_ZdaPv _ZdaPvRKSt9nothrow_t _ZdlPv _ZdlPvRKSt9nothrow_t _Znaj _ZnajRKSt9nothrow_t _Znwj _ZnwjRKSt9nothrow_t __cxa_guard_abort __cxa_guard_acquire __cxa_guard_release __cxa_pure_virtual