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Storing function pointers in a class?

For Beginners

Started by GeekPlusPlus April 05, 2004 05:02 PM

2 comments, last by GeekPlusPlus 20 years ago

GeekPlusPlus

124

Author

April 05, 2004 05:02 PM

Hello, the topic pretty much says it all. I''m curious as to how i''d define a member variable in a class so that I could pass the class a function pointer and it''ll hold that pointer. Hope someone can help. - Newb Programmer: Geek++

- Newb Programmer: Geek++

SiCrane

11,840

April 05, 2004 05:05 PM

Pretty much the same way you put any variable in a class.

class ClassWithFunctionPointer {  public:    typedef void (*void_ptr)(void);    void set_function_pointer(void_ptr ptr) {      my_pointer = ptr;    }  private:    void_ptr my_pointer;};

GeekPlusPlus

124

Author

April 05, 2004 06:35 PM

Ahh, it''s the having to typedef it that was getting me.

Thanks, works like a charm.

- Newb Programmer: Geek++

- Newb Programmer: Geek++

SiCrane

11,840

April 05, 2004 06:56 PM

It''s entirely possible to do it without the typedef - it just looks ugly as sin.

class ClassWithFunctionPointer {  public:    void set_function_pointer(void (*ptr)(void)) {      my_pointer = ptr;    }  private:    void (*my_pointer)(void);};