Why don't static member variables play well with the ternary operator?

This is according to the C++ Standard. The ternary operator does constitute a single lvalue that will refer to either GOOD or BAD at runtime. The lvalue to rvalue conversion is not applied immediately to either the lvalue GOOD or BAD and therefor you require a definition of GOOD and BAD .

These are only declarations; they are not definitions. You need to provide definitions of the static member variables, outside of the definition of the class, in one of your . Cpp files.

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