chore: import upstream snapshot with attribution

paddle/ap/include/axpr/class_instance.h

@@ -0,0 +1,58 @@
+// Copyright (c) 2024 PaddlePaddle Authors. All Rights Reserved.
+//
+// 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 <unordered_map>
+#include "paddle/ap/include/axpr/adt.h"
+#include "paddle/ap/include/axpr/class_attrs.h"
+#include "paddle/ap/include/axpr/error.h"
+#include "paddle/ap/include/axpr/instance_attrs.h"
+#include "paddle/ap/include/axpr/serializable_value.h"
+#include "paddle/ap/include/axpr/type.h"
+
+namespace ap::axpr {
+
+template <typename ValueT>
+struct ClassInstance;
+
+template <typename ValueT>
+struct TypeImpl<ClassInstance<ValueT>> {
+  explicit TypeImpl<ClassInstance<ValueT>>(
+      const ClassAttrs<SerializableValue>& class_attr_val)
+      : class_attrs(class_attr_val) {}
+
+  ClassAttrs<SerializableValue> class_attrs;
+
+  const std::string& Name() const { return class_attrs->Name(); }
+
+  bool operator==(const TypeImpl<ClassInstance<ValueT>>& other) const {
+    return this->class_attrs == other.class_attrs;
+  }
+};
+
+template <typename ValueT>
+struct ClassInstanceImpl {
+  TypeImpl<ClassInstance<ValueT>> type;
+  InstanceAttrs<ValueT> instance_attrs;
+
+  bool operator==(const ClassInstanceImpl& other) const {
+    return this == &other;
+  }
+};
+
+template <typename ValueT>
+ADT_DEFINE_RC(ClassInstance, ClassInstanceImpl<ValueT>);
+
+}  // namespace ap::axpr