pasting "," and "typename" does not give a valid preprocessing token

http://www.codeproject.com/KB/cpp/CppDelegateImplementation.aspx?fid=420921&fr=11#xx0xx
看了这篇文章之后，编译了一下，报错，错误信息如题
test.cpp:37:1: pasting "," and "typename" does not give a valid preprocessing token

做了个简单的测试，代码如下：

/*

 定义不同的数字可以使下面的someStruct的() 里支持不同的参数个数

 比如这里定义成2，下面的Some类就相当于

struct Some {

	template<typename A1, typename A2>

	struct someStruct {

		void operator() (A1 a1, A2 a2) const {

		}

	};

};



 如果这里定义成3，下面的Some类就相当于

struct Some {

	template<typename A1, typename A2, typename A3>

	struct someStruct {

		void operator() (A1 a1, A2 a2, A3 a3) const {

		}

	};

};

*/

#define PARAM_COUNT 2  



#define COMPILE_TIME_JOIN(X, Y)	X##Y



#define MAKE_PARAMS1_2(t)    t##1, ##t##2

#define MAKE_PARAMS2_2(t1, t2)   t1##1 t2##1, t1##2 t2##2



#define PARAMS             MAKE_PARAMS2(PARAM_COUNT,A,a)



#define MAKE_PARAMS1(n, t)         COMPILE_TIME_JOIN(MAKE_PARAMS1_, n) (t)

#define MAKE_PARAMS2(n, t1, t2)    COMPILE_TIME_JOIN(MAKE_PARAMS2_, n) (t1, t2)



#define TEMPLATE_PARAMS    MAKE_PARAMS1(2, typename A)



struct Some {

	template<TEMPLATE_PARAMS>

	struct someStruct {

		void operator() (PARAMS) const {

		}

	};

};



int main() {



	return 0;

}

请问是啥道理