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rust@octodon.social ("Rust tips") wrote:
If you want to allocate a buffer of uninitialized memory in #Rustlang, the easiest way is `Vec::with_capacity(len)`.
Get the buffer with `vec.as_mut_ptr()` for C APIs, or `&mut vec.spare_capacity_mut()[..len]` for Rust. Spare capacity needs extra slicing, because `Vec` reserves the right to have a larger capacity than requested. Once the buffer is filled, use `vec.set_len(len)` to make the data safe to access.