ | numeric‎ | random

Defined in header `<random>` |  |
template< class Engine, std::size_t K > class shuffle_order_engine; |  | (since C++11)

`shuffle_order_engine` is a random number engine adaptor that shuffles the random numbers generated by the base engine. It maintains a table of size `K` and delivers a randomly selected number from that table when requested, replacing it with a number generated by the base engine.

The following typedef defines the random number engine with one commonly used parameter set:

Defined in header `<random>`
Type | Definition
`knuth_b` | std::shuffle_order_engine<std::minstd_rand0, 256>

### Template parameters

Engine | - | the type of the wrapped engine
K | - | the size of the internal table. Must be greater than 0
Type requirements
- `Engine` must meet the requirements of `RandomNumberEngine`.

### Member types

Member type | Definition
`result_type` | `Engine::result_type`

### Member functions

(constructor) | constructs the engine adaptor (public member function)
seed | sets the state of the underlying engine (public member function)
base | returns the underlying engine (public member function)

##### Generation

operator() | advances the state of the underlying engine and returns the generated value (public member function)
discard | advances the adaptor's state by a specified amount (public member function)

##### Characteristics

min [static] | gets the smallest possible value in the output range of the underlying engine. (public static member function)
max [static] | gets the largest possible value in the output range of the underlying engine. (public static member function)

### Non-member functions

operator==operator!= | compares the internal states of the adaptors and underlying engines (function)
operator<<operator>> | performs stream input and output on pseudo-random number engine adaptor (function)

### Member objects

constexpr size_t table_size [static] | the size of the internal table, `K` (public static member constant)

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