diff -r a3402913cffe -r f63e87b9748e lemon/lp_base.h
--- a/lemon/lp_base.h	Sat Apr 18 21:54:30 2009 +0200
+++ b/lemon/lp_base.h	Tue Apr 21 10:34:49 2009 +0100
@@ -52,12 +52,12 @@
 
     ///Possible outcomes of an LP solving procedure
     enum SolveExitStatus {
-      ///This means that the problem has been successfully solved: either
+      /// = 0. It means that the problem has been successfully solved: either
       ///an optimal solution has been found or infeasibility/unboundedness
       ///has been proved.
       SOLVED = 0,
-      ///Any other case (including the case when some user specified
-      ///limit has been exceeded)
+      /// = 1. Any other case (including the case when some user specified
+      ///limit has been exceeded).
       UNSOLVED = 1
     };
 
@@ -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
@@ -988,7 +1005,7 @@
     ///Gives back the name of the solver.
     const char* solverName() const {return _solverName();}
 
-    ///\name Build up and modify the LP
+    ///\name Build Up and Modify the LP
 
     ///@{
 
@@ -1527,6 +1544,9 @@
     ///Clears the problem
     void clear() { _clear(); }
 
+    /// Sets the message level of the solver
+    void messageLevel(MessageLevel level) { _messageLevel(level); }
+
     ///@}
 
   };
@@ -1768,15 +1788,15 @@
 
     /// The problem types for primal and dual problems
     enum ProblemType {
-      ///Feasible solution hasn't been found (but may exist).
+      /// = 0. Feasible solution hasn't been found (but may exist).
       UNDEFINED = 0,
-      ///The problem has no feasible solution
+      /// = 1. The problem has no feasible solution.
       INFEASIBLE = 1,
-      ///Feasible solution found
+      /// = 2. Feasible solution found.
       FEASIBLE = 2,
-      ///Optimal solution exists and found
+      /// = 3. Optimal solution exists and found.
       OPTIMAL = 3,
-      ///The cost function is unbounded
+      /// = 4. The cost function is unbounded.
       UNBOUNDED = 4
     };
 
@@ -1832,7 +1852,7 @@
 
     ///@}
 
-    ///\name Obtain the solution
+    ///\name Obtain the Solution
 
     ///@{
 
@@ -1954,17 +1974,16 @@
 
     /// The problem types for MIP problems
     enum ProblemType {
-      ///Feasible solution hasn't been found (but may exist).
+      /// = 0. Feasible solution hasn't been found (but may exist).
       UNDEFINED = 0,
-      ///The problem has no feasible solution
+      /// = 1. The problem has no feasible solution.
       INFEASIBLE = 1,
-      ///Feasible solution found
+      /// = 2. Feasible solution found.
       FEASIBLE = 2,
-      ///Optimal solution exists and found
+      /// = 3. Optimal solution exists and found.
       OPTIMAL = 3,
-      ///The cost function is unbounded
-      ///
-      ///The Mip or at least the relaxed problem is unbounded
+      /// = 4. The cost function is unbounded.
+      ///The Mip or at least the relaxed problem is unbounded.
       UNBOUNDED = 4
     };
 
@@ -1986,14 +2005,14 @@
 
     ///@}
 
-    ///\name Setting column type
+    ///\name Set Column Type
     ///@{
 
     ///Possible variable (column) types (e.g. real, integer, binary etc.)
     enum ColTypes {
-      ///Continuous variable (default)
+      /// = 0. Continuous variable (default).
       REAL = 0,
-      ///Integer variable
+      /// = 1. Integer variable.
       INTEGER = 1
     };
 
@@ -2014,7 +2033,7 @@
     }
     ///@}
 
-    ///\name Obtain the solution
+    ///\name Obtain the Solution
 
     ///@{