type casting object to int?

This is a discussion on type casting object to int? within the C++ Programming forums, part of the General Programming Boards category; hi Guys, well i have a small issue (i think). i have a class that only contains one variable and ...

  1. #1
    Registered User
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    Jan 2009
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    type casting object to int?

    hi Guys,

    well i have a small issue (i think). i have a class that only contains one variable and i was wondering if i could assign an object of this class, to a variable of the same type as it's only data member by type casting this class. (among other things) i have tried the following but i get compile errors:

    Code:
    class A
    {
    private:
      int a;  
    };
    
    int main(int argc, char* argv[])
    {
      A objA;
    
      int b;
      b = (int)objA;
    
      return 0;
    }
    with reinterpret_cast also doesn't work:
    Code:
    b = reinterpret_cast<int>(objA);
    can it be done?
    Last edited by symbiote; 03-14-2009 at 06:30 PM.

  2. #2
    C++ Witch laserlight's Avatar
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    If you want to allow conversion to int, provide a conversion function, i.e., operator int(). If implicit conversion is undesirable (and it often is undesirable), then provide a named function that returns an int instead of a conversion function.
    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
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    interesting.
    thanks again laserlight (problem solved)

    Greetings
    Last edited by symbiote; 03-14-2009 at 10:48 PM.

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