diff -r da93692e6537 -r 68ce4302fb0b demo/lp_maxflow_demo.cc
--- a/demo/lp_maxflow_demo.cc	Wed Jul 20 08:01:16 2005 +0000
+++ b/demo/lp_maxflow_demo.cc	Wed Jul 20 08:02:11 2005 +0000
@@ -82,12 +82,11 @@
   }
   
   //Objective function: the flow value entering 't'
-  {
-    LpDefault::Expr ex;
-    for(InEdgeIt  e(g,t);e!=INVALID;++e) ex+=x[e];
-    for(OutEdgeIt e(g,t);e!=INVALID;++e) ex-=x[e];
-    lp.setObj(ex);
-  }
+  LpDefault::Expr obj;
+  for(InEdgeIt  e(g,t);e!=INVALID;++e) obj+=x[e];
+  for(OutEdgeIt e(g,t);e!=INVALID;++e) obj-=x[e];
+  lp.setObj(obj);
+
 
   //Maximization
   lp.max();