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diff --git a/src/stlplus/strings/string_bool.cpp b/src/stlplus/strings/string_bool.cpp
new file mode 100644
index 0000000..ee25231
--- /dev/null
+++ b/src/stlplus/strings/string_bool.cpp
@@ -0,0 +1,35 @@
+////////////////////////////////////////////////////////////////////////////////
+
+//   Author:    Andy Rushton
+//   Copyright: (c) Southampton University 1999-2004
+//              (c) Andy Rushton           2004-2009
+//   License:   BSD License, see ../docs/license.html
+
+//   use the unsigned short representation for bool
+
+////////////////////////////////////////////////////////////////////////////////
+#include "string_bool.hpp"
+#include "string_int.hpp"
+
+namespace stlplus
+{
+
+  ////////////////////////////////////////////////////////////////////////////////
+
+  std::string bool_to_string(bool i, unsigned radix, radix_display_t display, unsigned width)
+    throw(std::invalid_argument)
+  {
+    return unsigned_short_to_string((unsigned short)i, radix, display, width);
+  }
+
+  ////////////////////////////////////////////////////////////////////////////////
+
+  bool string_to_bool(const std::string& str, unsigned radix)
+    throw(std::invalid_argument)
+  {
+    return string_to_unsigned_short(str, radix) != 0;
+  }
+
+  ////////////////////////////////////////////////////////////////////////////////
+
+} // end namespace stlplus