Thread: Function question..

  1. #1
    Registered User snapshooter's Avatar
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    Sep 2004

    Function question..

    Hi.. i want to make a function in order to store variable's values.
    e.g if i have a value_1=0 and value_1+=1, in the function, i want the second time the function run, the value=1 is the init value...

  2. #2
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    Dec 2004
    As far as I know a functor is just any normal class that declares operator().

    though for your needs a function with static local variables might be enough (unless the god of good OOP frown on them of course).

  3. #3
    Cat without Hat CornedBee's Avatar
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    Apr 2003
    Static variables are indeed what you probably need here; the question, though, is why? If the function is really standing alone, statics might be acceptable, but that depends heavily on the case. For example, statics are never thread safe. Also, if the variable in question has any relation to an object, it might be a better idea to make it a member of said object. Perhaps a static member.
    All the buzzt!

    "There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code."
    - Flon's Law

  4. #4
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    Dec 2004
    Why did I read function as functor?

    Anyway if the function is not part of any object a functor might be a more robust solution than static variables.

  5. #5
    Banned master5001's Avatar
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    Aug 2001
    Visalia, CA, USA
    directed at sigfriedmcwild:

    Static variables aren't frowned upon, but they are in a sense like gobal variables, you must first ask yourself: "Do I really have no other way of doing this?" Then you must ask yourself: "should I just make this variable a global?" And finally: "If I have multiple threads that may be using this function, will it cause a race conditon or any sort of undireable results?"

    Keeping those questions in mind may keep you from making sloppy code that could have been done another way.

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