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diff --git a/src/stlplus/persistence/persistent_bitset.tpp b/src/stlplus/persistence/persistent_bitset.tpp
deleted file mode 100644
index e6b4d54..0000000
--- a/src/stlplus/persistence/persistent_bitset.tpp
+++ /dev/null
@@ -1,61 +0,0 @@
-////////////////////////////////////////////////////////////////////////////////
-
-//   Author:    Andy Rushton
-//   Copyright: (c) Southampton University 1999-2004
-//              (c) Andy Rushton           2004-2009
-//   License:   BSD License, see ../docs/license.html
-
-////////////////////////////////////////////////////////////////////////////////
-#include "persistent_int.hpp"
-
-namespace stlplus
-{
-
-  ////////////////////////////////////////////////////////////////////////////////
-  // format: data msB first, packed into bytes with lowest index at the byte's lsb
-
-  // Note: the interface does not provide access to the internal storage and yet
-  // to be efficient the std::bitset must be packed as bytes. Thus I have to do it the
-  // hard way.
-
-  template<size_t N>
-  void dump_bitset(dump_context& context, const std::bitset<N>& data)
-    throw(persistent_dump_failed)
-  {
-    size_t bits = data.size();
-    size_t bytes = (bits+7)/8;
-    for (size_t B = bytes; B--; )
-    {
-      unsigned char ch = 0;
-      for (size_t b = 0; b < 8; b++)
-      {
-        size_t bit = B*8+b;
-        if (bit < bits && data.test(bit))
-          ch |= (0x01 << b);
-      }
-      dump_unsigned_char(context,ch);
-    }
-  }
-
-  template<size_t N>
-  void restore_bitset(restore_context& context, std::bitset<N>& data)
-    throw(persistent_restore_failed)
-  {
-    size_t bits = data.size();
-    size_t bytes = (bits+7)/8;
-    for (size_t B = bytes; B--; )
-    {
-      unsigned char ch = 0;
-      restore_unsigned_char(context,ch);
-      for (size_t b = 0; b < 8; b++)
-      {
-        size_t bit = B*8+b;
-        if (bit >= bits) break;
-        data.set(bit, ch & (0x01 << b) ? true : false);
-      }
-    }
-  }
-
-  ////////////////////////////////////////////////////////////////////////////////
-
-} // end namespace stlplus