On Thu, 8 Dec 2005, Felipe Monteiro de Carvalho wrote:
> Michael Van Canneyt wrote:
> > No.
> >
> > Adding 'Const' does NOT automatically imply passing it by reference.
> >
> > This used to be so in the initial versions of the compiler,
> > but has been changed quite a while ago.
>
> But TRect is a structure. Everything I read from Delphi documentation states
> that calling conventions always pass the variable by reference if it is a
> structure. How can a TRect not be passed by reference? Would the compiler try
> to PUSH 4 integer-size variables to the stack? I think this is almost
> impossible to happen.
>
> Also the Delphi (5) declaration of the functions has const keyword.
Maybe, but nowhere in the Delphi 7 documentation it is stated that const
implies passing by reference. It MAY happen, but it's not guaranteed.
>From the Delpi 7 docs:
'Constant parameters are similar to value parameters'
'Using Const allows the compiler to optimize code for structured- and
string-type'
a value parameter is not passed by reference.
Anyway, I'm not a compiler guy, Peter or Florian or Jonas should be answering
this.
Michael.
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