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Add speaker notes for unions.

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Andrew Walbran 2023-01-17 16:35:54 +00:00
parent d7fcf8216a
commit 47e28e87c0
1 changed files with 11 additions and 0 deletions
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src/unsafe/unions.md
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@ -15,3 +15,14 @@ fn main() {
println!("bool: {}", unsafe { u.b }); // Undefined behavior! println!("bool: {}", unsafe { u.b }); // Undefined behavior!
} }
``` ```
<details>
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`](https://doc.rust-lang.org/stable/std/mem/fn.transmute.html) or a safe
wrapper such as the [`zerocopy`](https://crates.io/crates/zerocopy) crate.
</details>