Hi Leon, I believe you've run into C++ (ISO 14882) convenient implicit conversion to bool from pointers, integrals and floating points. Your enum is an integral. q.v.: Stroustrup C++PL C.6.2.5 Boolean Conversions As far as I am aware, there is no mechanism to disable the implicit conversion in your situation (other than change your code to avoid using bool as a parameter). HTH, --Eljay
