diff -r e427615afb48 -r a3484f00a5f0 lemon/lp_base.h
--- a/lemon/lp_base.h	Tue Jun 14 10:26:37 2005 +0000
+++ b/lemon/lp_base.h	Tue Jun 14 13:55:28 2005 +0000
@@ -47,12 +47,12 @@
 
     ///\param n is a floating id
     ///\return the corresponding fix id
-    int fixId(int n) {return cross[n];}
+    int fixId(int n) const {return cross[n];}
     ///Convert a fix id to a floating one
 
     ///\param n is a fix id
     ///\return the corresponding floating id
-    int floatingId(int n) { return index[n];}
+    int floatingId(int n) const { return index[n];}
     ///Add a new floating id.
 
     ///\param n is a floating id