make_vector_gen.cpp

template<typename ValueGenerator>
auto make_vector_gen(int max_size, ValueGenerator value_generator)
{
  return [=](std::mt19937& gen) {
    std::uniform_int_distribution<int> distribution (0, max_size);
    std::vector<decltype(value_generator(gen))> out(distribution(gen));
    for (auto& val: out) val = value_generator(gen);
    return out;
  };
}