# Trait ethcore_util::standard::ops::BitAndAssign 1.8.0 [−] [src]

    pub trait BitAndAssign<Rhs = Self> {
        fn bitand_assign(&mut self, Rhs);
    }

The `BitAndAssign` trait is used to specify the functionality of `&=`.

# Examples

In this example, the `&=` operator is lifted to a trivial `Scalar` type.

    use std::ops::BitAndAssign;

    #[derive(Debug, PartialEq)]
    struct Scalar(bool);

    impl BitAndAssign for Scalar {
        // rhs is the "right-hand side" of the expression `a &= b`
        fn bitand_assign(&mut self, rhs: Self) {
            *self = Scalar(self.0 & rhs.0)
        }
    }

    fn main() {
        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));
    }

In this example, the `BitAndAssign` trait is implemented for a `BooleanVector` struct.

    use std::ops::BitAndAssign;

    #[derive(Debug, PartialEq)]
    struct BooleanVector(Vec<bool>);

    impl BitAndAssign for BooleanVector {
        // rhs is the "right-hand side" of the expression `a &= b`
        fn bitand_assign(&mut self, rhs: Self) {
            assert_eq!(self.0.len(), rhs.0.len());
            *self = BooleanVector(self.0
                                      .iter()
                                      .zip(rhs.0.iter())
                                      .map(|(x, y)| *x && *y)
                                      .collect());
        }
    }

    fn main() {
        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);
    }

## Required Methods

### `fn bitand_assign(&mut self, Rhs)`

The method for the `&=` operator

## Implementors

- `impl BitAndAssign<Wrapping<usize>> for Wrapping<usize>`
- `impl BitAndAssign<Wrapping<u8>> for Wrapping<u8>`
- `impl BitAndAssign<Wrapping<u16>> for Wrapping<u16>`
- `impl BitAndAssign<Wrapping<u32>> for Wrapping<u32>`
- `impl BitAndAssign<Wrapping<u64>> for Wrapping<u64>`
- `impl BitAndAssign<Wrapping<isize>> for Wrapping<isize>`
- `impl BitAndAssign<Wrapping<i8>> for Wrapping<i8>`
- `impl BitAndAssign<Wrapping<i16>> for Wrapping<i16>`
- `impl BitAndAssign<Wrapping<i32>> for Wrapping<i32>`
- `impl BitAndAssign<Wrapping<i64>> for Wrapping<i64>`
- `impl BitAndAssign<bool> for bool`
- `impl BitAndAssign<usize> for usize`
- `impl BitAndAssign<u8> for u8`
- `impl BitAndAssign<u16> for u16`
- `impl BitAndAssign<u32> for u32`
- `impl BitAndAssign<u64> for u64`
- `impl BitAndAssign<isize> for isize`
- `impl BitAndAssign<i8> for i8`
- `impl BitAndAssign<i16> for i16`
- `impl BitAndAssign<i32> for i32`
- `impl BitAndAssign<i64> for i64`

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