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diff --git a/odb/cxx-lexer.hxx b/odb/cxx-lexer.hxx
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+// file      : odb/cxx-lexer.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2009-2010 Code Synthesis Tools CC
+// license   : GNU GPL v3; see accompanying LICENSE file
+
+#ifndef ODB_CXX_LEXER_HXX
+#define ODB_CXX_LEXER_HXX
+
+#include <odb/gcc.hxx>
+
+#include <string>
+
+// A C++ keyword. This is an extension to libcpp token types.
+//
+#define CPP_KEYWORD ((cpp_ttype) (N_TTYPES + 1))
+
+// A thin wrapper around cpp_reader for lexing C++ code fragments.
+//
+class cxx_lexer
+{
+public:
+  cxx_lexer ();
+  ~cxx_lexer ();
+
+public:
+  struct invalid_input {};
+
+  void
+  start (std::string const&);
+
+  cpp_ttype
+  next (std::string& token);
+
+public:
+  static char const* token_spelling[N_TTYPES + 1];
+
+private:
+  std::string data_;
+  std::string buf_;
+  line_maps line_map_;
+  cpp_reader* reader_;
+  cpp_callbacks* callbacks_;
+};
+
+#endif // ODB_CXX_LEXER_HXX