diff -r 4b3191b4970b -r cd8897f67c26 lemon/lp_base.h
--- a/lemon/lp_base.h	Mon Jul 17 07:30:56 2006 +0000
+++ b/lemon/lp_base.h	Mon Jul 17 09:00:21 2006 +0000
@@ -175,6 +175,7 @@
     protected:
       int id;
       friend class LpSolverBase;
+      friend class MipSolverBase;
     public:
       typedef Value ExprValue;
       typedef True LpSolverCol;
@@ -1156,7 +1157,33 @@
     
   };  
 
-  ///\e
+
+  ///Common base class for ILP solvers
+  ///\todo Much more docs
+  ///\ingroup gen_opt_group
+  class MipSolverBase : virtual public LpSolverBase{
+  public:
+
+    ///Set the type of the given Col to integer or remove that property.
+    ///
+    ///Set the type of the given Col to integer or remove that property.
+    void integer(Col c, bool enable) {
+      _integer(cols.floatingId(c.id),enable);
+    }
+
+    ///Gives back the type of the column.
+    ///
+    ///Gives back the type of the column.
+    ///\return true if the column has integer type and false if not.
+    bool integer(Col c){
+      return _integer(cols.floatingId(c.id));
+    }
+
+  protected:
+
+    virtual bool _integer(int col) = 0;
+    virtual void _integer(int col, bool enable) = 0;
+  };
   
   ///\relates LpSolverBase::Expr
   ///