WrapperEqualityComparer.cs

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using System.Collections.Generic;
 
namespace System.Linq.Parallel;
 
internal struct WrapperEqualityComparer<T> : IEqualityComparer<Wrapper<T>>
{
    private readonly IEqualityComparer<T> _comparer;
 
    internal WrapperEqualityComparer(IEqualityComparer<T> comparer)
    {
        if (comparer == null)
        {
            _comparer = EqualityComparer<T>.Default;
        }
        else
        {
            _comparer = comparer;
        }
    }
 
    public bool Equals(Wrapper<T> x, Wrapper<T> y)
    {
        return _comparer.Equals(x.Value, y.Value);
    }
 
    public int GetHashCode(Wrapper<T> x)
    {
        T value = x.Value;
        if (value != null)
        {
            return _comparer.GetHashCode(value);
        }
        return 0;
    }
}