聯合體
聯合體和列舉很像,但您需要自行追蹤可用欄位:
Speaker Notes
This slide should take about 5 minutes.
Unions are very rarely needed in Rust as you can usually use an enum. They are occasionally needed for interacting with C library APIs.
If you just want to reinterpret bytes as a different type, you probably want std::mem::transmute
or a safe wrapper such as the zerocopy
crate.