我正在使用人造丝来产生相当大的返回值。将所有返回值收集到Vec
. 有没有办法避免创建Vec
并直接作为可迭代对象使用?
这是一个不起作用的示例:
fn main() {
let numbers: Vec<_> = "12.03 0.3 44.2 45 zzz".split_whitespace().collect();
let x = numbers
.par_iter()
.map(|n| n.parse::<f32>())
.filter_map(|n| n.ok());
for n in x {
println!("{:?}", n);
}
}
error[E0277]: the trait bound `rayon::iter::FilterMap<rayon::iter::Map<rayon::slice::Iter<'_, &str>, [closure@src/main.rs:10:14: 10:34]>, [closure@src/main.rs:11:21: 11:31]>: std::iter::Iterator` is not satisfied
|
13 | for n in x {
| ^ `rayon::iter::FilterMap<rayon::iter::Map<rayon::slice::Iter<'_, &str>, [closure@src/main.rs:10:14: 10:34]>, [closure@src/main.rs:11:21: 11:31]>` is not an iterator; maybe try calling `.iter()` or a similar method
|
= help: the trait `std::iter::Iterator` is not implemented for `rayon::iter::FilterMap<rayon::iter::Map<rayon::slice::Iter<'_, &str>, [closure@src/main.rs:10:14: 10:34]>, [closure@src/main.rs:11:21: 11:31]>`
= note: required by `std::iter::IntoIterator::into_iter`