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QString in switch statement

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  • ankit thakarA Offline
    ankit thakarA Offline
    ankit thakar
    wrote on last edited by
    #1

    Can't we use QString for comparision in switch statement like below,

    QString str = "TEMP";

    switch (str)
    {
    

    I tried to use like this but it didnot work.

    kshegunovK beeckscheB 2 Replies Last reply
    0
    • ankit thakarA ankit thakar

      Can't we use QString for comparision in switch statement like below,

      QString str = "TEMP";

      switch (str)
      {
      

      I tried to use like this but it didnot work.

      kshegunovK Offline
      kshegunovK Offline
      kshegunov
      Moderators
      wrote on last edited by
      #2

      @ankit-thakar
      No, C++ doesn't allow for non-integral types in switch statements.

      Kind regards.

      Read and abide by the Qt Code of Conduct

      1 Reply Last reply
      4
      • ankit thakarA ankit thakar

        Can't we use QString for comparision in switch statement like below,

        QString str = "TEMP";

        switch (str)
        {
        

        I tried to use like this but it didnot work.

        beeckscheB Offline
        beeckscheB Offline
        beecksche
        wrote on last edited by beecksche
        #3

        @ankit-thakar

        When you want to use a String in a switch statement, you obviosily know which String can be entered. In this case you can use enums.

        enum Strings { String1, String2, etc. }
        

        With this enums you're allowed to use the switch statement. Like

        Strings myString;
        
        switch (myString)
        {
         case Strings::String1:
          break;
         case Strings::String2:
          break;
         ...
         default:
          break;
        }
        

        So you can use the switch and it is readable in your code.

        kshegunovK 1 Reply Last reply
        -1
        • beeckscheB beecksche

          @ankit-thakar

          When you want to use a String in a switch statement, you obviosily know which String can be entered. In this case you can use enums.

          enum Strings { String1, String2, etc. }
          

          With this enums you're allowed to use the switch statement. Like

          Strings myString;
          
          switch (myString)
          {
           case Strings::String1:
            break;
           case Strings::String2:
            break;
           ...
           default:
            break;
          }
          

          So you can use the switch and it is readable in your code.

          kshegunovK Offline
          kshegunovK Offline
          kshegunov
          Moderators
          wrote on last edited by kshegunov
          #4

          @beecksche
          The inefficient part would be converting the string you have to a corresponding enum, and this pretty much defeats the whole purpose of having a duplicating enum and a switch construct.

          Read and abide by the Qt Code of Conduct

          1 Reply Last reply
          0
          • V Offline
            V Offline
            Violet Giraffe
            wrote on last edited by
            #5

            Just use

            if (str == "...")
            {
               // ...
            }
            else if (str == "...")
            {
               // ...
            }
            //...
            else 
            {
                // ...
            }
            
            1 Reply Last reply
            0

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