searching a map
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Thread: searching a map

  1. #1
    Join Date
    Mar 2010
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    Question searching a map

    Cna someone please help...I am trying to search a map by a give string "userName" but the map has an int key value

    Status::Code ChatRoomManager::NewChatRoom(ChatRoomInfo* chatRoom_info)
    map<int, ClientInfo*> clients;

  2. #2
    Join Date
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    Re: searching a map

    What is the connection between the map and username ?

  3. #3
    Join Date
    Mar 2010
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    6

    Re: searching a map

    Sorry username is a bit misguiding. I am trying to search for the chatrooms contained in the map by their name " chat_name"

  4. #4
    Join Date
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    Re: searching a map

    You have no choice but to just iterate thru the map and check
    the chat_name.

    Why do you have an int as the key, if you want to search using
    chatname ?

  5. #5
    Join Date
    Mar 2010
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    6

    Re: searching a map

    I have to write 2 separate functions, one to search by room ID and one to search by name. What would be the effect of using 2 maps one with string key and the other with an int key?

  6. #6
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    Re: searching a map

    Quote Originally Posted by jc35
    I have to write 2 separate functions, one to search by room ID and one to search by name. What would be the effect of using 2 maps one with string key and the other with an int key?
    That can work, but you have to be careful to keep them in sync. Alternatively, you may be able to use Boost.Bimap.
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  7. #7
    Lindley is offline Elite Member Power Poster
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    Re: searching a map

    Another option would be to define a map<string,int> which maps from the name to the integer you need to look up into the other map. The downside is two lookups are required when starting from a name, but in some cases it might be easier to keep things managable than throwing a pointer into two different maps.

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