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diff --git a/src/stlplus/strings/string_vector.cpp b/src/stlplus/strings/string_vector.cpp
new file mode 100644
index 0000000..bee9b88
--- /dev/null
+++ b/src/stlplus/strings/string_vector.cpp
@@ -0,0 +1,27 @@
+////////////////////////////////////////////////////////////////////////////////
+
+//   Author:    Andy Rushton
+//   Copyright: (c) Southampton University 1999-2004
+//              (c) Andy Rushton           2004-2009
+//   License:   BSD License, see ../docs/license.html
+
+////////////////////////////////////////////////////////////////////////////////
+#include "string_vector.hpp"
+
+namespace stlplus
+{
+
+  ////////////////////////////////////////////////////////////////////////////////
+  // special case of vector<bool>
+
+  std::string bool_vector_to_string(const std::vector<bool>& values)
+  {
+    std::string result;
+    for (size_t i = 0; i < values.size(); i++)
+      result.append(1, values[i] ? '1' : '0');
+    return result;
+  }
+
+  ////////////////////////////////////////////////////////////////////////////////
+
+} // end namespace stlplus