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program E01;
{$IFDEF FPC}
{$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}
type
TA = class
constructor Create(A: Integer = 0); overload; virtual;
end;
TB = class(TA)
constructor Create(A: Integer); overload; override;
end;
TClassB = class of TB;
var
tacalled,
tbcalled: boolean;
constructor TA.Create(A: Integer = 0);
begin
WriteLn('TA.Create');
tacalled:=true;
end;
constructor TB.Create(A: Integer);
begin
WriteLn('TB.Create');
tbcalled:=true;
end;
var
B: TB;
ClassB: TClassB;
begin
B := TB.Create; // TA.Create (VMT is not used
// compiler can determine) -- in Delphi;
// In FPC, because TB.Create is used, we
// call TB.Create
if tacalled then
halt(1);
if not tbcalled then
halt(2);
tbcalled:=false;
B.Create; // call TB.Create because of VMT rules
B.Free;
if tacalled then
halt(3);
if not tbcalled then
halt(4);
tbcalled:=false;
ClassB := TB;
B := ClassB.Create; // call TB.Create because of VMT rules
B.Free;
if tacalled then
halt(5);
if not tbcalled then
halt(6);
end.
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