How do you detect the type of an object ?

General
1

I have an array of variants. Inside that array I have instances of different classes, and I need to analyse each one of them.
How can I get the type of an element, and if it contains an instance of a particular class ?

For example, let’s assume that we have three classes named Tom, Dick and Harry. I could initialize an array of variants this way:

    Dim listOfObjects() As Variant

    listOfObjects.Append(New Tom())
    listOfObjects.Append(New Dick())
    listOfObjects.Append(New Harry())

In this case, how can I detect if listOfObject(2) contains an instance of Tom, Dick or Harry ?

In VB.NET I could write something like this:

    If listOfObjects(2).getType() Is GetType(Tom) Then
        ...
    Else If listOfObject(2).getType() Is GetType(Dick) Then
       ...
    End If

But I don’t know how to write a similar piece of code in Xojo.

Thank you

2

if listOfObjects(2) IsA Tom then ... ElseIf listOfObjects(2) IsA Dick then ,,, End If

3

[quote=18441:@Tim Hare]if listOfObjects(2) IsA Tom then ... ElseIf listOfObjects(2) IsA Dick then ,,, End If [/quote]

Thank you very much, this is exactly what I was looking for

4

I like Select cases also for this, seems like a nice clean syntax:

Select Case listOfObjects(2) Case IsA Tom ... Case IsA Dick ... Case IsA Harry ... Case Else ... End Select

5

variants kind of force you to write type unsafe code AND also force you to write piles of “isA …” kinds of code

if each member of that array implemented a common interface then the array could be typed as that interface and each member could still be a different base class type AND the interface type

you get type safety & reasonably generic code at the same shot