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August 29, 2015 14:00
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A rough HashableWeakRef<T> implementation. Missing many details and cases.
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| using System; | |
| class HashableWeakRef<T> : IEquatable<HashableWeakRef<T>> where T : class | |
| { | |
| private WeakReference weakRef; | |
| public T Target { get { return (T) weakRef.Target; } } | |
| public HashableWeakRef(T target) | |
| { | |
| weakRef = new WeakReference(target); | |
| } | |
| public override int GetHashCode() | |
| { | |
| var tmpTarget = weakRef.Target; | |
| if (tmpTarget == null) { | |
| throw new InvalidOperationException("Can't hash a null weak ref"); | |
| } | |
| return tmpTarget.GetHashCode(); | |
| } | |
| public override bool Equals(object other) | |
| { | |
| if (other is HashableWeakRef<T>) { | |
| return this.Equals((HashableWeakRef<T>) other); | |
| } | |
| return false; | |
| } | |
| public bool Equals(HashableWeakRef<T> other) | |
| { | |
| var tmpOtherTarget = other.weakRef.Target; | |
| var tmpThisTarget = this.weakRef.Target; | |
| if (tmpOtherTarget == null || tmpThisTarget == null) { | |
| throw new ArgumentNullException("Can't compare null weakrefs"); | |
| } | |
| return tmpThisTarget.Equals(tmpOtherTarget); | |
| } | |
| public static bool operator ==(HashableWeakRef<T> a, HashableWeakRef<T> b) | |
| { | |
| var tmpTargetA = (T) a.weakRef.Target; | |
| var tmpTargetB = (T) b.weakRef.Target; | |
| if (tmpTargetA == null || tmpTargetB == null) { | |
| throw new ArgumentNullException("Can't test equality for null weakrefs"); | |
| } | |
| return tmpTargetA == tmpTargetB; | |
| } | |
| public static bool operator !=(HashableWeakRef<T> a, HashableWeakRef<T> b) | |
| { | |
| return !(a == b); | |
| } | |
| } |
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