%eclent; ]> Declarations are used to give the compiler optimizing information about foreign types. Currently, only &CMUCL; supports declarations. On &ACL; and &LW;, these expressions declare the type generically as &t; def-type Defines a Common Lisp type. Macro def-type name type name A symbol naming the type type A form that specifies the &UFFI; type. It is not evaluated. Defines a Common Lisp type based on a &UFFI; type. (def-type char-ptr '(* :char)) ... (defun foo (ptr) (declare (type char-ptr ptr)) ... Defines a new &CommonLisp; type. None. None.