string_generator.cpp

template<typename SizeGenerator, typename CharGenerator>
auto string_gen(SizeGenerator size_gen, CharGenerator char_generator)
{
   return [=](std::mt19937& bit_gen) -> std::string
   {
      std::string out(size_gen(bit_gen), ' ');
      details::repeat_n_gen(out.begin(), out.size(), char_generator, bit_gen);
      return out;
   };
}

template<typename CharGenerator>
auto string_gen(int max_size, CharGenerator char_generator)
{
   return string_gen(int_gen(0, max_size), char_generator);
}