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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);
            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.
          
            Defined in the header file boost/range/algorithm/random_shuffle.hpp
          
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.
              distance(rng)
                is less than gen's
                maximum value.
              
            Linear. If !empty(rng), exactly distance(rng) - 1
            swaps are performed.