How can I declare a pointer based on a generic type?

I have a class like this:

type A = class
    procedure<T> DoStuff(tPtr: ^T);
end;

But when I try to compile, Delphi gives me this error:

[DCC Error] RPML.pas(57): E2029 Identifier expected but '^' found

How can I use a pointer to a parameterized type in a Delphi procedure? I don't want to make the whole class a template class.