effective C++ item 35 例程编译不通过！求指教！

[Full_Speed_Turbo]

源代码如下：

#include <iostream>
#include <iomanip>
//#include <memory>
#include <functional>
class game_character;
int default_health_calc(const game_character& gc);
class game_character{
public:
	typedef std::tr1::function<int(const game_character&)> health_calc_func;
	explicit game_character(health_calc_func hcf = default_health_calc)
		:health_func(hcf)
	{}
	int health_value()const
	{
		return health_func(*this);
	}
private:
	health_calc_func health_func;
};
short calc_health(const game_character&)
{
	std::cout << "short calc_health() " << std::endl;
	return 0;
}
struct health_calculator{
	int operator()(const game_character&)const
	{
		std::cout << "the struct health_calculator int operator()" << std::endl;
		return 0;
	}
};
class game_level{
public:
	float health(const game_character&) const
	{
		std::cout << "the class game_level float health()" << std::endl;
		return 0;
	}
};
class evil_bad_guy :public game_character{
public:
	explicit evil_bad_guy(health_calc_func hcf = default_health_calc)
	:game_character(hcf)
	{}

};
class eye_candy_character :public game_character{
public:
	explicit eye_candy_character(health_calc_func hcf = default_health_calc)
		:game_character(hcf)
	{}
};

int main()
{
	evil_bad_guy ebg1(calc_health);//short calc_health()
	ebg1.health_value();
	eye_candy_character ecc1(health_calculator());
	//ecc1.health_value();//有错误！the struct health_calculator int operator()
	game_level current_level;
	evil_bad_guy ebg2(std::tr1::bind(&game_level::health, current_level, std::tr1::placeholders::_1));
	ebg2.health_value();//the class game_level float health()
}

ecc1.health_value();这一行有错误，请问是调用格式不对吗？
请各位不吝指教，谢谢！

[梦之安魂曲]

int health_value()const //这里少一个空格     {         return health_func(*this); //const函数内部职能调用const函数。     } 你应该把错误提示信息贴出来，不然别人不好帮你。

[Full_Speed_Turbo]

引用 1 楼 hello_shadow 的回复:

int health_value()const //这里少一个空格     {         return health_func(*this); //const函数内部职能调用const函数。     } 你应该把错误提示信息贴出来，不然别人不好帮你。

错误 1 error C2228: “.health_value”的左边必须有类/结构/联合 c:\users\rong\documents\visual studio 2013\projects\effective_cpp_55\effective_cpp_55\test_item_35_3.cpp 59 2 IntelliSense: 表达式必须包含类类型 c:\Users\rong\Documents\Visual Studio 2013\Projects\Effective_cpp_55\Effective_cpp_55\test_item_35_3.cpp 59

[xiao_hao_2014]

just want to close it !