return a function

This is a discussion on return a function within the C++ Programming forums, part of the General Programming Boards category; Hi there! Could anyone tell me how to return a function back to main()?? Cheers ps i have looked on ...

  1. #1
    Registered User
    Join Date
    Oct 2002
    Posts
    59

    return a function

    Hi there!

    Could anyone tell me how to return a function back to main()??



    Cheers



    ps i have looked on the boards......

  2. #2
    Code Goddess Prelude's Avatar
    Join Date
    Sep 2001
    Posts
    9,796
    Use a function pointer:
    Code:
    #include <iostream>
    
    typedef void (*pf)();
    
    void print()
    {
      std::cout<<"Now we're havin fun!\n";
    }
    
    pf func()
    {
      return &print;
    }
    
    int main()
    {
      func()(); // How's this for wacky syntax? :p
      return 0;
    }
    -Prelude
    My best code is written with the delete key.

  3. #3
    S Sang-drax's Avatar
    Join Date
    May 2002
    Location
    Göteborg, Sweden
    Posts
    2,072
    Then, how's this?
    Code:
     
    void  (*func())()
    {
      return &print;
    }
    Last edited by Sang-drax : Tomorrow at 02:21 AM. Reason: Time travelling

  4. #4
    Blank
    Join Date
    Aug 2001
    Posts
    1,034
    You can't return functions in c. You can in scheme and some other languages but not in c++.

    There's stuft you can do such as returning function pointers
    or function objects which are classes like

    Code:
    class C
    {
    public:
           int operator()(int n) const { printf("n = %d\n"); }
    };

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