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Callback Functions currently not supported

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    Callback Functions currently not supported

    Hi,

    Finally I found the official statement that callback functions are currently not supported by Xbasic. Tests already demonstrate that, an immediate Crash and Burn of A5.

    Does this mean that callback functions will be supported in the near future? Hmmmm, this would be nice. A problem might be that the amount of users who would use this kind of function is very small. Nevertheless I look foreward to it.

    Marcel
    Marcel

    I hear and I forget. I see and I remember. I do and I understand.
    ---- Confusius ----

    #2
    RE: Callback Functions currently not supported

    Marcel,

    While we don't have specific support for callback functions, we do have the concept of function pointers....


    foo(bar)
    foo(blah)


    FUNCTION foo AS V (fn AS F)
    fn()
    END FUNCTION

    FUNCTION bar AS V()
    ui_msg_box("In Bar", "In bar")
    END FUNCTION

    FUNCTION blah AS V ()
    ui_msg_box("In blah", "In Blah")
    END FUNCTION
    Aaron Brown
    Alpha Software Development Team

    Comment


      #3
      RE: Callback Functions currently not supported

      Hi Aaron,

      Thanks. I tested this piece of code prompt. I saw these V-type now and then. It is a VOID type, isn't it?

      The passing of the function name is the passing of a pointer of that function to the function?

      Ehh, I hope this is correct English.. and I'm asking myself if I understand what �'ve written...., I understand the principle. Ok, I'll start a Crash and Burn lesson with A5.

      Marcel
      Marcel

      I hear and I forget. I see and I remember. I do and I understand.
      ---- Confusius ----

      Comment


        #4
        RE: Callback Functions currently not supported

        AS V is void type, so the function doesn't return a value.

        AS F is a function pointer, so I can also do this:

        DIM foo AS F

        foo = bar
        foo()

        FUNCTION bar AS V ()
        ui_msg_box("Bar", "In bar...would you like a drink?")
        END FUNCTION
        Aaron Brown
        Alpha Software Development Team

        Comment


          #5
          RE: Callback Functions currently not supported

          Make mine a double please so I can crash and burn with Marcel :)
          Cheryl
          #1 Designs By Pagecrazy
          http://pagecrazy.com/

          Comment


            #6
            RE: Callback Functions currently not supported

            Hi Aaron,

            I think you have to pass these examples to Edward Larrabee. I can't find them in the helpfile, at least not at the place I would expect it, the DIM subject.

            Aaron thank you very much for these examples, next time I'll buy you a drink in the foobar ;-)

            Marcel
            Marcel

            I hear and I forget. I see and I remember. I do and I understand.
            ---- Confusius ----

            Comment


              #7
              RE: Callback Functions currently not supported

              I did found a reference to the F type in "Variable Data Types and Scope" and a link to FUNCTIONS, but then the trail is lost.
              Marcel

              I hear and I forget. I see and I remember. I do and I understand.
              ---- Confusius ----

              Comment


                #8
                RE: Callback Functions currently not supported

                I'll let him know.

                If you find bugs, let me know, as it has not been tested too much.
                Aaron Brown
                Alpha Software Development Team

                Comment


                  #9
                  RE: Callback Functions currently not supported

                  Obviously.
                  Marcel

                  I hear and I forget. I see and I remember. I do and I understand.
                  ---- Confusius ----

                  Comment


                    #10
                    RE: Callback Functions currently not supported

                    What additional information do you need?

                    Comment


                      #11
                      RE: Callback Functions currently not supported

                      Hi Edward,

                      At least the information and examples Aaron supplied and I would expect it that the F type would be listed by the DIM command. Than you have a complete listing of var types.

                      Marcel
                      Marcel

                      I hear and I forget. I see and I remember. I do and I understand.
                      ---- Confusius ----

                      Comment


                        #12
                        RE: Callback Functions currently not supported

                        Hi Edward,

                        Thank you very much for adding the F (function) type and the FOO examples in the DIM subject in the help file.

                        Regards,

                        Marcel Kollenaar
                        Marcel

                        I hear and I forget. I see and I remember. I do and I understand.
                        ---- Confusius ----

                        Comment

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