removed some constants which weren't used anymore

updated documentation as mentioned in ticket #250


git-svn-id: svn://bind10.isc.org/svn/bind10/branches/trac172@2232 e5f2f494-b856-4b98-b285-d166d9295462

src/lib/cc/data.cc

@@ -30,25 +30,6 @@
 
 using namespace std;
 
-namespace {
-const unsigned char PROTOCOL_VERSION[4] = { 0x53, 0x6b, 0x61, 0x6e };
-
-const unsigned char ITEM_BLOB = 0x01;
-const unsigned char ITEM_HASH = 0x02;
-const unsigned char ITEM_LIST = 0x03;
-const unsigned char ITEM_NULL = 0x04;
-const unsigned char ITEM_BOOL = 0x05;
-const unsigned char ITEM_INT  = 0x06;
-const unsigned char ITEM_REAL = 0x07;
-const unsigned char ITEM_UTF8 = 0x08;
-const unsigned char ITEM_MASK = 0x0f;
-
-const unsigned char ITEM_LENGTH_32   = 0x00;
-const unsigned char ITEM_LENGTH_16   = 0x10;
-const unsigned char ITEM_LENGTH_8    = 0x20;
-const unsigned char ITEM_LENGTH_MASK = 0x30;
-}
-
 namespace isc {
 namespace data {
 

src/lib/cc/data.h

@@ -259,9 +259,9 @@ public:
     /// \brief These functions simply wrap the given data directly
     /// in an Element object, and return a reference to it, in the form
     /// of an \c ElementPtr.
-    /// If there is a memory allocation problem, these functions will
-    /// return a NULL ElementPtr, which can be checked with
-    /// Element::is_null(ElementPtr ep).
+    /// These factory functions are exception-free (unless there is
+    /// no memory available, in which case bad_alloc is raised by the
+    /// underlying system).
     /// (Note that that is different from an NullElement, which
     /// represents an empty value, and is created with Element::create())
     //@{