Vec Front Office

In recent times, vec front office has become increasingly relevant in various contexts. I use vec![] for initialization from a literal list of elements or a pre-allocated repetition of a single value for its similarity to Rust's array initialization syntax. I use Vec::new() for initializing a Vec without a predefined capacity. I never use vec![] or Vec::with_capacity(0).

How to split a vector by an entry and collect all splits into ... Effectively, what I'm doing is making the accumulator a vec of vecs, and it is always ensured to not be empty in the body of the closure itself. Moreover, every item is pushed onto the end of the last vector, and if a 0 is encountered, a new empty vector is pushed as the end element. Equally important, converting vectors to arrays?

For converting arrays to vectors, there's the quite easy "to_vec ()" function. But for the other way around, the only thing I could find was a typecasting function called "try_into", How much faster are arrays that vecs and is my madcap scheme ... a Vec<T> is 3 pointers long, no matter how many elements there are if you know in advance (at runtime) the number of elements you need, you can use Vec::with_capacity to reserve enough space up front - for large arrays, this essentially makes the malloc cost disappear, as the cost of the actual operation dominates the cost of malloc Any efficient way of splitting vector?

In this context, hey guys is there any fast and efficient way of splitting vec into separate n vectors or arrays without blunt iteration and pushing values into each… What's the idiomatic way to move the first element out of a Vec .... I've found that on several occasions I've needed to trade ownership of a Vec for its first element, but have struggled to understand the "correct" way to do this in Rust. Any way to make pushing to `Vec`'s faster? The deep stack in ptr::write feels suspect.

Could it be the case that this is libc memcpy, which is particularly slow for your computer? If you are on Linux, might make sense to try a different libc to see if there’s any different, by compiling for muscl. Also, running under perf stat would be useful, to check things like instruction per cycle, cache misses, etc.

Similarly, how do you actually get someone of the phone at VEC unemployment?. Best thing I tried (in order to get a real person) was emailing my local VEC office on their website, filling out their form and requesting a call back. They do usually call back within two days if you follow this procedure. It’s best if you contact their office at the beginning of the week instead of the end. How to get & [u8] or Vec<u8> from bytes:Bytes?

A place for all things related to the Rust programming language—an open-source systems language that emphasizes performance, reliability, and productivity. Vec<String> or Vec<&str> for function argument? : r/learnrust - Reddit.

If you do want to mutate a Vec, the Vec<String> is probably easier for allocates strings, and Vec<&str> for statics (or lifetime limited to self). First project in rust I went for “String”, then &str, then impl Into<Vec<u8>> only to go back to &str for simplicity.