// Copyright 2014 The Flutter Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. import '_bitfield_io.dart' if (dart.library.js_util) '_bitfield_web.dart' as bitfield; /// The largest SMI value. /// /// See <https://www.dartlang.org/articles/numeric-computation/#smis-and-mints> /// /// When compiling to JavaScript, this value is not supported since it is /// larger than the maximum safe 32bit integer. const int kMaxUnsignedSMI = bitfield.kMaxUnsignedSMI; /// A BitField over an enum (or other class whose values implement "index"). /// Only the first 62 values of the enum can be used as indices. /// /// When compiling to JavaScript, this class is not supported. abstract class BitField<T extends dynamic> { /// Creates a bit field of all zeros. /// /// The given length must be at most 62. factory BitField(int length) = bitfield.BitField<T>; /// Creates a bit field filled with a particular value. /// /// If the value argument is true, the bits are filled with ones. Otherwise, /// the bits are filled with zeros. /// /// The given length must be at most 62. factory BitField.filled(int length, bool value) = bitfield.BitField<T>.filled; /// Returns whether the bit with the given index is set to one. bool operator [](T index); /// Sets the bit with the given index to the given value. /// /// If value is true, the bit with the given index is set to one. Otherwise, /// the bit is set to zero. void operator []=(T index, bool value); /// Sets all the bits to the given value. /// /// If the value is true, the bits are all set to one. Otherwise, the bits are /// all set to zero. Defaults to setting all the bits to zero. void reset([ bool value = false ]); }