5 // Alexander Chebaturkin (chebaturkin@gmail.com)
7 // Copyright (C) 2011 Alexander Chebaturkin
9 // Permission is hereby granted, free of charge, to any person obtaining
10 // a copy of this software and associated documentation files (the
11 // "Software"), to deal in the Software without restriction, including
12 // without limitation the rights to use, copy, modify, merge, publish,
13 // distribute, sublicense, and/or sell copies of the Software, and to
14 // permit persons to whom the Software is furnished to do so, subject to
15 // the following conditions:
17 // The above copyright notice and this permission notice shall be
18 // included in all copies or substantial portions of the Software.
20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
31 namespace Mono.CodeContracts.Static.DataStructures {
32 class Pair<K, V> : IEquatable<Pair<K, V>> {
33 private static readonly bool KeyIsReferenceType = default(K) == null;
34 private static readonly bool ValueIsReferenceType = default(V) == null;
36 public readonly K Key;
37 public readonly V Value;
39 public Pair (K key, V value)
45 #region IEquatable<Pair<K,V>> Members
46 public bool Equals (Pair<K, V> other)
48 var keyEquatable = ((object) this.Key) as IEquatable<K>;
49 bool keysAreEqual = keyEquatable != null ? keyEquatable.Equals (other.Key) : Equals (this.Key, other.Key);
53 var valueEquatable = ((object) this.Value) as IEquatable<V>;
54 return valueEquatable != null ? valueEquatable.Equals (other.Value) : Equals (this.Value, other.Value);
58 public override int GetHashCode ()
60 return (!KeyIsReferenceType || ((object) this.Key) != null ? this.Key.GetHashCode () : 0)
61 + 13*(!ValueIsReferenceType || ((object) this.Value) != null ? this.Value.GetHashCode () : 0);
64 public override string ToString ()
66 return string.Format ("({0}, {1})",
67 (!KeyIsReferenceType || ((object) this.Key) != null) ? this.Key.ToString () : "<null>",
68 (!ValueIsReferenceType || ((object) this.Value) != null) ? this.Value.ToString () : "<null>");