Tizen UI Builder with C++ Class

I tried to create a simple Tizen v2.4 UI Builder App using Tizen Studio 1.0.1. The application consists of just a single view with 1 button. In the button's event listener I would like to invoke a new class that is made of C++ code.

void view1_btnTry_onclicked(uib_view1_view_context *vc, Evas_Object *obj, void *event_info)
{
    TestClass* tc = testClassInstance();
}

So I created 1 header file named TestClass.hpp and 1 source file TestClass.cpp. Both of them are placed within the src/event_handler folder.

Here is the content of TestClass.hpp:

#ifndef EVENT_HANDLER_TESTCLASS_HPP_
#define EVENT_HANDLER_TESTCLASS_HPP_

class TestClass
{
public:
    TestClass();
    virtual ~TestClass();
};

TestClass* testClassInstance();

#endif /* EVENT_HANDLER_TESTCLASS_HPP_ */

And this is the content of TestClass.cpp, just a factory method, 1 empty ctor & 1 dtor:

#include <stdlib.h>
#include "TestClass.hpp"

static TestClass* instance;

TestClass* TestClass::testClassInstance()
{
    if(instance == null)
        instance = new TestClass;

    return instance;
}

TestClass::TestClass()
{

}

TestClass::~TestClass()
{

}

#endif /* EVENT_HANDLER_TESTCLASS_HPP_ */

I included the header file in uib_view1_event_handler.c using #import "TestClass.hpp". However when I performed build, these errors occured:

In file included from ../src/event_handler/uib_view1_event_handler.c:11:
../src/event_handler/TestClass.hpp:11:1: error: unknown type name 'class'
class TestClass
^
../src/event_handler/TestClass.hpp:11:16: error: expected ';' after top level declarator
class TestClass

If the header is included somwhere, the error always persist.

I have tried to: Change header extension to .c, change compiler dialect to C++11 standard, and move the include to inc/app_main.h

But the result is still the same. Could you please give some enlightenments?