The best way to have a pointer to several methods - critique requested

Posted by user827992 on Programmers See other posts from Programmers or by user827992
Published on 2012-06-23T20:31:42Z Indexed on 2012/06/23 21:24 UTC
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I'm starting with a short introduction of what i know from the C language:

  • a pointer is a type that stores an adress or a NULL
  • the * operator reads the left value of the variable on its right and use this value as address and reads the value of the variable at that address
  • the & operator generate a pointer to the variable on its right

so i was thinking that in C++ the pointers can work this way too, but i was wrong, to generate a pointer to a static method i have to do this:

#include <iostream>

class Foo{
    public:
    static void dummy(void){ std::cout << "I'm dummy" << std::endl; };
};

int main(){
    void (*p)();
    p = Foo::dummy; // step 1
    p();
    p = &(Foo::dummy); // step 2
    p();
    p = Foo; // step 3
    p->dummy();
    return(0);
}

now i have several questions:

  • why step 1 works
  • why step 2 works too, looks like a "pointer to pointer" for p to me, very different from step 1
  • why step 3 is the only one that doesn't work and is the only one that makes some sort of sense to me, honestly
  • how can i write an array of pointers or a pointer to pointers structure to store methods ( static or non-static from real objects )
  • what is the best syntax and coding style for generating a pointer to a method?

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