Boeing Lead C++ Developer interview questions

1) Size of Base and derived class with and without virtual keyword 2) Size of Empty class 3) Usage of static, volatile, explicit keyword 4) what is emplace 5) Thread proof Singleton 6) Usage of Mutex , Spinlock and Semaphore 7) Experience on linux service 8) How to read data from console 9) Current project architecture 10) Embedded C++ experience