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{$ifdef fpc}{$mode objfpc}{$else}{$J+}{$endif}
type
tbaseclass = class
x : byte;
class procedure virtual_class_method; virtual;
class procedure call_virtual_class_method;
class function getsize : longint;
procedure check_size;
end;
tderivedclass = class(tbaseclass)
y : byte;
class procedure virtual_class_method; override;
end;
const
tbasecalled : boolean = false;
tderivedcalled : boolean = false;
has_error : boolean = false;
expected_size_for_tbaseclass = sizeof(pointer) + sizeof(byte);
expected_size_for_tderivedclass = sizeof(pointer) + 2*sizeof(byte);
var
basesize : longint;
derivedsize : longint;
class procedure tbaseclass.virtual_class_method;
begin
Writeln('Calling tbase class class method');
tbasecalled:=true;
if sizeof(self)<>basesize then
begin
has_error:=true;
Writeln('Error with sizeof');
end;
end;
class function tbaseclass.getsize : longint;
begin
getsize:=sizeof(self);
end;
procedure tbaseclass.check_size;
begin
if sizeof(self)<>getsize then
begin
Writeln('Compiler creates garbage');
has_error:=true;
end;
end;
class procedure tbaseclass.call_virtual_class_method;
begin
virtual_class_method;
if getsize<>sizeof(self) then
begin
Writeln('Compiler creates garbage');
has_error:=true;
end;
end;
class procedure tderivedclass.virtual_class_method;
begin
Writeln('Calling tderived class class method');
tderivedcalled:=true;
if sizeof(self)<>derivedsize then
begin
has_error:=true;
Writeln('Error with sizeof');
end;
end;
procedure reset_booleans;
begin
tbasecalled:=false;
tderivedcalled:=false;
end;
type
tcl = class of tbaseclass;
var
c1,cb : tbaseclass;
cd : tderivedclass;
cc : tcl;
begin
cb:=tbaseclass.create;
cd:=tderivedclass.create;
c1:=tbaseclass.create;
basesize:=sizeof(cb);
Writeln('Sizeof(cb)=',basesize);
if basesize<>sizeof(pointer) then
Writeln('not the expected size : ',sizeof(pointer));
Writeln('cb.InstanceSize=',Cb.InstanceSize);
if cb.InstanceSize<>expected_size_for_tbaseclass then
Writeln('not the expected size : ',expected_size_for_tbaseclass);
Writeln('Tbaseclass.InstanceSize=',Tbaseclass.InstanceSize);
if TBaseClass.InstanceSize<>expected_size_for_tbaseclass then
Writeln('not the expected size : ',expected_size_for_tbaseclass);
derivedsize:=sizeof(cd);
Writeln('Sizeof(ct)=',derivedsize);
if derivedsize<>sizeof(pointer) then
Writeln('not the expected size : ',sizeof(pointer));
cb.check_size;
cd.check_size;
tbaseclass.virtual_class_method;
if not tbasecalled then
has_error:=true;
reset_booleans;
tbaseclass.call_virtual_class_method;
if not tbasecalled then
has_error:=true;
reset_booleans;
tderivedclass.virtual_class_method;
if not tderivedcalled then
has_error:=true;
reset_booleans;
tderivedclass.call_virtual_class_method;
if not tderivedcalled then
has_error:=true;
reset_booleans;
c1.virtual_class_method;
if not tbasecalled then
has_error:=true;
reset_booleans;
c1.call_virtual_class_method;
if not tbasecalled then
has_error:=true;
reset_booleans;
c1.destroy;
c1:=tderivedclass.create;
c1.virtual_class_method;
if not tderivedcalled then
has_error:=true;
reset_booleans;
c1.call_virtual_class_method;
if not tderivedcalled then
has_error:=true;
reset_booleans;
c1.destroy;
cc:=tbaseclass;
cc.virtual_class_method;
if not tbasecalled then
has_error:=true;
reset_booleans;
cc.call_virtual_class_method;
if not tbasecalled then
has_error:=true;
reset_booleans;
cc:=tderivedclass;
cc.virtual_class_method;
if not tderivedcalled then
has_error:=true;
reset_booleans;
cc.call_virtual_class_method;
if not tderivedcalled then
has_error:=true;
reset_booleans;
Writeln('Sizeof(cc)=',sizeof(cc));
if has_error then
begin
Writeln('Error with class methods');
halt(1);
end;
end.
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