Do pointers exist in basic4ppc?

taximania said:

B4X:

when I go back to check my stored data in b(), it will have changed.[/QUOTE]That is correct, try it. :)
[code]
Sub Globals
   'Declare the global variables here.
   Dim A(1)
   Dim B(0)
   Dim C(0)
End Sub

Sub App_Start
   B() = A()
   C() = A()
   A(0) = "fred"
   Msgbox(B(0) & " " & C(0))
End Sub

It's not really dangerous as long as you know what is happening. This is the way .NET reference types work, and just about everything apart from numbers are reference types in .NET. In Basic4ppc you would use ArrayCopy if you wanted to make sure the original array was unchanged.

Click to expand...

taximania said:

B4X:

This sounds totally dangerous :sign0137:[/QUOTE]
References are not dangerous, but it's dangerous not to know if you work with a reference or not. :)

If you need a real copy of an array you have to use [B]ArrayCopy[/B].

[CODE]Sub Globals
   'Declare the global variables here.
    Dim A(10)
    Dim B(0)
   Dim C(0)

   Dim AA(10)
    Dim BB(10)
   Dim CC(10)
End Sub

Sub App_Start
   Form1.Show
   
   A(0) = "taxi"
   B() = A()
   C() = A()
   A(0) = "fred"
   Msgbox(B(0) & " " & C(0)) ' shows "fred fred" 

   AA(0) = "taxi"   
   ArrayCopy(AA(), 0, ArrayLen (AA()), BB(), 0)
   ArrayCopy(AA(), 0, ArrayLen (AA()), CC(), 0)
   AA(0) = "fred"
   Msgbox(BB(0) & " " & CC(0)) ' shows "taxi taxi" 

End Sub

specci48


Edit: sorry agraham, 4 minutes late....

Click to expand...