This video is an interview with a C++ developer candidate. The interviewer tests the candidate's knowledge on various C++ concepts, including smart pointers, concurrency, memory ordering, struct padding, templates, move semantics, data structures (vectors and deques), and C++ features like if constexpr. The candidate demonstrates a good understanding of many topics, with some areas for further development.
weak_ptr validity checking with lock() and the thread-safety of shared_ptr (specifically its reference counting mechanism).enable_if or = delete and using std::ref to modify arguments passed by copy.const object, which results in a copy, not a move, and a compile-time error if the type doesn't support it.reserve and shrink_to_fit, and the underlying implementation of a deque using an array of pointers to contiguous memory chunks.make_shared vs. shared_ptr(new T): Highlighted the efficiency and exception safety benefits of make_shared due to single memory allocation for the control block and the object.if constexpr and its behavior in conditional compilation.