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Compiler Error CS0715

'static class' : static classes cannot contain user defined operators

User defined operators operate on instances of classes. Static classes cannot be instantiated, so it is not possible to create instances for operators to act upon. Hence, user defined operators are not allowed for static classes.

The following sample generates CS0715:

// CS0715.cs
public static class C
   public static C operator+(C c)  // CS0715

   public static void Main()

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