delphi의 Supports 함수 설명

{ Interface support routines }

function Supports(const Instance: IInterface; const IID: TGUID; out Intf): Boolean; overload;
function Supports(const Instance: TObject; const IID: TGUID; out Intf): Boolean; overload;
function Supports(const Instance: IInterface; const IID: TGUID): Boolean; overload;
function Supports(const Instance: TObject; const IID: TGUID): Boolean; overload;
function Supports(const AClass: TClass; const IID: TGUID): Boolean; overload;

{ Interface support routines }

function Supports(const Instance: IInterface; const IID: TGUID; out Intf): Boolean;
begin
  Result := (Instance <> nil) and (Instance.QueryInterface(IID, Intf) = 0);
end;

function Supports(const Instance: TObject; const IID: TGUID; out Intf): Boolean;
var
  LUnknown: IUnknown;
begin
  Result := (Instance <> nil) and
            ((Instance.GetInterface(IUnknown, LUnknown) and Supports(LUnknown, IID, Intf)) or
             Instance.GetInterface(IID, Intf));
end;

function Supports(const Instance: IInterface; const IID: TGUID): Boolean;
var
  Temp: IInterface;
begin
  Result := Supports(Instance, IID, Temp);
end;

function Supports(const Instance: TObject; const IID: TGUID): Boolean;
var
  Temp: IInterface;
begin
  Result := Supports(Instance, IID, Temp);
end;

function Supports(const AClass: TClass; const IID: TGUID): Boolean;
begin
  Result := AClass.GetInterfaceEntry(IID) <> nil;
end;

    Result := AClass.GetInterfaceEntry(IID) <> nil;