Method get_filled_hash_map

tests/utils.h:241–253

template <typename HMap>
inline HMap utils::get_filled_hash_map(std::size_t nb_elements) {
  using key_tt = typename HMap::key_type;
  using value_tt = typename HMap::mapped_type;

  HMap map;
  map.reserve(nb_elements);

  for (std::size_t i = 0; i < nb_elements; i++) {
    map.insert({utils::get_key<key_tt>(i), utils::get_value<value_tt>(i)});
  }

  return map;
}

template <class T>
struct is_pair : std::false_type {};