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diff --git a/src/stlplus/persistence/persistent_inf.cpp b/src/stlplus/persistence/persistent_inf.cpp
deleted file mode 100644
index 29637c9..0000000
--- a/src/stlplus/persistence/persistent_inf.cpp
+++ /dev/null
@@ -1,66 +0,0 @@
-////////////////////////////////////////////////////////////////////////////////
-
-//   Author:    Andy Rushton
-//   Copyright: (c) Southampton University 1999-2004
-//              (c) Andy Rushton           2004-2009
-//   License:   BSD License, see ../docs/license.html
-
-////////////////////////////////////////////////////////////////////////////////
-
-// can be excluded to break the dependency on the portability library
-#ifndef NO_STLPLUS_INF
-
-#include "persistent_int.hpp"
-#include "persistent_string.hpp"
-#include "persistent_inf.hpp"
-
-////////////////////////////////////////////////////////////////////////////////
-
-void stlplus::dump_inf(stlplus::dump_context& context, const stlplus::inf& data)
-  throw(stlplus::persistent_dump_failed)
-{
-  // don't support dumping of old versions
-  if (context.version() < 2)
-    throw stlplus::persistent_dump_failed(std::string("stlplus::inf::dump: wrong version"));
-  // just dump the string
-  stlplus::dump_string(context,data.get_bytes());
-}
-
-////////////////////////////////////////////////////////////////////////////////
-
-void stlplus::restore_inf(stlplus::restore_context& context, stlplus::inf& data)
-  throw(stlplus::persistent_restore_failed)
-{
-  if (context.version() < 1)
-    throw stlplus::persistent_restore_failed(std::string("stlplus::inf::restore: wrong version"));
-  if (context.version() == 1)
-  {
-    // old-style restore relies on the word size being the same - 32-bits - on all platforms
-    // this can be restored on such machines but is not portable to 64-bit machines
-    std::string value;
-    unsigned bits = 0;
-    stlplus::restore_unsigned(context,bits);
-    unsigned words = (bits+7)/32;
-    // inf was dumped msB first
-    for (unsigned i = words; i--; )
-    {
-      // restore a word
-      unsigned word = 0;
-      stlplus::restore_unsigned(context,word);
-      // now extract the bytes
-      unsigned char* byte_ptr = (unsigned char*)(&word);
-      for (unsigned b = 4; b--; )
-        value.insert(value.begin(),byte_ptr[context.little_endian() ? b : 3 - b]);
-    }
-    data.set_bytes(value);
-  }
-  else
-  {
-    // new-style dump just uses the string persistence
-    std::string value;
-    stlplus::restore_string(context,value);
-    data.set_bytes(value);
-  }
-}
-////////////////////////////////////////////////////////////////////////////////
-#endif