diff -r caf16813b1e8 -r 1782aa72495a lemon/cplex.h
--- a/lemon/cplex.h	Sat Jul 21 10:18:57 2012 +0200
+++ b/lemon/cplex.h	Fri Jul 20 17:09:01 2012 +0200
@@ -150,6 +150,8 @@
 
     bool _message_enabled;
 
+    void _write(std::string file, std::string format) const;
+
   public:
 
     /// Returns the used \c CplexEnv instance
@@ -170,6 +172,19 @@
     /// Returns the cplex problem object
     const cpxlp* cplexLp() const { return _prob; }
 
+#ifdef DOXYGEN
+    /// Write the problem or the solution to a file in the given format
+
+    /// This function writes the problem or the solution
+    /// to a file in the given format.
+    /// Trying to write in an unsupported format will trigger
+    /// \ref UnsupportedFormatError.
+    /// \param file The file path
+    /// \param format The output file format.
+    /// Supportted formats are "MPS", "LP" and "SOL".
+    void write(std::string file, std::string format = "MPS") const {}
+#endif
+
   };
 
   /// \brief Interface for the CPLEX LP solver