1.0.45.32: export SB-PCL:+SLOT-UNBOUND+

[sbcl.git] / doc / manual / beyond-ansi.texinfo

diff --git a/doc/manual/beyond-ansi.texinfo b/doc/manual/beyond-ansi.texinfo
index 83197f6..224a1f7 100644 (file)
--- a/doc/manual/beyond-ansi.texinfo
+++ b/doc/manual/beyond-ansi.texinfo
@@ -69,6 +69,8 @@ Extensions}.
 @comment  node-name,  next,  previous,  up
 @section Metaobject Protocol
 
+@subsection AMOP Compatibility of Metaobject Protocol
+
 SBCL supports a metaobject protocol which is intended to be compatible
 with AMOP; present exceptions to this (as distinct from current bugs)
 are:
@@ -217,6 +219,8 @@ states that any class found by @code{find-class}, no matter what its
 
 @end itemize
 
+@subsection Metaobject Protocol Extensions
+
 In addition, SBCL supports extensions to the Metaobject protocol from
 AMOP; at present, they are:
 
@@ -256,6 +260,15 @@ specializer.  The system-provided methods on those methods convert
 between classes and proper names and between lists of the form
 @code{(eql @var{x})} and interned eql specializer objects.
 
+@item
+@vindex @sbpcl{+slot-unbound+}
+@findex @sbmop{standard-instance-access}
+@findex @sbmop{funcallable-standard-instance-access}
+distinguising unbound instance allocated slots from bound ones when
+using @code{standard-instance-access} and
+@code{funcallable-standard-instance-access} is possible by comparison
+to the constant @code{+slot-unbound+}.
+
 @end itemize
 
 @node  Support For Unix