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diff --git a/src/stlplus/strings/string_float.hpp b/src/stlplus/strings/string_float.hpp
new file mode 100644
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--- /dev/null
+++ b/src/stlplus/strings/string_float.hpp
@@ -0,0 +1,55 @@
+#ifndef STLPLUS_STRING_FLOAT
+#define STLPLUS_STRING_FLOAT
+////////////////////////////////////////////////////////////////////////////////
+
+//   Author:    Andy Rushton
+//   Copyright: (c) Southampton University 1999-2004
+//              (c) Andy Rushton           2004-2009
+//   License:   BSD License, see ../docs/license.html
+
+//   Convert a float/double to/from string
+
+////////////////////////////////////////////////////////////////////////////////
+#include "strings_fixes.hpp"
+#include "format_types.hpp"
+#include <string>
+#include <stdexcept>
+
+namespace stlplus
+{
+
+  ////////////////////////////////////////////////////////////////////////////////
+  // convert a real type to string
+  ////////////////////////////////////////////////////////////////////////////////
+
+  // Only decimal radix is supported
+
+  // The way in which the number is displayed is defined in radix_types.hpp
+  // Using any other value for the display type causes std::invalid_argument to be thrown
+
+  std::string float_to_string(float f,
+                              real_display_t display = display_mixed,
+                              unsigned width = 0,
+                              unsigned precision = 6)
+    throw(std::invalid_argument);
+
+  std::string double_to_string(double f,
+                               real_display_t display = display_mixed,
+                               unsigned width = 0,
+                               unsigned precision = 6)
+    throw(std::invalid_argument);
+
+  ////////////////////////////////////////////////////////////////////////////////
+  // Convert a string to a floating-point type
+
+  float string_to_float(const std::string& value)
+    throw(std::invalid_argument);
+
+  double string_to_double(const std::string& value)
+    throw(std::invalid_argument);
+
+  ////////////////////////////////////////////////////////////////////////////////
+
+} // end namespace stlplus
+
+#endif