C / C++ / MFC

protected:
	virtual int_type uflow()
	{
		int_type v = base_type::uflow();
		count_ += egptr() - gptr();
		int p = count_ * 40 / size_;
		if (p > prev_perc_)
		{
			std::cout << "*";
			prev_perc_ = p;
		}
		return v;
	}

error C2146: syntax error : missing ';' before identifier 'uflow'
error C2433: 'TestGUIApp::int_type' : 'virtual' not permitted on data declarations
error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
warning C4183: 'uflow': missing return type; assumed to be a member function returning 'int'
error C2065: 'int_type' : undeclared identifier
error C2146: syntax error : missing ';' before identifier 'v'
error C2065: 'v' : undeclared identifier
error C2653: 'base_type' : is not a class or namespace name
error C3861: 'egptr': identifier not found
error C3861: 'gptr': identifier not found