[lazarus] Patch win32: 'as' usage

Micha Nelissen M.Nelissen at student.tue.nl
Sun Aug 31 10:29:03 EDT 2003

Mattias Gaertner wrote:

> On Sun, 31 Aug 2003 15:47:42 +0200
> Micha Nelissen <M.Nelissen at student.tue.nl> wrote:
>>Attached patch greatly reduces the usage of the 'as' operator. Goal was 
>>to keep current functionality: only changes are made to those statements 
>>where the type was already verified before, either by 'is' or another
>>Question: what assumptions can we make about function entry? Then we can 
>>further reduce usage of as.
>>1) Can we assume Sender parameter is of type as FCompStyle indicates? 
>>Ie. csButton is a TButton?
> Yes.
>>2) Can we assume basic class like TWinControl? Some function seem to 
>>assume it by starting with an 'as' right at the beginning of the 
>>function. It may be an idea to change 'Sender: TObject' to 'Sender: 
>>TWinControl' if this is the case.
> Yes, for most functions. There are some exceptions: dialog's and menu's base
> class is only TComponent.
> Also consider that replacing an 'as' operator, that is not in a loop, will
> not get any measurable acceleration and you will loose an extra consistency
> check. 

OK, I have made a new patch using assumption #1. Please apply it. I 
haven't removed all 'as' usage: still half of them are there. It just 
seems very paranoid to use so much 'as'.



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