diff -r 000000000000 -r 6474c204b198 xpcom/string/public/nsTDependentString.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xpcom/string/public/nsTDependentString.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,98 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+
+  /**
+   * nsTDependentString_CharT
+   *
+   * Stores a null-terminated, immutable sequence of characters.
+   *
+   * Subclass of nsTString that restricts string value to an immutable
+   * character sequence.  This class does not own its data, so the creator
+   * of objects of this type must take care to ensure that a
+   * nsTDependentString continues to reference valid memory for the
+   * duration of its use.
+   */
+class nsTDependentString_CharT : public nsTString_CharT
+  {
+    public:
+
+      typedef nsTDependentString_CharT    self_type;
+
+    public:
+
+        /**
+         * constructors
+         */
+
+      nsTDependentString_CharT( const char_type* start, const char_type* end )
+        : string_type(const_cast<char_type*>(start), uint32_t(end - start), F_TERMINATED)
+        {
+          AssertValidDepedentString();
+        }
+
+      nsTDependentString_CharT( const char_type* data, uint32_t length )
+        : string_type(const_cast<char_type*>(data), length, F_TERMINATED)
+        {
+          AssertValidDepedentString();
+        }
+
+#if defined(CharT_is_PRUnichar) && defined(MOZ_USE_CHAR16_WRAPPER)
+      nsTDependentString_CharT( char16ptr_t data, uint32_t length )
+        : nsTDependentString_CharT(static_cast<const char16_t*>(data), length) {}
+#endif
+
+      explicit
+      nsTDependentString_CharT( const char_type* data )
+        : string_type(const_cast<char_type*>(data), uint32_t(char_traits::length(data)), F_TERMINATED)
+        {
+          AssertValidDepedentString();
+        }
+
+#if defined(CharT_is_PRUnichar) && defined(MOZ_USE_CHAR16_WRAPPER)
+      explicit
+      nsTDependentString_CharT( char16ptr_t data )
+        : nsTDependentString_CharT( static_cast<const char16_t*>(data)) {}
+#endif
+
+      nsTDependentString_CharT( const string_type& str, uint32_t startPos )
+        : string_type()
+        {
+          Rebind(str, startPos);
+        }
+
+      // Create a nsTDependentSubstring to be bound later
+      nsTDependentString_CharT()
+        : string_type() {}
+
+      // XXX are you sure??
+      // auto-generated copy-constructor OK
+      // auto-generated copy-assignment operator OK
+      // auto-generated destructor OK
+
+
+        /**
+         * allow this class to be bound to a different string...
+         */
+
+      using nsTString_CharT::Rebind;
+      void Rebind( const char_type* data )
+        {
+          Rebind(data, uint32_t(char_traits::length(data)));
+        }
+
+      void Rebind( const char_type* start, const char_type* end )
+        {
+          Rebind(start, uint32_t(end - start));
+        }
+
+      void Rebind( const string_type&, uint32_t startPos );
+
+    private:
+      
+      // NOT USED
+      nsTDependentString_CharT( const substring_tuple_type& );
+  };