this must have been in previous commit

external/metal-cpp/Metal/MTLAllocation.hpp

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+//-------------------------------------------------------------------------------------------------------------------------------------------------------------
+//
+// Metal/MTLAllocation.hpp
+//
+// Copyright 2020-2024 Apple Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+//-------------------------------------------------------------------------------------------------------------------------------------------------------------
+
+#pragma once
+
+#include "MTLDefines.hpp"
+#include "MTLHeaderBridge.hpp"
+#include "MTLPrivate.hpp"
+
+#include <Foundation/Foundation.hpp>
+
+namespace MTL
+{
+class Allocation : public NS::Referencing<Allocation>
+{
+public:
+    NS::UInteger allocatedSize() const;
+};
+
+}
+
+// property: allocatedSize
+_MTL_INLINE NS::UInteger MTL::Allocation::allocatedSize() const
+{
+    return Object::sendMessage<NS::UInteger>(this, _MTL_PRIVATE_SEL(allocatedSize));
+}