Function pointers

This is a discussion on Function pointers within the C++ Programming forums, part of the General Programming Boards category; I have a C++ class -- CUtility. I made an instance of the class, Utility. All the tutorials on function ...

  1. #1
    Banned frenchfry164's Avatar
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    Function pointers

    I have a C++ class -- CUtility. I made an instance of the class, Utility. All the tutorials on function pointer I've read require you use static functions, but I need to use a non-static function from the instance of my CUtility class. How can I do this?

  2. #2
    Registered User Casey's Avatar
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    The only difference between a static and nonstatic function is that a static function only has file scope. A nonstatic (external) function can be seen by other files. There's absolutely nothing wrong with using an external function as the address for a function pointer.

  3. #3
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    Code:
    
    class CUtility
    {
    public:
      void setNum(int i) { num = i; } 
    private:
      int num;
    };
    
    typedef void (CUtility::*pointerToMember)(int);
    
    int main()
    {
      pointerToMember func = &CUtility::setNum;
      CUtility utility;
    
      (utility.*func)(10);
    
      return 0;
    }

  4. #4
    Banned frenchfry164's Avatar
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    I did that and got this (MSVC++ 6)

    Code:
    H:\JOSH'S MY DOCUMENTS\Simple 3D Engine\engine.cpp(59) : fatal error C1001: INTERNAL COMPILER ERROR
            (compiler file 'msc1.cpp', line 1786) 
             Please choose the Technical Support command on the Visual C++ 
             Help menu, or open the Technical Support help file for more information

  5. #5
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    Hrm, I just compiled this on both gcc 3.2 and MSVC6. You may need to upgrade to SP5.

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