OperatorsSample/VectorEq class

EquatableObject.cs

using System;
using System.Reflection;

namespace OperatorsLib.Classes
{
	public abstract class EquatableObject
	{
		// ValueType と同様に、すべてのフィールドで等価性を評価します。
		public override bool Equals(object obj)
		{
			var type = GetType();
			if (type != obj?.GetType()) return false;

			foreach (var field in type.GetFields(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic))
				if (!Equals(field.GetValue(this), field.GetValue(obj))) return false;
			return true;
		}

		public override int GetHashCode()
		{
			HashCode hc = default;
			foreach (var field in GetType().GetFields(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic))
				hc.Add(field.GetValue(this));
			return hc.ToHashCode();
		}
	}
}

VectorEq.cs

namespace OperatorsLib.Classes
{
	public class VectorEq : EquatableObject
	{
		public double X { get; }
		public double Y { get; }

		public VectorEq(double x, double y) => (X, Y) = (x, y);
	}
}