KeyRange.bound 构造函数

KeyRange.bound(
  1. dynamic lower,
  2. dynamic upper,
  3. [bool lowerOpen = false,
  4. bool upperOpen = false]
)

实现

factory KeyRange.bound(/*Key*/ lower, /*Key*/ upper,
        [bool lowerOpen = false, bool upperOpen = false]) =>
    _KeyRangeFactoryProvider.createKeyRange_bound(
        lower, upper, lowerOpen, upperOpen);