Searching a vector of objects for pairs
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  1. #1
    Join Date
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    Searching a vector of objects for pairs

    Hello all,

    Say I have a vector of objects and I want to return an object based on a pair of strings. The strings can be in either order Ie; A B==B A.

    In general, what do you think is the best way to do this?

    Thanks,
    T.

  2. #2
    Join Date
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    Re: Searching a vector of objects for pairs

    Quote Originally Posted by azeotrope View Post
    In general, what do you think is the best way to do this?
    There can be varying opinion on what is the "best way".

    http://www.cplusplus.com/reference/algorithm/find_if/

    Regards,

    Paul McKenzie

  3. #3
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    Re: Searching a vector of objects for pairs

    I think you have to provide more details to get a serious answer.

    Edit: Sorry Paul, was typing a response but changed my mind before posting so your response was not accounted for.
    Last edited by S_M_A; May 16th, 2013 at 02:46 PM.
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  4. #4
    GCDEF is offline Elite Member Power Poster
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    Re: Searching a vector of objects for pairs

    Quote Originally Posted by S_M_A View Post
    I think you have to provide more details to get a serious answer.
    I agree, the question doesn't make much sense. Sounds to me like you may want a map.

  5. #5
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    Re: Searching a vector of objects for pairs

    You may want to consider a sorted vector or a map as stated above.

  6. #6
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    Re: Searching a vector of objects for pairs

    Quote Originally Posted by azeotrope View Post
    Say I have a vector of objects and I want to return an object based on a pair of strings. The strings can be in either order Ie; A B==B A.
    Well, if you search the vector from begin to end you'll have O(N) complexity.

    But if you introduce an extra unordered_map you can get O(1) accesses into the vector.

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