PseudoFile.readOnlyStr constructor

*[<Null safety>](https://dart.dev/null-safety)*

PseudoFile.readOnlyStr(ReadFnStr fn)

See #readOnly(). Wraps the callback, allowing it to return a String instead of a Uint8List, but otherwise behaves identical to #readOnly().

Implementation

PseudoFile.readOnlyStr(ReadFnStr fn)
    : _capacity = 0,
      assert(fn != null) {
  _readFn = _getReadFn(fn);
}