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diff --git a/src/stlplus/strings/print_digraph.hpp b/src/stlplus/strings/print_digraph.hpp
new file mode 100644
index 0000000..e5c2ff8
--- /dev/null
+++ b/src/stlplus/strings/print_digraph.hpp
@@ -0,0 +1,33 @@
+#ifndef STLPLUS_PRINT_DIGRAPH
+#define STLPLUS_PRINT_DIGRAPH
+////////////////////////////////////////////////////////////////////////////////
+
+//   Author:    Andy Rushton
+//   Copyright: (c) Southampton University 1999-2004
+//              (c) Andy Rushton           2004-2009
+//   License:   BSD License, see ../docs/license.html
+
+//   Generate a string representation of a digraph
+
+////////////////////////////////////////////////////////////////////////////////
+#include "strings_fixes.hpp"
+#include "digraph.hpp"
+#include <string>
+#include <iostream>
+
+////////////////////////////////////////////////////////////////////////////////
+
+namespace stlplus
+{
+
+  template<typename NT, typename AT, typename NS, typename AS>
+  void print_digraph(std::ostream& device,
+                     const digraph<NT,AT>& values,
+                     NS node_print_fn,
+                     AS arc_print_fn,
+                     const std::string& separator = ",");
+
+} // end namespace stlplus
+
+#include "print_digraph.tpp"
+#endif