[section:random_shuffle random_shuffle]

[heading 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);
``

[heading 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.

[heading Definition]

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

[heading 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.

[heading Precondition:]

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


[heading Complexity]

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

[endsect]