First commit

Runtime/Models/Slots/SlotConnection.cs

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+using System;
+using UnityEngine;
+
+namespace Misaki.GraphView
+{
+    /// <summary>
+    ///     Represents a connection between two connection ports.
+    /// </summary>
+    [Serializable]
+    public struct SlotConnection : IEquatable<SlotConnection>
+    {
+        [SerializeField] 
+        private SlotData _inputSlotData;
+
+        [SerializeField] 
+        private SlotData _outputSlotData;
+
+        /// <summary>
+        ///     Initializes a new instance of the <see cref="SlotConnection" /> struct.
+        /// </summary>
+        /// <param name="inputSlotData">The input connection port.</param>
+        /// <param name="outputSlotData">The output connection port.</param>
+        public SlotConnection(SlotData inputSlotData, SlotData outputSlotData)
+        {
+            _inputSlotData = inputSlotData;
+            _outputSlotData = outputSlotData;
+        }
+
+        public SlotData InputSlotData => _inputSlotData;
+        public SlotData OutputSlotData => _outputSlotData;
+
+        public bool Equals(SlotConnection other)
+        {
+            return _inputSlotData.Equals(other._inputSlotData) && _outputSlotData.Equals(other._outputSlotData);
+        }
+
+        public override bool Equals(object obj)
+        {
+            return obj is SlotConnection other && Equals(other);
+        }
+
+        public override int GetHashCode()
+        {
+            return HashCode.Combine(InputSlotData, OutputSlotData);
+        }
+    }
+}