why this limitation ? SWAP function

[DirectuX]

Hi,

I come across this issue:

'---Script created on 12-20-2018 16:59:40 by

' help page : https://www.thinbasic.com/public/products/thinBasic/help/html/index.html?swap.htm


uses "console"

  Type POINTAPI
      x As Long
      y As Long
End Type

  type desk
      dstart as POINTAPI
      dstop as POINTAPI
end type

  dim lab(10) as desk
  dim uu as Long Value = 555
  dim vv as Long Value = 111

  lab(1).dstart.x=555
  lab(2).dstart.x=111

'Simple swap of two variables, ok
  printl "swap simple variables using swap"
  printl uu,vv
  printl "swapping"

  swap uu,vv

  PrintL uu,vv
  printl "Press a key to next"
  printl ""
  WaitKey

'This was not working back in 2013 according to https://www.thinbasic.com/community/project.php?issueid=420#note2514
'But now it is ok
  printl "swap UDT array element using swap"
  printl lab(1).dstart.x , lab(2).dstart.X
  printl "swapping"

  swap lab(1),lab(2)

  printl lab(1).dstart.x , lab(2).dstart.X
  printl "Press a key to next"
  printl ""
  WaitKey

'This works thanks https://www.thinbasic.com/community/project.php?issueid=420#note2514
  printl "swap udt variables using Memory_Swap"
  printl lab(1).dstart.x , lab(2).dstart.X
  printl "swapping"

  Memory_Swap(VarPtr(lab(1).dstart.x), VarPtr(lab(2).dstart.x), SizeOf(Long))

  printl lab(1).dstart.x , lab(2).dstart.X
  printl "Press a key to next"
  printl ""
  WaitKey

'So why not this ? swap lab(1).dstart.x , lab(2).dstart.X
  printl "swap udt variables using swap"
  printl lab(1).dstart.x , lab(2).dstart.X
  printl "swapping : here raise an error: Expected comma ',' but found something else."
  printl "Press a key to error"
  waitkey
  
  swap(lab(1).dstart.x, lab(2).dstart.x)

  printl lab(1).dstart.x , lab(2).dstart.X
  printl "Press a key to next"

  WaitKey

so, as seen, it is possible with memory_swap, then why swap comes with this limitation ?




https://www.thinbasic.com/community/...ll=1#post89255 this simple (1st post) order / rorder is a pleasant idea.