vector_gen.cpp

template<typename SizeGenerator, typename ValueGenerator>
auto vector_gen(SizeGenerator size_gen, ValueGenerator value_gen)
{
   return [=](std::mt19937& bit_gen)
   {
      int count = size_gen(bit_gen);
      std::vector<decltype(value_gen(bit_gen))> out;
      out.reserve(count);
      details::repeat_n_gen(std::back_inserter(out), count, value_gen, bit_gen);
      return out;
   };
}

template<typename ValueGenerator>
auto vector_gen(int max_size, ValueGenerator value_gen)
{
   return vector_gen(int_gen(0, max_size), value_gen);
}