A generically typed equality comparer implementation based on Lambda expressions (removing the need for an explicit class implementation)

LambdaEqualityComparer

using System;
using System.Collections.Generic;

namespace Comparers
{
    /// <summary>
    /// Implements an equality comparer that allows the method implementations
    /// to be supplied as functions in the constructor, eliminating the need
    /// for a custom class to be implemented.
    /// </summary>
    /// <typeparam name="T">The <see cref="Type"/> to be compared.</typeparam>
    public class LambdaEqualityComparer<T> : IEqualityComparer<T>
    {
        private readonly Func<T, T, bool> _equals;
        private readonly Func<T, int> _getHashCode;

        /// <summary>
        /// Initializes a new instance of the <see cref="LambdaEqualityComparer{T}" /> class using the specified
        /// functional equivalents for the methods defined by <see cref="IEqualityComparer{T}"/>.
        /// </summary>
        /// <param name="equals">The Equals method implementation.</param>
        /// <param name="getHashCode">The GetHashCode method implementation.</param>
        public LambdaEqualityComparer(Func<T, T, bool> @equals, Func<T, int> getHashCode = null)
        {
            _equals = @equals;
            _getHashCode = getHashCode;
        }

        /// <summary>Determines whether the specified objects are equal.</summary>
        /// <param name="x">The first object to compare.</param>
        /// <param name="y">The second object to compare.</param>
        /// <returns>true if the specified objects are equal; otherwise, false.</returns>
        public bool Equals(T x, T y)
        {
            return _equals(x, y);
        }

        /// <summary>Returns a hash code for the specified object.</summary>
        /// <param name="obj">The <see cref="T:System.Object" /> for which a hash code is to be returned.</param>
        /// <returns>A hash code for the specified object.</returns>
        /// <exception cref="T:System.ArgumentNullException">The type of <paramref name="obj" /> is a reference type and <paramref name="obj" /> is null.</exception>
        public int GetHashCode(T obj)
        {
            if (_getHashCode != null)
                return _getHashCode(obj);

            return obj.GetHashCode();
        }
    }
}