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diff --git a/src/stlplus/persistence/persistent_exceptions.cpp b/src/stlplus/persistence/persistent_exceptions.cpp
new file mode 100644
index 0000000..d233826
--- /dev/null
+++ b/src/stlplus/persistence/persistent_exceptions.cpp
@@ -0,0 +1,64 @@
+////////////////////////////////////////////////////////////////////////////////
+
+//   Author:    Andy Rushton
+//   Copyright: (c) Southampton University 1999-2004
+//              (c) Andy Rushton           2004-2009
+//   License:   BSD License, see ../docs/license.html
+
+////////////////////////////////////////////////////////////////////////////////
+
+#include "persistent_exceptions.hpp"
+#include <stdio.h>
+
+////////////////////////////////////////////////////////////////////////////////
+
+static std::string to_string(int number)
+{
+  // use sprintf in a very controlled way that cannot overrun
+  char* buffer = new char[50];
+  sprintf(buffer, "%i", number);
+  std::string result = buffer;
+  delete buffer;
+  return result;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// exceptions
+
+stlplus::persistent_illegal_type::persistent_illegal_type(const std::string& type) throw() : 
+  std::logic_error(std::string("illegal type: ") + type)
+{
+}
+
+stlplus::persistent_illegal_type::persistent_illegal_type(unsigned key) throw() : 
+  std::logic_error(std::string("illegal key: ") + to_string((int)key))
+{
+}
+
+stlplus::persistent_illegal_type::~persistent_illegal_type(void) throw()
+{
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+stlplus::persistent_dump_failed::persistent_dump_failed(const std::string& message) throw() :
+  std::runtime_error(std::string("dump failed: ") + message)
+{
+}
+
+stlplus::persistent_dump_failed::~persistent_dump_failed(void) throw()
+{
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+stlplus::persistent_restore_failed::persistent_restore_failed(const std::string& message) throw() :
+  std::runtime_error(std::string("restore failed: ") + message)
+{
+}
+
+stlplus::persistent_restore_failed::~persistent_restore_failed(void) throw()
+{
+}
+
+////////////////////////////////////////////////////////////////////////////////