why it needs a copy ctor? why make copy constructor "protected"

I had a interview before?

my answer was just the same as yours. I passed.

it's something like the one below: (something wrong????)

class Singleton {
public:
static Singleton* Instance();
static proof(void);
protected:
Singleton();
private:
static Singleton* _singleton;
};

所有跟帖: 

the interviewer said -吴用先生- 给 吴用先生 发送悄悄话 (186 bytes) () 03/05/2009 postreply 12:31:48

ok. -戏雨飞鹰- 给 戏雨飞鹰 发送悄悄话 戏雨飞鹰 的博客首页 (0 bytes) () 03/05/2009 postreply 12:40:14

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