/// <summary>
/// Deletes given <paramref name="x"/> from hashqueue.
/// Returns true if successful.
/// </summary>
public bool Delete(T x)
{
Ex.ThrowIfEmpty(IsEmpty(), "HashQueue is empty.");
x.ThrowIfArgumentNull(nameof(x));
if (!Has(x))
{
return(false);
}
dq.Delete(DeleteFromMap(x));
return(true);
}