iif and type inference

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  • Maurizio Colucci
    #1

    iif and type inference

    Hello,

    Is there a way in VB.NET to do something like

    dim myInt = if foo() then bar(3) else 4

    and have the compiler infer that myInt is an Integer, since bar()
    returns an integer and 4 is an integer?

    Thanks a lot for any info.

    Maurizio
    Tags: None
    • Stanimir Stoyanov
      #2
      Re: iif and type inference

      No, there is not a short equivalent of if-else in VB.NET as there is in C#
      (condition ? true : false) but if you are sure that both statements return
      an object of the same type, you can cast the result of IIf: CInt(IIf(foo(),
      bar(3), 4)) in your case.

      Best Regards,
      Stanimir Stoyanov | www.stoyanoff.info

      "Maurizio Colucci" <maurizio.coluc ci@gmail.comwro te in message
      news:606ab28b-84cd-4263-b1f9-a3879a3f14da@27 g2000hsf.google groups.com...
      Hello,
      >
      Is there a way in VB.NET to do something like
      >
      dim myInt = if foo() then bar(3) else 4
      >
      and have the compiler infer that myInt is an Integer, since bar()
      returns an integer and 4 is an integer?
      >
      Thanks a lot for any info.
      >
      Maurizio

        Comment

        • Martin H.
          #3
          Re: iif and type inference

          Hello Maurizio,

          Since the code is not sooo difficult - why don't you just give it a try?

          Best regards,

          Martin

          On 17.07.2008 16:40, wrote Maurizio Colucci:
          Hello,
          >
          Is there a way in VB.NET to do something like
          >
          dim myInt = if foo() then bar(3) else 4
          >
          and have the compiler infer that myInt is an Integer, since bar()
          returns an integer and 4 is an integer?
          >
          Thanks a lot for any info.
          >
          Maurizio

            Comment

            • Maurizio Colucci
              #4
              Re: iif and type inference

              On Jul 17, 12:14 pm, "Martin H." <hk...@gmx.netw rote:
              Hello Maurizio,
              >
              Since the code is not sooo difficult - why don't you just give it a try?
              >
              I'm sorry, I don't think I understand that you mean.

              Maurizio

                Comment

                • Maurizio Colucci
                  #5
                  Re: iif and type inference

                  On Jul 17, 12:08 pm, "Stanimir Stoyanov" <stoya...@live. comwrote:
                  No, there is not a short equivalent of if-else in VB.NET as there is in C#
                  (condition ? true : false) but if you are sure that both statements return
                  an object of the same type, you can cast the result of IIf: CInt(IIf(foo(),
                  bar(3), 4)) in your case.
                  Thank you, I was afraid that was the only way. It also does not use
                  lazy evaluation.

                  Maurizio

                    Comment

                    • Patrice
                      #6
                      Re: iif and type inference

                      Which version ? If VB 2008, you could use the new If function :

                      Dim myInt = If(foo(), bar(3), 4)

                      --
                      Patrice

                      "Maurizio Colucci" <maurizio.coluc ci@gmail.coma écrit dans le message de
                      groupe de discussion :
                      606ab28b-84cd-4263-b1f9-a3879a3f14da...le groups.com...
                      Hello,
                      >
                      Is there a way in VB.NET to do something like
                      >
                      dim myInt = if foo() then bar(3) else 4
                      >
                      and have the compiler infer that myInt is an Integer, since bar()
                      returns an integer and 4 is an integer?
                      >
                      Thanks a lot for any info.
                      >
                      Maurizio

                        Comment

                        • Maurizio Colucci
                          #7
                          Re: iif and type inference

                          On Jul 17, 1:15 pm, "Patrice" <http://www.chez.com/scribe/wrote:
                          Which version ? If VB 2008, you could use the new If function :
                          >
                                  Dim myInt = If(foo(), bar(3), 4)
                          >
                          --
                          Patrice
                          That's great! Exactly what I was hoping for. Thanks a lot Patrice.

                          M

                            Comment

                            • Maurizio Colucci
                              #8
                              Re: iif and type inference


                              Thank you Nick. That's exactly what I was hoping for. :)

                              Maurizio

                                Comment

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