Function StringToNumber

native/thirdpart/flatbuffers/util.h:337–362

// - If the converted value falls out of range of corresponding return type, a
// range error occurs. In this case value MAX(T)/MIN(T) is returned.
template<typename T> inline bool StringToNumber(const char *s, T *val) {
  // Assert on `unsigned long` and `signed long` on LP64.
  // If it is necessary, it could be solved with flatbuffers::enable_if<B,T>.
  static_assert(sizeof(T) < sizeof(int64_t), "unexpected type T");
  FLATBUFFERS_ASSERT(s && val);
  int64_t i64;
  // The errno check isn't needed, will return MAX/MIN on overflow.
  if (StringToIntegerImpl(&i64, s, 0, false)) {
    const int64_t max = (flatbuffers::numeric_limits<T>::max)();
    const int64_t min = flatbuffers::numeric_limits<T>::lowest();
    if (i64 > max) {
      *val = static_cast<T>(max);
      return false;
    }
    if (i64 < min) {
      // For unsigned types return max to distinguish from
      // "no conversion can be performed" when 0 is returned.
      *val = static_cast<T>(flatbuffers::is_unsigned<T>::value ? max : min);
      return false;
    }
    *val = static_cast<T>(i64);
    return true;
  }
  *val = 0;
  return false;
}

template<> inline bool StringToNumber<int64_t>(const char *str, int64_t *val) {
  return StringToIntegerImpl(val, str);