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Showing content from https://cplusplus.com/reference/random/shuffle_order_engine/ below:

class template

std::shuffle_order_engine

template <class Engine, size_t k> class shuffle_order_engine;

Shuffle-order random number engine adaptor

An engine adaptor class template that adapts a pseudo-random number generator Engine type so that the numbers are delivered in a different sequence.

The object keeps a buffer of k generated numbers internally, and when requested, returns a randomly selected number within the buffer, replacing it with a value obtained from its base engine.

Template parameters

Engine: A random number engine type. All standard generators, except random_device, are random number engine types.
k: Table size: Number of elements in the buffer table.
This parameter should be greater than zero.
size_t is an unsigned integral type.

Member types The following alias is a member type of independent_bits_engine:

member type definition notes result_type Engine::result_type The type of the numbers generated.

Member functions

(constructor): Construct shuffle-order engine (public member function)

min: Minimum value (public static member function)

max: Maximum value (public static member function)

seed: Seed base engine (public member function)

operator(): Generate random number (public member function)

discard: Advance internal state (public member function)

base: Return base engine (public member function)

Non-member functions

operator>>: Extract from input stream (function template)

operator<<: Insert into output stream (function template)

relational operators: Relational operators (function template)

Member constexpr constants member constant definition notes table_size The second template parameter (k) The size of the buffer table.