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  1. February 8th, 2005, 04:11 AM #1
    bashish
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    Exclamation Which is better option

    I have two classes PersonalDetails and ProfessionalDetails. Now I have to derive classes for permanent / Temp / consultant employee from PersonalDetails. The derived class should also contain information of ProfessionalDetails.

    So I have some options

    1. Derive the classes taking both as base
    2. Derive the classes from PersonalDetails and add object of ProfessionalDetails.

    I would like to know which is better in terms of coding, memory usage etc.


    Thanks
    bashish
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  2. February 8th, 2005, 04:37 AM #2
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    Graham
    Graham is offline Elite Member Power Poster
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    Re: Which is better option

    3. Have both as member objects.

    The relationship between an "employee" and these details is HAS-A in both cases, not IS-A
    Correct is better than fast. Simple is better than complex. Clear is better than cute. Safe is better than insecure.
    --     Sutter and Alexandrescu, C++ Coding Standards

    Programs must be written for people to read, and only incidentally for machines to execute.
    --     Harold Abelson and Gerald Jay Sussman

    The cheapest, fastest and most reliable components of a computer system are those that aren't there.
     -- Gordon Bell
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  3. February 8th, 2005, 06:14 AM #3
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    cilu
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    Re: Which is better option

    3. Have both as member objects.
    What about a Decorator? I think it's appropriate because only some people need Professional Details. And if later he finds out that some people need some ExtraDetails, then the changes needed are minimal.
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  4. February 8th, 2005, 07:43 AM #4
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    Graham
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    Re: Which is better option

    A good point, it's just that I read the question as implying that all the employees would have both types of details, so that level of flexibility might be classed as over-design in this case. Decorator is certainly worth considering if there was a possibility that professional details might not be applicable, though.
    Correct is better than fast. Simple is better than complex. Clear is better than cute. Safe is better than insecure.
    --     Sutter and Alexandrescu, C++ Coding Standards

    Programs must be written for people to read, and only incidentally for machines to execute.
    --     Harold Abelson and Gerald Jay Sussman

    The cheapest, fastest and most reliable components of a computer system are those that aren't there.
     -- Gordon Bell
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  6. February 8th, 2005, 08:17 AM #5
    bashish
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    Re: Which is better option

    Can you give me details of Decorator

    bashish
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  7. February 8th, 2005, 08:37 AM #6
    Andreas Masur
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    Re: Which is better option

    Decorator...
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  8. February 8th, 2005, 10:54 AM #7
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    cilu
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    Re: Which is better option

    Not to mention "Design Patterns" by Gamma & Co (Gang of Four) and "Thinking in Patters" in Java or C++ by Bruce Eckel.
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  9. February 9th, 2005, 01:09 AM #8
    bashish
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    Re: Which is better option

    Thanks every one.


    bashish
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