Rust HashSet.difference用法及代码示例

本文简要介绍rust语言中 std::collections::hash_set::HashSet.difference 的用法。

用法

pub fn difference<'a>(    &'a self,     other: &'a HashSet<T, S>) -> Difference<'a, T, S>

访问表示差异的值，即在 self 但不在 other 中的值。

例子

use std::collections::HashSet;
let a: HashSet<_> = [1, 2, 3].iter().cloned().collect();
let b: HashSet<_> = [4, 2, 3, 4].iter().cloned().collect();

// Can be seen as `a - b`.
for x in a.difference(&b) {
    println!("{}", x); // Print 1
}

let diff: HashSet<_> = a.difference(&b).collect();
assert_eq!(diff, [1].iter().collect());

// Note that difference is not symmetric,
// and `b - a` means something else:
let diff: HashSet<_> = b.difference(&a).collect();
assert_eq!(diff, [4].iter().collect());

相关用法

注：本文由纯净天空筛选整理自rust-lang.org大神的英文原创作品 std::collections::hash_set::HashSet.difference。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。