src/compiler/deftype.lisp

   1 ;;;; This software is part of the SBCL system. See the README file for
   2 ;;;; more information.
   3 ;;;;
   4 ;;;; This software is derived from the CMU CL system, which was
   5 ;;;; written at Carnegie Mellon University and released into the
   6 ;;;; public domain. The software is in the public domain and is
   7 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
   8 ;;;; files for more information.
   9
  10 (in-package "SB!IMPL")
  11
  12 (def!macro sb!xc:deftype (name arglist &body body)
  13   #!+sb-doc
  14   "Define a new type, with syntax like DEFMACRO."
  15   (unless (symbolp name)
  16     (error "type name not a symbol: ~S" name))
  17   (with-unique-names (whole)
  18     (multiple-value-bind (body local-decs doc)
  19         (parse-defmacro arglist whole body name 'deftype :default-default ''*)
  20       `(eval-when (:compile-toplevel :load-toplevel :execute)
  21          (%compiler-deftype ',name
  22                             (lambda (,whole)
  23                               ,@local-decs
  24                               ,body)
  25                             ,@(when doc `(,doc)))))))