Changeset 493:81627fa1b007 in lemon for lemon/math.h

Timestamp:

01/14/09 16:55:29 (15 years ago)

Author:

Alpar Juttner <alpar@…>

Branch:

default

Phase:

public

Message:

Own support for isnan()

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;
+    }
 
   /// @}