2011/8/18 planas <jsloz...@gmail.com>: > Johnny, > > On Thu, 2011-08-18 at 18:11 +0200, Johnny Rosenberg wrote: > >> I was, in a reply to another question, told that my questions were way >> too basic for the d...@api.openoffice.org list, so I'll give it a try >> here instead. >> >> I wrote some example code: >> >> REM ***** BASIC ***** >> >> Option Compatible >> Option Explicit >> >> Type MyType >> a As Integer >> b As Integer >> End Type >> Dim x(1) As MyType >> >> Sub Main >> Dim y As MyType >> Dim i As Integer >> For i=0 To 1 >> x(i).a=1+i*2 >> x(i).b=2+i*2 >> Next i >> y.a=5 >> y.b=6 >> >> MsgBox x(0).a & x(0).b & x(1).a & x(1).b & y.a & y.b ' Displays 123456 >> >> ReDim x(1) As MyType >> ReDim y As MyType >> MsgBox x(0).a & x(0).b & x(1).a & x(1).b & y.a & y.b ' Displays 123400 >> End Sub >> >> So if we have an array as MyType (or any other custom type, I >> suppose), ReDim will not reset it. >> Is this the expected behaviour or should I write a bug report? >> If it is expected, why? >> >> I guess it's unnecessary to mention that I am a complete beginner in >> everything that has anything to do with computers; we guitar players >> are quite stupid, you know. >> >> Oh, and in case it matters: >> LibreOffice 3.3.3, Ubuntu 10.10. >> LibreOffice installed with the debs at http://www.libreoffice.org/. >> >> Best regards >> >> Johnny ”The Moron” Rosenberg >> ジョニー・ローゼンバーグ >> > > I had to look up ReDim behavior myself, so do not to hard on yourself. > ReDim is used to re-dimension an array. It is particular useful when you > are likely to encounter an variable length array (different length each > time the code executes). Normally when the array is re-dimensioned the > previous values are destroyed because you normally want to enter new > values into the array. Some flavors of basic allow to use ReDim Preserve > to preserve the array's original value - you may want to try this to see > if works.
No, Preserve does the opposite, it preserves all the values. I want an EMPTY array without having to empty them with a time consuming For loop, so I though ReDim should do the job very quickly. It does in most cases, but as my example shows, not always… As you can see in my example, after ReDim y is reset to 0 (y.a=0, y.b=0) but x is not (x(0).a=1, for example). The difference between x and y is that x is an array and x is declared above the subroutine (this was a couple of days ago, so I don't remember if I tested absolutely everything, but as far as I remember, my conclusion was that an array of a custom type isn't reset to 0 after ReDim, I am not sure if there was a difference if it was defined in a subroutine or outside. So my question still is: Is this what I should expect or is it a bug? If it is a bug I will need to write a bug report, won't I? But I don't want to do that if this is the expected behaviour, because it only annoys people… Kind regards Johnny Rosenberg ジョニー・ローゼンバーグ > > A common use is > Dim MyArray() as type > > ReDim MyArry(1 to x), x will be supplied by the procedure. > > Often there are little subtleties that can drive you crazy when program, > the compiler/interpreter is very fussy that you follow all the grammar > and syntax rules for the langauge. > -- > Jay Lozier > jsloz...@gmail.com > > -- > For unsubscribe instructions e-mail to: users+h...@global.libreoffice.org > Problems? > http://www.libreoffice.org/get-help/mailing-lists/how-to-unsubscribe/ > Posting guidelines + more: http://wiki.documentfoundation.org/Netiquette > List archive: http://listarchives.libreoffice.org/global/users/ > All messages sent to this list will be publicly archived and cannot be deleted > -- For unsubscribe instructions e-mail to: users+h...@global.libreoffice.org Problems? http://www.libreoffice.org/get-help/mailing-lists/how-to-unsubscribe/ Posting guidelines + more: http://wiki.documentfoundation.org/Netiquette List archive: http://listarchives.libreoffice.org/global/users/ All messages sent to this list will be publicly archived and cannot be deleted
