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diff --git a/src/stlplus/strings/format_types.hpp b/src/stlplus/strings/format_types.hpp
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+#ifndef STLPLUS_FORMAT_TYPES
+#define STLPLUS_FORMAT_TYPES
+////////////////////////////////////////////////////////////////////////////////
+
+//   Author:    Andy Rushton
+//   Copyright: (c) Southampton University 1999-2004
+//              (c) Andy Rushton           2004-2009
+//   License:   BSD License, see ../docs/license.html
+
+//   A Set of enumerations controlling the string formatting of numbers.
+
+////////////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////////////
+// Integer radix display representations:
+//   There are three ways in which the radix is represented:
+//     - none - the number is just printed as a number (e.g. 12345). Can be confusing for non-decimal radix
+//     - C style - for binary, octal and hex, the C-style prefices 0b, 0 and 0x are used
+//       note that this is an unsigned representation
+//     - Hash style - in the form radix#value - the value may be signed, e.g. 10#-9
+
+enum radix_display_t 
+{
+  radix_none,               // just print the number with no radix indicated
+  radix_hash_style,         // none for decimal, hash style for all others
+  radix_hash_style_all,     // hash style for all radices including decimal
+  radix_c_style,            // C style for hex and octal, none for others
+  radix_c_style_or_hash     // C style for hex and octal, none for decimal, hash style for others
+};
+
+////////////////////////////////////////////////////////////////////////////////
+// Floating-point display representations:
+// There are three formats for the printout:
+//   - fixed - formatted as a fixed-point number, so no mantissa is printed (equivalent to %f in printf)
+//   - floating - formatted as a normalised floating-point number (equivalent to %e in printf)
+//   - mixed - formatted as fixed-point if appropriate, otherwise the floating format (equivalent to %g in printf)
+
+enum real_display_t
+{
+  display_fixed,    // %f
+  display_floating, // %e
+  display_mixed     // %g
+};
+
+////////////////////////////////////////////////////////////////////////////////
+// Alignment:
+//   There are three field alignments:
+//     - left aligned - the value is to the left of the field which is padded to the right with spaces
+//     - right aligned - the value is to the right of the field which is padded to the left with spaces
+//     - centred - the value is in the centre of the field and spaces added to both left and right
+
+enum alignment_t
+{
+  align_left,
+  align_right,
+  align_centre
+};
+
+////////////////////////////////////////////////////////////////////////////////
+#endif