lib/src/tuple.dart

// Copied from source at github.com/kseo/tuple/blob/470ed3aeb/lib/src/tuple.dart

// Original copyright:
// Copyright (c) 2014, the tuple project authors. Please see the AUTHORS
// file for details. All rights reserved. Use of this source code is governed
// by a BSD-style license that can be found in the LICENSE file.

/// Represents a 2-tuple, or pair.
class Tuple2<T1, T2> {
  /// Returns the first item of the tuple
  final T1 item1;

  /// Returns the second item of the tuple
  final T2 item2;

  /// Creates a new tuple value with the specified items.
  const Tuple2(this.item1, this.item2);

  @override
  String toString() => '[$item1, $item2]';

  @override
  bool operator ==(Object other) =>
      other is Tuple2 && other.item1 == item1 && other.item2 == item2;

  @override
  int get hashCode => Object.hash(item1, item2);
}

/// Represents a 3-tuple, or triple.
class Tuple3<T1, T2, T3> {
  /// Returns the first item of the tuple
  final T1 item1;

  /// Returns the second item of the tuple
  final T2 item2;

  /// Returns the third item of the tuple
  final T3 item3;

  /// Creates a new tuple value with the specified items.
  const Tuple3(this.item1, this.item2, this.item3);

  @override
  String toString() => '[$item1, $item2, $item3]';

  @override
  bool operator ==(Object other) =>
      other is Tuple3 &&
      other.item1 == item1 &&
      other.item2 == item2 &&
      other.item3 == item3;

  @override
  int get hashCode => Object.hash(item1, item2, item3);
}