帮忙看下这个简单问题

[asuccessa]

#include <iostream.h>

class Screen {
public:
typedef Screen& (Screen::*Action)();
static Action Menu[];
/* Action Menu[];
Screen() {
Menu[] = { &Screen::home, &Screen::forward, &Screen::back, &Screen::up, &Screen::down };
}*/
Screen& home(){return *this;}
Screen& forward(){return *this;}
Screen& back(){return *this;}
Screen& down(){return *this;}
Screen& up(){return *this;}

public:
enum Directions { HOME, FORWARD, BACK, UP, DOWN };
Screen& move(Directions);
};

Screen::Action Screen::Menu[] = { &Screen::home, &Screen::forward, &Screen::back, &Screen::up, &Screen::down };

Screen& Screen::move(Directions cm)
{
(this->*Menu[cm]) ();
return *this;
}

void main()
{
}

请问为什么static Action Menu[]要为静态的,声明为Action Menu[]怎么出现错误了?

[feng4206yu]

#include <iostream>
using namespace std;
class Screen { 
public: 
	typedef Screen& (Screen::*Action)(); 
	Action Menu[5]; 
//  Action Menu[]; 
	Screen() 
	{ 
		Menu[0] = &Screen::home;
		Menu[1] = &Screen::forward;
		Menu[2] = &Screen::back;
		Menu[3] = &Screen::up;
		Menu[4] = &Screen::down; 
	} 
	Screen& home(){return *this;} 
	Screen& forward(){return *this;} 
	Screen& back(){return *this;} 
	Screen& down(){return *this;} 
	Screen& up(){return *this;} 
	
public: 
	enum Directions { HOME, FORWARD, BACK, UP, DOWN }; 
	Screen& move(Directions); 
}; 

// Screen::Action Screen::Menu[] = { &Screen::home, &Screen::forward, &Screen::back, &Screen::up, &Screen::down }; 

Screen& Screen::move(Directions cm) 
{ 
	(this->*Menu[cm]) (); 
	return *this; 
} 

void main() 
{ 
} 

这样可以通过编译....

[waizqfor]

[Quote=引用楼主 asuccessa 的帖子:]
#include <iostream.h>

class Screen {
public:
typedef Screen& (Screen::*Action)();
static Action Menu[];
/* Action Menu[];
Screen() {
Menu[] = { &Screen::home, &Screen::forward, &Screen::back, &Screen::up, &Screen::down };
}*/
Screen& home(){return *this;}
Screen& forward(){return *this;}
Screen& back(){return *this;}
Screen& down(){return *this;}
Screen& up(){return *…
[/Quote]
LZ看看静态成员函数的使用方法吧 声明什么的
http://topic.csdn.net/u/20090214/22/3f6bae8b-df3c-4675-9b90-f06bfe467694.htmlLZ看看评论

[ysysbaobei]

顶

[猫已经找不回了]

[Quote=引用 3 楼 hqin6 的回复:]
C/C++ code请问为什么static Action Menu[]要为静态的,声明为Action Menu[]怎么出现错误了?


简单的说，静态的能知道大小，非静态的数组成员，不知道大小

如果像1l说的，给数组一个大小，知道数组大小，就知道该数据成员大小，所以能通过
[/Quote]
说的好，楼主可以区看看这个帖。
http://hi.baidu.com/wangyu_nick/blog/item/ffd38f1fabc908f3e1fe0b40.html

[太乙]

请问为什么static Action Menu[]要为静态的,声明为Action Menu[]怎么出现错误了?


简单的说，静态的能知道大小，非静态的数组成员，不知道大小

如果像1l说的，给数组一个大小，知道数组大小，就知道该数据成员大小，所以能通过