Function integer_not_zero

example/metapath_randomwalk.cc:104–107

 */
template <typename T>
static bool integer_not_zero(const char*, T value) {
  if (0 == value) { return false; }
  return true;
}

DEFINE_validator(input,    &string_not_empty);
DEFINE_validator(types,    &string_not_empty);