diff -r 7a28e215f715 -r 99a31b399b59 lemon/lp_base.h
--- a/lemon/lp_base.h	Tue Apr 14 10:54:42 2009 +0200
+++ b/lemon/lp_base.h	Tue Apr 14 10:40:33 2009 +0100
@@ -69,6 +69,21 @@
       MAX
     };
 
+    ///Enum for \c messageLevel() parameter
+    enum MessageLevel {
+      /// no output (default value)
+      MESSAGE_NOTHING,
+      /// error messages only
+      MESSAGE_ERROR,
+      /// warnings
+      MESSAGE_WARNING,
+      /// normal output
+      MESSAGE_NORMAL,
+      /// verbose output
+      MESSAGE_VERBOSE
+    };
+    
+
     ///The floating point type used by the solver
     typedef double Value;
     ///The infinity constant
@@ -973,6 +988,8 @@
 
     virtual const char* _solverName() const = 0;
 
+    virtual void _messageLevel(MessageLevel level) = 0;
+
     //Own protected stuff
 
     //Constant component of the objective function
@@ -1527,6 +1544,9 @@
     ///Clears the problem
     void clear() { _clear(); }
 
+    /// Sets the message level of the solver
+    void messageLevel(MessageLevel level) { _messageLevel(level); }
+
     ///@}
 
   };