doc/structures.tex, lib/sod-structs.3: Justify union $C$__ichainu_$h$.

[sod] / doc / structures.tex

diff --git a/doc/structures.tex b/doc/structures.tex
index 1c9646f..7cc825a 100644 (file)
--- a/doc/structures.tex
+++ b/doc/structures.tex
@@ -409,7 +409,8 @@ and this is followed by corresponding members
   struct $A$__ichain_$h$ $a$;
 \end{prog}
 for each of $C$'s superclasses $A$ in the same chain in some (unimportant)
-order.
+order.  The (somewhat obtuse) purpose of this union is to engage the `common
+initial sequence' rule of \cite[6.5.2.3]{FIXME:C99}.
 
 \subsubsection{The ichain structure}
 The @|ichain| structure contains (in order), a pointer