Source/FisheryLib/FunctionPointers/MethodFactory.cs

@@ -7,7 +7,9 @@ using System.Collections.Concurrent;
 using System.Diagnostics;
 using System.Linq;
 using System.Reflection.Emit;
+using System.Runtime.CompilerServices;
 using System.Security;
+using Verse;
 
 namespace FisheryLib.FunctionPointers;
 
@@ -64,12 +66,18 @@ public abstract class MethodFactory(MethodInfo[] methods, string namePrefix, boo
 		=> type.GetMethods(BindingFlags.Static | BindingFlags.Public | BindingFlags.DeclaredOnly)
 			.Where(predicate).ToArray();
 
+	[MethodImpl(MethodImplOptions.AggressiveInlining)]
+	protected static bool UseReferenceIdentity(Type type)
+		=> !type.IsValueType && typeof(Thing).IsAssignableFrom(type);
+
 	public new class Equals(Type type, string dynamicMethodNamePrefix, bool byRef)
 		: MethodFactory(GetMethodInfoArraySafely(type), dynamicMethodNamePrefix, byRef)
 	{
 		protected override MethodInfo GetOrMakeMethodForType(Type type)
 			=> GetSpecializedMethod(type)
-				?? (type.IsAssignableTo(typeof(IEquatable<>), type)
+				?? (UseReferenceIdentity(type)
+					? GetGeneric(nameof(FunctionPointers.Equals.Methods.Reference), type)
+					: type.IsAssignableTo(typeof(IEquatable<>), type)
 					? GetGeneric(type.IsValueType
 						? nameof(FunctionPointers.Equals.Methods.EquatableValueType)
 						: nameof(FunctionPointers.Equals.Methods.EquatableReferenceType), type)
@@ -235,7 +243,9 @@ public abstract class MethodFactory(MethodInfo[] methods, string namePrefix, boo
 	{
 		protected override MethodInfo GetOrMakeMethodForType(Type type)
 			=> GetSpecializedMethod(type)
-				?? (type.IsNullable(out var genericArgument)
+				?? (UseReferenceIdentity(type)
+					? GetGeneric(nameof(FunctionPointers.GetHashCode.Methods.Reference), type)
+					: type.IsNullable(out var genericArgument)
 					&& genericArgument.IsAssignableTo(typeof(IEquatable<>), genericArgument)
 						? GetGeneric(nameof(FunctionPointers.GetHashCode.Methods.Nullable), genericArgument)
 						: type.IsEnum
@@ -375,4 +385,4 @@ public abstract class MethodFactory(MethodInfo[] methods, string namePrefix, boo
 		private delegate int ByRefHashCodeGetter<T>(ref T arg);
 		private delegate int HashCodeGetter<in T>(T arg);
 	}
-}
+}