Macro: SB-EXT:DEFINE-CAS-EXPANDER

Analogous to DEFINE-SETF-EXPANDER. Defines a CAS-expansion for ACCESSOR. BODY must return six values as specified in GET-CAS-EXPANSION.

Note that the system provides no automatic atomicity for CAS expansion, nor can it verify that they are atomic: it is up to the implementor of a CAS expansion to ensure its atomicity.

EXPERIMENTAL: Interface subject to change.

Lambda list

(sb-impl::accessor sb-impl::lambda-list &body sb-impl::body)