diff -r e4ec01f1a4cd -r 852361980706 lemon/lp_glpk.h
--- a/lemon/lp_glpk.h	Tue Apr 08 15:16:16 2008 +0000
+++ b/lemon/lp_glpk.h	Tue Apr 08 16:01:28 2008 +0000
@@ -49,8 +49,8 @@
     ~LpGlpk();
     
   protected:
-    virtual LpSolverBase &_newLp();
-    virtual LpSolverBase &_copyLp();
+    virtual LpSolverBase* _newLp();
+    virtual LpSolverBase* _copyLp();
 
     virtual int _addCol();
     virtual int _addRow();
@@ -120,6 +120,12 @@
 
     ///Pointer to the underlying GLPK data structure.
     LPX *lpx() {return lp;}
+
+    ///Returns the constraint identifier understood by GLPK.
+    int lpxRow(Row r) { return _lpId(r); }
+
+    ///Returns the variable identifier understood by GLPK.
+    int lpxCol(Col c) { return _lpId(c); }
   };
 } //END OF NAMESPACE LEMON