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diff --git a/tools/intergen/model/include/model/function.h b/tools/intergen/model/include/model/function.h
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+++ b/tools/intergen/model/include/model/function.h
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+/**
+ * Copyright (c) 2014, Ford Motor Company
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following
+ * disclaimer in the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * Neither the name of the Ford Motor Company nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef FUNCTION_H_
+#define FUNCTION_H_
+#include <map>
+#include <string>
+
+#include "model/constant.h"
+#include "model/scope.h"
+#include "model/type.h"
+#include "utils/common_types.h"
+#include "utils/macro.h"
+#include "utils/stl_utils.h"
+
+namespace codegen {
+class Interface;
+
+/*
+ * Class representing single RPC message and it's parameters,
+ * can be request, response or notification.
+ * Message parameters are passed as structures so message is based
+ * on it's implementation
+ */
+class FunctionMessage: public Struct {
+ public:
+  // Types
+  enum MessageType {
+    kRequest,
+    kResponse,
+    kNotification,
+    kUnknownMessageType
+  };
+  // Procudes string given MessageType to be used in class names
+  static const char* MessageTypeToString(MessageType message_type);
+
+  // Message parameters are passed as structs so every parameter
+  // is a struct field
+  typedef Field Parameter;
+  typedef FieldsList ParametersList;
+ public:
+  // Methods
+
+  // Returns message type named by string literal.
+  // Return kUnknownMessageType if literal names unknown message type
+  static MessageType MessageTypeFromLiteral(const std::string& literal);
+  // Creates Function message and associates it with given |interface|
+  FunctionMessage(const Interface* interface, const std::string& name,
+                  const Enum::Constant* id, MessageType message_type,
+                  const Description& description, Scope scope);
+  ~FunctionMessage();
+  // Returns function ID which is one of the "FunctionID" enum constants
+  const Enum::Constant* id() const;
+  // List of function parameters
+  const ParametersList& parameters() const;
+  // Constructs message parameter and stores it
+  bool AddParameter(const std::string& name, const Type* type,
+                    const Constant* default_value, bool is_mandatory,
+                    const Description& description, Scope scope,
+                    Platform platform);
+  const Interface* interface() const;
+
+private:
+  const Interface* interface_;
+  const Enum::Constant* id_;
+  MessageType message_type_;
+  DISALLOW_COPY_AND_ASSIGN(FunctionMessage);
+};
+
+typedef FunctionMessage Request;
+typedef FunctionMessage Response;
+typedef FunctionMessage Notification;
+
+/*
+ * A container that bounds a request type to it's corresponding response
+ * type
+ */
+class Function {
+ public:
+  Function(const Request* request, const Response* response);
+
+  const Request& request() const {
+    return *request_;
+  }
+
+  const Response& response() const {
+    return *response_;
+  }
+
+ private:
+  const Request* request_;
+  const Response* response_;
+};
+
+}  // namespace codegen
+
+#endif /* FUNCTION_H_ */