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//
// Pair.cs
//
// Authors:
// Alexander Chebaturkin (chebaturkin@gmail.com)
//
// Copyright (C) 2011 Alexander Chebaturkin
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
namespace Mono.CodeContracts.Static.DataStructures {
class Pair<K, V> : IEquatable<Pair<K, V>> {
private static readonly bool KeyIsReferenceType = default(K) == null;
private static readonly bool ValueIsReferenceType = default(V) == null;
public readonly K Key;
public readonly V Value;
public Pair (K key, V value)
{
this.Key = key;
this.Value = value;
}
#region IEquatable<Pair<K,V>> Members
public bool Equals (Pair<K, V> other)
{
var keyEquatable = ((object) this.Key) as IEquatable<K>;
bool keysAreEqual = keyEquatable != null ? keyEquatable.Equals (other.Key) : Equals (this.Key, other.Key);
if (!keysAreEqual)
return false;
var valueEquatable = ((object) this.Value) as IEquatable<V>;
return valueEquatable != null ? valueEquatable.Equals (other.Value) : Equals (this.Value, other.Value);
}
#endregion
public override int GetHashCode ()
{
return (!KeyIsReferenceType || ((object) this.Key) != null ? this.Key.GetHashCode () : 0)
+ 13*(!ValueIsReferenceType || ((object) this.Value) != null ? this.Value.GetHashCode () : 0);
}
public override string ToString ()
{
return string.Format ("({0}, {1})",
(!KeyIsReferenceType || ((object) this.Key) != null) ? this.Key.ToString () : "<null>",
(!ValueIsReferenceType || ((object) this.Value) != null) ? this.Value.ToString () : "<null>");
}
}
static class Pair {
public static Pair<K,V> From<K,V>(K key, V value)
{
return new Pair<K, V> (key, value);
}
}
}
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