X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~mdw/git/mLib/blobdiff_plain/dcda594451ecd4d8ba699da3e4cc3c723f31b538..78b1464e4a78dc364ecc8aebcfd5ec13b3f6bb07:/assoc.h

diff --git a/assoc.h b/assoc.h
index 6eea33a..68590a4 100644
--- a/assoc.h
+++ b/assoc.h
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: assoc.h,v 1.1 2001/01/20 11:50:58 mdw Exp $
+ * $Id: assoc.h,v 1.2 2001/01/25 21:12:22 mdw Exp $
  *
  * Assocation tables
  *
@@ -30,6 +30,9 @@
 /*----- Revision history --------------------------------------------------* 
  *
  * $Log: assoc.h,v $
+ * Revision 1.2  2001/01/25 21:12:22  mdw
+ * Add new macro to find an association's atom key.
+ *
  * Revision 1.1  2001/01/20 11:50:58  mdw
  * Hash tables indexed by atoms, to avoid expense of hashing keys on each
  * lookup, and to reduce storage used by key texts.
@@ -67,6 +70,8 @@ typedef struct assoc_base {
 
 typedef struct { hash_iter i; } assoc_iter;
 
+#define ASSOC_ATOM(p) (((assoc_base *)(p))->a + 0)
+
 /*----- Functions provided ------------------------------------------------*/
 
 /* --- @assoc_create@ --- *