What is a virtual function pointer?

I think i understand "function pointer": a pointer that points to a function.

Function pointer-questions:
1) Can function pointer point to a static function?
2) Can function pointer point to a member function?
3) Can function pointer point to a virtual member function?
4) Why use function pointer? can i just use if/then to avoid the use of function pointer completely? (because i really am afraid of using function pointer)

generic-questions:
1) how to use ' extern "C" ' ? is it necessary ?
2) Why do we need multiple inheritance?

--TING

You may find some of the answers here:
http://www.google.com/search?q=funct....parashift.com

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1) Can function pointer point to a static function?

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I do not see why not, so I say yes.

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2) Can function pointer point to a member function?
3) Can function pointer point to a virtual member function?

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There are pointers to member functions, but they are not really function pointers.

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4) Why use function pointer? can i just use if/then to avoid the use of function pointer completely? (because i really am afraid of using function pointer)

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Take for example qsort(). You certainly cannot just use if statements to replace passing the comparator function as a function pointer. The std::sort() generic algorithm takes a comparator that behaves like a function: so it could be a function pointer or a function object. In that sense, you can avoid function pointers in such cases by using function objects (possibly with template code).

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1) how to use ' extern "C" ' ? is it necessary ?

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Read the FAQ: How to mix C and C++

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2) Why do we need multiple inheritance?

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We do not need multiple inheritance. That said, read Inheritance - multiple and virtual inheritance

You have to use function pointers to call some function in exe from dll - you cannot link directly, because dll does not knows about your exe...

Look at any win32 API that uses CallBack functions.

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Originally Posted by vart

You have to use function pointers to call some function in exe from dll - you cannot link directly, because dll does not knows about your exe...

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You can link, I do it all the time. For plugin systems for example it could be useful. For code modularizing/reusing it isn't