An object uses the Integer Flag and its methods to calculator it.

Features

• Create the integer flag as an object.
• Merge multi-state as the only one flag.
• Extract and check the flag states.

Getting started

Add bit_flag into the dependencies:

dependencies:
  bit_flag: ^1.0.0

Usage

import 'package:bit_flag/bit_flag.dart';

void main() {
  const enable = BitFlag(b0001); //0b0001 - The first bit is 1.
  const disable = BitFlag.not(enable); //0┆0b0001 - The first bit is 0;
  const waiting = BitFlag(1, bitOffset: 1); //0b0010 - The second bit is 1
  const done =
  BitFlag.not(BitFlag(1, bitOffset: 1)); //0┆0b0010 - The second bit is 0
  const success = BitFlag(1, bitOffset: 2); //0b0100 - The third bit is 1
  const failed =
  BitFlag.not(BitFlag(1, bitOffset: 2)); //0┆0b0100 - The third bit is 0

  final flag = enable | done | success; //0b0101
  print(flag.hasFlag(enable)); // true
  print(flag.hasFlag(disable)); // false => !flag.hasFlag(enable)
  print(flag.hasFlag(success | done)); // true

  switch (flag.extract(BitFlag.binary(0110))) {
    case const BitFlag.binary(0110): // success and waiting
      print('success and waiting');
      break;
    case const BitFlag.binary(0100): // success and done
      print('success and done');
      break;
    case const BitFlag.binary(0000): // failed and done
      print(' failed and done');
      break;
    case const BitFlag.binary(0010): // failed and waiting
      print('failed and waiting');
      break;
    default:
      print('unknown');
  }
}

Features and bugs

Please file feature requests and bugs at the issue tracker.