this post was submitted on 08 Mar 2025
10 points (91.7% liked)

Rust Programming

8553 readers
2 users here now

founded 5 years ago
MODERATORS
nutomic@lemmy.ml
Joe@lemmy.ml
AgreeableLandscape@lemmy.ml
10
Which is faster? (lemmings.world)
submitted 1 week ago* (last edited 1 week ago) by commander@lemmings.world to c/rust@lemmy.ml
13 comments fedilink hide all child comments
 
let mut variable: Type;
loop {
    variable = value;
}

or

loop {
    let variable: Type = value;
}
you are viewing a single comment's thread
view the rest of the comments
[–] mina86@lemmy.wtf 1 points 5 days ago

This is too simplistic example to give any meaningful answer. What’s Type? What’s value? If it’s i32 and 42 than they both compile to the exact same thing. But if Type is Drop than the second will call the destructor on each iteration. (I’ve also written previously about similar example with BorrowedBuf^1^).