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##### random_shuffle

###### Prototype

    template<class RandomAccessRange>
    RandomAccessRange& random_shuffle(RandomAccessRange& rng);

    template<class RandomAccessRange>
    const RandomAccessRange& random_shuffle(const RandomAccessRange& rng);

    template<class RandomAccessRange, class Generator>
    RandomAccessRange& random_shuffle(RandomAccessRange& rng, Generator& gen);

    template<class RandomAccessRange, class Generator>
    const RandomAccessRange& random_shuffle(const RandomAccessRange& rng, Generator& gen);

###### Description

`random_shuffle` randomly rearranges the elements in `rng`. The versions of `random_shuffle` that do not specify a `Generator` use an internal random number generator. The versions of `random_shuffle` that do specify a `Generator` use this instead. Returns the shuffles range.

###### Definition

Defined in the header file `boost/range/algorithm/random_shuffle.hpp`

###### Requirements

For the version without a Generator:

- `RandomAccessRange` is a model of the Random Access Range Concept.

For the version with a Generator:

- `RandomAccessRange` is a model of the Random Access Range Concept.
- `Generator` is a model of the `RandomNumberGeneratorConcept`.
- `RandomAccessRange`'s distance type is convertible to `Generator`'s argument type.

###### Precondition:

- `distance(rng)` is less than `gen`'s maximum value.

###### Complexity

Linear. If `!empty(rng)`, exactly `distance(rng) - 1` swaps are performed.