diff -r 93fcadf94ab0 -r 8d49961ec50f lemon/lp_base.h
--- a/lemon/lp_base.h	Fri Mar 31 11:10:44 2006 +0000
+++ b/lemon/lp_base.h	Fri Mar 31 12:04:48 2006 +0000
@@ -159,6 +159,8 @@
     static const Value INF;
     ///The not a number constant
     static const Value NaN;
+
+    static inline bool isNaN(const Value& v) { return v!=v; }
     
     ///Refer to a column of the LP.
 
@@ -1105,7 +1107,9 @@
 
     ///\e Solve the LP problem at hand
     ///
-    ///\return The result of the optimization procedure. Possible values and their meanings can be found in the documentation of \ref SolveExitStatus.
+    ///\return The result of the optimization procedure. Possible 
+    ///values and their meanings can be found in the documentation of 
+    ///\ref SolveExitStatus.
     ///
     ///\todo Which method is used to solve the problem
     SolveExitStatus solve() { return _solve(); }
@@ -1290,7 +1294,7 @@
   {
     LpSolverBase::Constr tmp(c);
     ///\todo Create an own exception type.
-    if(!isnan(tmp.lowerBound())) throw LogicError();
+    if(!LpSolverBase::isNaN(tmp.lowerBound())) throw LogicError();
     else tmp.lowerBound()=n;
     return tmp;
   }
@@ -1303,7 +1307,7 @@
   {
     LpSolverBase::Constr tmp(c);
     ///\todo Create an own exception type.
-    if(!isnan(tmp.upperBound())) throw LogicError();
+    if(!LpSolverBase::isNaN(tmp.upperBound())) throw LogicError();
     else tmp.upperBound()=n;
     return tmp;
   }
@@ -1317,7 +1321,7 @@
   {
     LpSolverBase::Constr tmp(c);
     ///\todo Create an own exception type.
-    if(!isnan(tmp.upperBound())) throw LogicError();
+    if(!LpSolverBase::isNaN(tmp.upperBound())) throw LogicError();
     else tmp.upperBound()=n;
     return tmp;
   }
@@ -1330,7 +1334,7 @@
   {
     LpSolverBase::Constr tmp(c);
     ///\todo Create an own exception type.
-    if(!isnan(tmp.lowerBound())) throw LogicError();
+    if(!LpSolverBase::isNaN(tmp.lowerBound())) throw LogicError();
     else tmp.lowerBound()=n;
     return tmp;
   }