Trait core::ops::BitAndAssign
1.8.0 · source · pub trait BitAndAssign<Rhs = Self> {
// Required method
fn bitand_assign(&mut self, rhs: Rhs);
}Expand description
按位与赋值运算符 &=。
Examples
BitAndAssign 的实现，将 &= 运算符提升为 bool 的包装器。
use std::ops::BitAndAssign;
#[derive(Debug, PartialEq)]
struct Scalar(bool);
impl BitAndAssign for Scalar {
// rhs 是表达式 `a &= b` 的 "right-hand side"
fn bitand_assign(&mut self, rhs: Self) {
*self = Self(self.0 & rhs.0)
}
}
let mut scalar = Scalar(true);
scalar &= Scalar(true);
assert_eq!(scalar, Scalar(true));
let mut scalar = Scalar(true);
scalar &= Scalar(false);
assert_eq!(scalar, Scalar(false));
let mut scalar = Scalar(false);
scalar &= Scalar(true);
assert_eq!(scalar, Scalar(false));
let mut scalar = Scalar(false);
scalar &= Scalar(false);
assert_eq!(scalar, Scalar(false));这里，BitAndAssign trait 是为 Vec<bool> 周围的包装器实现的。
use std::ops::BitAndAssign;
#[derive(Debug, PartialEq)]
struct BooleanVector(Vec<bool>);
impl BitAndAssign for BooleanVector {
// `rhs` 是表达式 `a &= b` 的 "right-hand side"。
fn bitand_assign(&mut self, rhs: Self) {
assert_eq!(self.0.len(), rhs.0.len());
*self = Self(
self.0
.iter()
.zip(rhs.0.iter())
.map(|(x, y)| *x & *y)
.collect()
);
}
}
let mut bv = BooleanVector(vec![true, true, false, false]);
bv &= BooleanVector(vec![true, false, true, false]);
let expected = BooleanVector(vec![true, false, false, false]);
assert_eq!(bv, expected);