akr	2007-08-30 10:54:51 +0900 (Thu, 30 Aug 2007)

  New Revision: 13314

  Modified files:
    trunk/include/ruby/ruby.h

  Log:
    add comment.


  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi/trunk/include/ruby/ruby.h?r1=13314&r2=13313

Index: include/ruby/ruby.h
===================================================================
--- include/ruby/ruby.h	(revision 13313)
+++ include/ruby/ruby.h	(revision 13314)
@@ -478,10 +478,11 @@
 
 struct RHash {
     struct RBasic basic;
-    struct st_table *ntbl;      /* maybe 0 */
+    struct st_table *ntbl;      /* possibly 0 */
     int iter_lev;
     VALUE ifnone;
 };
+/* RHASH_TBL allocates st_table if not available. */
 #define RHASH_TBL(h) rb_hash_tbl(h)
 #define RHASH_ITER_LEV(h) (RHASH(h)->iter_lev)
 #define RHASH_IFNONE(h) (RHASH(h)->ifnone)
@@ -548,7 +549,7 @@
 
 struct RBignum {
     struct RBasic basic;
-    char sign;
+    char sign; /* positive:0, negative:1 */
     long len;
     void *digits;
 };

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