Thread: container

  1. #1
    Registered User
    Join Date
    Dec 2007


    I have been developing in c++ for about 6 months. So, by no means am I an expert. I have come across a problem where I need some sort of data structure to hold information in pairs - I think. I'm using Microsoft Visual C++. One of my problems is I have an object that is directly related to 1 other of the same object, but I would only like to show one object of the pair in a GUI. If that object is selected then somehow it triggers the object that is related to it and I remove both from my data strucuture.

    Lets say I have 10 distinct objects in my data structure.
    Then I would have 5 pairs or 5 objects that are related to another object in the data strucutre.
    They are related by date or price.

    Can anyone help me with a solution? I'm not sure if I'm making sense, lol.


  2. #2
    Kernel hacker
    Join Date
    Jul 2007
    Farncombe, Surrey, England
    STL has a "pair" that holds two items that belong together in some fashion.

    Not sure if that's much help or not.

    Compilers can produce warnings - make the compiler programmers happy: Use them!
    Please don't PM me for help - and no, I don't do help over instant messengers.

  3. #3
    and the hat of int overfl Salem's Avatar
    Join Date
    Aug 2001
    The edge of the known universe
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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  4. #4
    Registered User
    Join Date
    Dec 2007
    Yeah, I can see how that would work. Can I have a std::set<type pair> set1

  5. #5
    C++ Witch laserlight's Avatar
    Join Date
    Oct 2003
    If you are going to use a std::set<std::pair<T1, T2> >, a std::map<T1, T2> may be appropriate.
    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

  6. #6
    Registered User
    Join Date
    Jan 2005
    If you have a key-value situation, where one type is always the type you use to uniquely identify a pair, then use a map. If a pair is uniquely identified by both types, then you can use a set<pair<T1, T2>, comparator> where comparator is a custom function or object for comparing pair<T1, T2> objects.

    So which you choose depends on how you would uniquely identify an object in your container.

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