vec! [] or Vec::new ()? : r rust - Reddit 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 . . . - Reddit 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 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
How much faster are arrays that vecs and is my madcap scheme . . . - Reddit 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
Vec lt;String gt; or Vec lt; str gt; 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 I honestly don’t like the rust-analyzer lint of “ {unknown}” argument
Any way to make pushing to `Vec`s faster? : r rust - Reddit 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
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