Changes in lemon/math.h [440:88ed40ad0d4f:511:06787db0ef5f] in lemon-1.2

File:

• lemon/math.h (modified) (1 diff)

lemon/math.h

@@ -56 +56 @@
   const long double SQRT1_2 = 0.7071067811865475244008443621048490L;
 
+  ///Check whether the parameter is NaN or not
+  
+  ///This function checks whether the parameter is NaN or not.
+  ///Is should be equivalent with std::isnan(), but it is not
+  ///provided by all compilers.
+  inline bool isNaN(double v)
+    {
+      return v!=v;
+    }
 
   /// @}