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program DestBug;
{$APPTYPE CONSOLE}
{$MODE Delphi}
uses
Variants, SysUtils;
type
TSampleVariant = class(TCustomVariantType)
protected
procedure Clear(var V: TVarData); override;
procedure Copy(var Dest: TVarData; const Source: TVarData; const Indirect: Boolean ); override;
procedure DispInvoke(Dest: PVarData; const Source: TVarData; CallDesc: PCallDesc; Params: Pointer); override;
end;
procedure TSampleVariant.Clear(var V: TVarData);
begin
V.VType:=varEmpty;
end;
procedure TSampleVariant.Copy(var Dest: TVarData; const Source: TVarData; const Indirect: Boolean);
begin
if Indirect and VarDataIsByRef(Source) then
VarDataCopyNoInd(Dest, Source)
else with Dest do
VType:=Source.VType;
end;
var
p : pointer;
procedure TSampleVariant.DispInvoke(Dest: PVarData; const Source: TVarData; CallDesc: PCallDesc; Params: Pointer);
begin
Writeln('Dest is 0x', IntToStr(Cardinal(Dest)));
p:=Dest;
end;
var
SampleVariant: TSampleVariant;
v, v1: Variant;
begin
SampleVariant:=TSampleVariant.Create;
TVarData(v).VType:=SampleVariant.VarType;
v.SomeProc;
if assigned(p) then
halt(1);
v1:=v.SomeFunc;
if not(assigned(p)) then
halt(1);
writeln('ok');
end.
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