function pointer inner member function of class C++

This is a discussion on function pointer inner member function of class C++ within the C++ Programming forums, part of the General Programming Boards category; Hi, i've got problem with function pointer, the program crash when i try to run, compiler is OK (gcc version ...

  1. #1
    Registered User PuKa's Avatar
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    function pointer inner member function of class C++

    Hi, i've got problem with function pointer, the program crash when i try to run, compiler is OK (gcc version 4.3.2). thanks a lot for any helping.

    Code:
    #include <iostream>
    class one {
    public:
        int min(int a, int b) {
            if (a < b) return a;
            else return b;
        }
        int guru() {
            int (one::*func)(int, int) = NULL;
            return (*this.*func)(2,3);
         }
    };
    int main() {
        one o;
        o.guru(); // crash
        return 0;
    }

  2. #2
    C++ Witch laserlight's Avatar
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    Perhaps you meant to write:
    Code:
    int (one::*func)(int, int) = &one::min;
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

  3. #3
    and the hat of int overfl Salem's Avatar
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    You seem to be pointing at NULL, not min.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.

  4. #4
    Registered User PuKa's Avatar
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    It's work, thanks very much.

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