c - What does the following represent in C

Question

*(uint64_t*) mFrame->first

It's a pointer, structure and then dereferencing? Seems a bit bit convoluted to me. And uint64_t is defined under where?

Answer 1

它将结果mFrame->first转换为指向uint64_t并取消引用它的指针。所以最终的结果是你得到一个uint64_t.