permutation_generator.hpp

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#include <random>
#include <vector>

namespace iroha {

  using RandomEngine = std::mt19937_64;

  RandomEngine makeSeededPrng(const char *seed_start, size_t seed_length);

  RandomEngine makeSeededPrng(const unsigned char *seed_start,
                              size_t seed_length);

  class Seeder {
   public:
    using ValueType = RandomEngine::result_type;

    Seeder();

    RandomEngine makePrng() const;

    Seeder &feed(const char *seed_start, size_t seed_length);

    Seeder &feed(ValueType value);

   protected:
    ValueType current_seed_;
  };

  void generatePermutation(std::vector<size_t> &permutation,
                           RandomEngine prng,
                           size_t size);
}  // namespace iroha