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{ Variation without virtual classes : no VMT }
{ here sizeof directly returns a constant value }
type
pbaseclass = ^tbaseclass;
pderivedclass = ^tderivedclass;
tbaseclass = object
x : byte;
function getsize : longint; static;
procedure check_size;
end;
tderivedclass = object(tbaseclass)
y : byte;
end;
const
expected_size_for_tbaseclass = sizeof(byte);
expected_size_for_tderivedclass = 2*sizeof(byte);
var
basesize : longint;
derivedsize : longint;
function tbaseclass.getsize : longint;
begin
{ self = pointer to VMT }
getsize:=sizeof(self);
end;
procedure tbaseclass.check_size;
begin
if getsize<>sizeof(pointer) then
begin
Writeln('Compiler creates garbage ',sizeof(self),'<>',sizeof(pointer));
halt(1);
end;
end;
var
cb : tbaseclass;
cd : tderivedclass;
c1 : pbaseclass;
begin
new(c1);
basesize:=sizeof(cb);
Writeln('Sizeof(cb)=',basesize);
if basesize<>expected_size_for_tbaseclass then
begin
Writeln('not the expected size : ',expected_size_for_tbaseclass);
halt(1);
end;
derivedsize:=sizeof(cd);
Writeln('Sizeof(ct)=',derivedsize);
if derivedsize<>expected_size_for_tderivedclass then
begin
Writeln('not the expected size : ',expected_size_for_tderivedclass);
halt(1);
end;
cb.check_size;
end.
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