using System;
namespace ln.types
{
	class WeakHashValue<T> where T:class
	{
		readonly int keyHashCode;

		WeakReference<T> reference;

		public T Value => reference.TryGetTarget(out T target) ? target : null;
		public bool IsStrong => reference.TryGetTarget(out T target);

		public WeakHashValue(T value)
		{
			reference = new WeakReference<T>(value);
			keyHashCode = value.GetHashCode();
		}

		public override int GetHashCode() => keyHashCode;
		public override bool Equals(object obj)
		{
			T value = Value;
			if ((value != null) && (obj is WeakHashValue<T>))
			{
				WeakHashValue<T> other = obj as WeakHashValue<T>;
				return object.Equals(value,other.Value);
			}
			return false;
		}
	}
}