bitset: Include limits.h.

	* bitset: Include limits.h.
	* bitset (class bitset): Declare reference as our friend.

From-SVN: r30430

libstdc++/stl/ChangeLog

+1999-11-06  Martin v. Lwis  <loewis@informatik.hu-berlin.de>
+
+	* bitset (class bitset): Declare reference as our friend.
+	* bitset: Include limits.h.
+
 1999-08-08  Alexandre Oliva  <oliva@dcc.unicamp.br>
 
 	* pthread_alloc: Solaris' ctype.h defines _U to 01; use _Up as

libstdc++/stl/bitset

@@ -36,6 +36,7 @@
 
 
 #include <stddef.h>     // for size_t
+#include <limits.h>     // for CHAR_BIT
 #include <string>
 #include <stdexcept>    // for invalid_argument, out_of_range, overflow_error
 #include <iostream.h>   // for istream, ostream
@@ -568,6 +569,8 @@ private:
 public:
 
   // bit reference:
+  class reference;
+  friend class reference;
   class reference {
     friend class bitset;