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diff --git a/src/stlplus/strings/string_digraph.tpp b/src/stlplus/strings/string_digraph.tpp
new file mode 100644
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--- /dev/null
+++ b/src/stlplus/strings/string_digraph.tpp
@@ -0,0 +1,33 @@
+////////////////////////////////////////////////////////////////////////////////
+
+//   Author:    Andy Rushton
+//   Copyright: (c) Southampton University 1999-2004
+//              (c) Andy Rushton           2004-2009
+//   License:   BSD License, see ../docs/license.html
+
+////////////////////////////////////////////////////////////////////////////////
+#include "string_sequence.hpp"
+
+namespace stlplus
+{
+
+  ////////////////////////////////////////////////////////////////////////////////
+
+  template<typename NT, typename AT, typename NS, typename AS>
+  std::string digraph_to_string(const digraph<NT,AT>& values,
+                                NS node_to_string_fn,
+                                AS arc_to_string_fn,
+                                const std::string& separator)
+  {
+    std::string result;
+    result += "nodes:";
+    result += separator;
+    result += sequence_to_string(values.begin(), values.end(), node_to_string_fn, separator);
+    result += "arcs:";
+    result += separator;
+    result += sequence_to_string(values.arc_begin(), values.arc_end(), arc_to_string_fn, separator);
+    return result;
+  }
+
+} // end namespace stlplus
+