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| -rw-r--r-- | content/computer/programming/programming_languages/rust.md | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/content/computer/programming/programming_languages/rust.md b/content/computer/programming/programming_languages/rust.md index d7d5c01..b0032bc 100644 --- a/content/computer/programming/programming_languages/rust.md +++ b/content/computer/programming/programming_languages/rust.md @@ -37,3 +37,22 @@ weight = 1 * [clap](https://clap.rs) - State of the art commandline interface building and parsing + +# Notes + +--- + +The Rust standard library actually optimizes zero-size-type allocations away, +for example +[here](https://github.com/rust-lang/rust/blob/866335b337964c79372cd6b1b1213f168efd311f/library/alloc/src/raw_vec.rs#L188), +allocations are prevented if the generic type `T` is zero sized. + +Thus, the following code will never allocate after the first allocation: + +```rust +let _ = std::iter::repeat(()).collect::<Vec<()>>(); +``` + +It does still panic, though, because the element counter overflows. + +--- |