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Diffstat (limited to 'library/core/src/ops/bit.rs')
| -rw-r--r-- | library/core/src/ops/bit.rs | 873 |
1 files changed, 873 insertions, 0 deletions
diff --git a/library/core/src/ops/bit.rs b/library/core/src/ops/bit.rs new file mode 100644 index 00000000000..bcfff4a223b --- /dev/null +++ b/library/core/src/ops/bit.rs @@ -0,0 +1,873 @@ +/// The unary logical negation operator `!`. +/// +/// # Examples +/// +/// An implementation of `Not` for `Answer`, which enables the use of `!` to +/// invert its value. +/// +/// ``` +/// use std::ops::Not; +/// +/// #[derive(Debug, PartialEq)] +/// enum Answer { +/// Yes, +/// No, +/// } +/// +/// impl Not for Answer { +/// type Output = Answer; +/// +/// fn not(self) -> Self::Output { +/// match self { +/// Answer::Yes => Answer::No, +/// Answer::No => Answer::Yes +/// } +/// } +/// } +/// +/// assert_eq!(!Answer::Yes, Answer::No); +/// assert_eq!(!Answer::No, Answer::Yes); +/// ``` +#[lang = "not"] +#[stable(feature = "rust1", since = "1.0.0")] +pub trait Not { + /// The resulting type after applying the `!` operator. + #[stable(feature = "rust1", since = "1.0.0")] + type Output; + + /// Performs the unary `!` operation. + #[must_use] + #[stable(feature = "rust1", since = "1.0.0")] + fn not(self) -> Self::Output; +} + +macro_rules! not_impl { + ($($t:ty)*) => ($( + #[stable(feature = "rust1", since = "1.0.0")] + impl Not for $t { + type Output = $t; + + #[inline] + fn not(self) -> $t { !self } + } + + forward_ref_unop! { impl Not, not for $t } + )*) +} + +not_impl! { bool usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 } + +/// The bitwise AND operator `&`. +/// +/// Note that `Rhs` is `Self` by default, but this is not mandatory. +/// +/// # Examples +/// +/// An implementation of `BitAnd` for a wrapper around `bool`. +/// +/// ``` +/// use std::ops::BitAnd; +/// +/// #[derive(Debug, PartialEq)] +/// struct Scalar(bool); +/// +/// impl BitAnd for Scalar { +/// type Output = Self; +/// +/// // rhs is the "right-hand side" of the expression `a & b` +/// fn bitand(self, rhs: Self) -> Self::Output { +/// Scalar(self.0 & rhs.0) +/// } +/// } +/// +/// assert_eq!(Scalar(true) & Scalar(true), Scalar(true)); +/// assert_eq!(Scalar(true) & Scalar(false), Scalar(false)); +/// assert_eq!(Scalar(false) & Scalar(true), Scalar(false)); +/// assert_eq!(Scalar(false) & Scalar(false), Scalar(false)); +/// ``` +/// +/// An implementation of `BitAnd` for a wrapper around `Vec<bool>`. +/// +/// ``` +/// use std::ops::BitAnd; +/// +/// #[derive(Debug, PartialEq)] +/// struct BooleanVector(Vec<bool>); +/// +/// impl BitAnd for BooleanVector { +/// type Output = Self; +/// +/// fn bitand(self, BooleanVector(rhs): Self) -> Self::Output { +/// let BooleanVector(lhs) = self; +/// assert_eq!(lhs.len(), rhs.len()); +/// BooleanVector(lhs.iter().zip(rhs.iter()).map(|(x, y)| *x && *y).collect()) +/// } +/// } +/// +/// let bv1 = BooleanVector(vec![true, true, false, false]); +/// let bv2 = BooleanVector(vec![true, false, true, false]); +/// let expected = BooleanVector(vec![true, false, false, false]); +/// assert_eq!(bv1 & bv2, expected); +/// ``` +#[lang = "bitand"] +#[doc(alias = "&")] +#[stable(feature = "rust1", since = "1.0.0")] +#[rustc_on_unimplemented( + message = "no implementation for `{Self} & {Rhs}`", + label = "no implementation for `{Self} & {Rhs}`" +)] +pub trait BitAnd<Rhs = Self> { + /// The resulting type after applying the `&` operator. + #[stable(feature = "rust1", since = "1.0.0")] + type Output; + + /// Performs the `&` operation. + #[must_use] + #[stable(feature = "rust1", since = "1.0.0")] + fn bitand(self, rhs: Rhs) -> Self::Output; +} + +macro_rules! bitand_impl { + ($($t:ty)*) => ($( + #[stable(feature = "rust1", since = "1.0.0")] + impl BitAnd for $t { + type Output = $t; + + #[inline] + fn bitand(self, rhs: $t) -> $t { self & rhs } + } + + forward_ref_binop! { impl BitAnd, bitand for $t, $t } + )*) +} + +bitand_impl! { bool usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 } + +/// The bitwise OR operator `|`. +/// +/// Note that `Rhs` is `Self` by default, but this is not mandatory. +/// +/// # Examples +/// +/// An implementation of `BitOr` for a wrapper around `bool`. +/// +/// ``` +/// use std::ops::BitOr; +/// +/// #[derive(Debug, PartialEq)] +/// struct Scalar(bool); +/// +/// impl BitOr for Scalar { +/// type Output = Self; +/// +/// // rhs is the "right-hand side" of the expression `a | b` +/// fn bitor(self, rhs: Self) -> Self { +/// Scalar(self.0 | rhs.0) +/// } +/// } +/// +/// assert_eq!(Scalar(true) | Scalar(true), Scalar(true)); +/// assert_eq!(Scalar(true) | Scalar(false), Scalar(true)); +/// assert_eq!(Scalar(false) | Scalar(true), Scalar(true)); +/// assert_eq!(Scalar(false) | Scalar(false), Scalar(false)); +/// ``` +/// +/// An implementation of `BitOr` for a wrapper around `Vec<bool>`. +/// +/// ``` +/// use std::ops::BitOr; +/// +/// #[derive(Debug, PartialEq)] +/// struct BooleanVector(Vec<bool>); +/// +/// impl BitOr for BooleanVector { +/// type Output = Self; +/// +/// fn bitor(self, BooleanVector(rhs): Self) -> Self::Output { +/// let BooleanVector(lhs) = self; +/// assert_eq!(lhs.len(), rhs.len()); +/// BooleanVector(lhs.iter().zip(rhs.iter()).map(|(x, y)| *x || *y).collect()) +/// } +/// } +/// +/// let bv1 = BooleanVector(vec![true, true, false, false]); +/// let bv2 = BooleanVector(vec![true, false, true, false]); +/// let expected = BooleanVector(vec![true, true, true, false]); +/// assert_eq!(bv1 | bv2, expected); +/// ``` +#[lang = "bitor"] +#[doc(alias = "|")] +#[stable(feature = "rust1", since = "1.0.0")] +#[rustc_on_unimplemented( + message = "no implementation for `{Self} | {Rhs}`", + label = "no implementation for `{Self} | {Rhs}`" +)] +pub trait BitOr<Rhs = Self> { + /// The resulting type after applying the `|` operator. + #[stable(feature = "rust1", since = "1.0.0")] + type Output; + + /// Performs the `|` operation. + #[must_use] + #[stable(feature = "rust1", since = "1.0.0")] + fn bitor(self, rhs: Rhs) -> Self::Output; +} + +macro_rules! bitor_impl { + ($($t:ty)*) => ($( + #[stable(feature = "rust1", since = "1.0.0")] + impl BitOr for $t { + type Output = $t; + + #[inline] + fn bitor(self, rhs: $t) -> $t { self | rhs } + } + + forward_ref_binop! { impl BitOr, bitor for $t, $t } + )*) +} + +bitor_impl! { bool usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 } + +/// The bitwise XOR operator `^`. +/// +/// Note that `Rhs` is `Self` by default, but this is not mandatory. +/// +/// # Examples +/// +/// An implementation of `BitXor` that lifts `^` to a wrapper around `bool`. +/// +/// ``` +/// use std::ops::BitXor; +/// +/// #[derive(Debug, PartialEq)] +/// struct Scalar(bool); +/// +/// impl BitXor for Scalar { +/// type Output = Self; +/// +/// // rhs is the "right-hand side" of the expression `a ^ b` +/// fn bitxor(self, rhs: Self) -> Self::Output { +/// Scalar(self.0 ^ rhs.0) +/// } +/// } +/// +/// assert_eq!(Scalar(true) ^ Scalar(true), Scalar(false)); +/// assert_eq!(Scalar(true) ^ Scalar(false), Scalar(true)); +/// assert_eq!(Scalar(false) ^ Scalar(true), Scalar(true)); +/// assert_eq!(Scalar(false) ^ Scalar(false), Scalar(false)); +/// ``` +/// +/// An implementation of `BitXor` trait for a wrapper around `Vec<bool>`. +/// +/// ``` +/// use std::ops::BitXor; +/// +/// #[derive(Debug, PartialEq)] +/// struct BooleanVector(Vec<bool>); +/// +/// impl BitXor for BooleanVector { +/// type Output = Self; +/// +/// fn bitxor(self, BooleanVector(rhs): Self) -> Self::Output { +/// let BooleanVector(lhs) = self; +/// assert_eq!(lhs.len(), rhs.len()); +/// BooleanVector(lhs.iter() +/// .zip(rhs.iter()) +/// .map(|(x, y)| (*x || *y) && !(*x && *y)) +/// .collect()) +/// } +/// } +/// +/// let bv1 = BooleanVector(vec![true, true, false, false]); +/// let bv2 = BooleanVector(vec![true, false, true, false]); +/// let expected = BooleanVector(vec![false, true, true, false]); +/// assert_eq!(bv1 ^ bv2, expected); +/// ``` +#[lang = "bitxor"] +#[doc(alias = "^")] +#[stable(feature = "rust1", since = "1.0.0")] +#[rustc_on_unimplemented( + message = "no implementation for `{Self} ^ {Rhs}`", + label = "no implementation for `{Self} ^ {Rhs}`" +)] +pub trait BitXor<Rhs = Self> { + /// The resulting type after applying the `^` operator. + #[stable(feature = "rust1", since = "1.0.0")] + type Output; + + /// Performs the `^` operation. + #[must_use] + #[stable(feature = "rust1", since = "1.0.0")] + fn bitxor(self, rhs: Rhs) -> Self::Output; +} + +macro_rules! bitxor_impl { + ($($t:ty)*) => ($( + #[stable(feature = "rust1", since = "1.0.0")] + impl BitXor for $t { + type Output = $t; + + #[inline] + fn bitxor(self, other: $t) -> $t { self ^ other } + } + + forward_ref_binop! { impl BitXor, bitxor for $t, $t } + )*) +} + +bitxor_impl! { bool usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 } + +/// The left shift operator `<<`. Note that because this trait is implemented +/// for all integer types with multiple right-hand-side types, Rust's type +/// checker has special handling for `_ << _`, setting the result type for +/// integer operations to the type of the left-hand-side operand. This means +/// that though `a << b` and `a.shl(b)` are one and the same from an evaluation +/// standpoint, they are different when it comes to type inference. +/// +/// # Examples +/// +/// An implementation of `Shl` that lifts the `<<` operation on integers to a +/// wrapper around `usize`. +/// +/// ``` +/// use std::ops::Shl; +/// +/// #[derive(PartialEq, Debug)] +/// struct Scalar(usize); +/// +/// impl Shl<Scalar> for Scalar { +/// type Output = Self; +/// +/// fn shl(self, Scalar(rhs): Self) -> Scalar { +/// let Scalar(lhs) = self; +/// Scalar(lhs << rhs) +/// } +/// } +/// +/// assert_eq!(Scalar(4) << Scalar(2), Scalar(16)); +/// ``` +/// +/// An implementation of `Shl` that spins a vector leftward by a given amount. +/// +/// ``` +/// use std::ops::Shl; +/// +/// #[derive(PartialEq, Debug)] +/// struct SpinVector<T: Clone> { +/// vec: Vec<T>, +/// } +/// +/// impl<T: Clone> Shl<usize> for SpinVector<T> { +/// type Output = Self; +/// +/// fn shl(self, rhs: usize) -> Self::Output { +/// // Rotate the vector by `rhs` places. +/// let (a, b) = self.vec.split_at(rhs); +/// let mut spun_vector: Vec<T> = vec![]; +/// spun_vector.extend_from_slice(b); +/// spun_vector.extend_from_slice(a); +/// SpinVector { vec: spun_vector } +/// } +/// } +/// +/// assert_eq!(SpinVector { vec: vec![0, 1, 2, 3, 4] } << 2, +/// SpinVector { vec: vec![2, 3, 4, 0, 1] }); +/// ``` +#[lang = "shl"] +#[doc(alias = "<<")] +#[stable(feature = "rust1", since = "1.0.0")] +#[rustc_on_unimplemented( + message = "no implementation for `{Self} << {Rhs}`", + label = "no implementation for `{Self} << {Rhs}`" +)] +pub trait Shl<Rhs = Self> { + /// The resulting type after applying the `<<` operator. + #[stable(feature = "rust1", since = "1.0.0")] + type Output; + + /// Performs the `<<` operation. + #[must_use] + #[stable(feature = "rust1", since = "1.0.0")] + fn shl(self, rhs: Rhs) -> Self::Output; +} + +macro_rules! shl_impl { + ($t:ty, $f:ty) => { + #[stable(feature = "rust1", since = "1.0.0")] + impl Shl<$f> for $t { + type Output = $t; + + #[inline] + #[rustc_inherit_overflow_checks] + fn shl(self, other: $f) -> $t { + self << other + } + } + + forward_ref_binop! { impl Shl, shl for $t, $f } + }; +} + +macro_rules! shl_impl_all { + ($($t:ty)*) => ($( + shl_impl! { $t, u8 } + shl_impl! { $t, u16 } + shl_impl! { $t, u32 } + shl_impl! { $t, u64 } + shl_impl! { $t, u128 } + shl_impl! { $t, usize } + + shl_impl! { $t, i8 } + shl_impl! { $t, i16 } + shl_impl! { $t, i32 } + shl_impl! { $t, i64 } + shl_impl! { $t, i128 } + shl_impl! { $t, isize } + )*) +} + +shl_impl_all! { u8 u16 u32 u64 u128 usize i8 i16 i32 i64 isize i128 } + +/// The right shift operator `>>`. Note that because this trait is implemented +/// for all integer types with multiple right-hand-side types, Rust's type +/// checker has special handling for `_ >> _`, setting the result type for +/// integer operations to the type of the left-hand-side operand. This means +/// that though `a >> b` and `a.shr(b)` are one and the same from an evaluation +/// standpoint, they are different when it comes to type inference. +/// +/// # Examples +/// +/// An implementation of `Shr` that lifts the `>>` operation on integers to a +/// wrapper around `usize`. +/// +/// ``` +/// use std::ops::Shr; +/// +/// #[derive(PartialEq, Debug)] +/// struct Scalar(usize); +/// +/// impl Shr<Scalar> for Scalar { +/// type Output = Self; +/// +/// fn shr(self, Scalar(rhs): Self) -> Scalar { +/// let Scalar(lhs) = self; +/// Scalar(lhs >> rhs) +/// } +/// } +/// +/// assert_eq!(Scalar(16) >> Scalar(2), Scalar(4)); +/// ``` +/// +/// An implementation of `Shr` that spins a vector rightward by a given amount. +/// +/// ``` +/// use std::ops::Shr; +/// +/// #[derive(PartialEq, Debug)] +/// struct SpinVector<T: Clone> { +/// vec: Vec<T>, +/// } +/// +/// impl<T: Clone> Shr<usize> for SpinVector<T> { +/// type Output = Self; +/// +/// fn shr(self, rhs: usize) -> Self::Output { +/// // Rotate the vector by `rhs` places. +/// let (a, b) = self.vec.split_at(self.vec.len() - rhs); +/// let mut spun_vector: Vec<T> = vec![]; +/// spun_vector.extend_from_slice(b); +/// spun_vector.extend_from_slice(a); +/// SpinVector { vec: spun_vector } +/// } +/// } +/// +/// assert_eq!(SpinVector { vec: vec![0, 1, 2, 3, 4] } >> 2, +/// SpinVector { vec: vec![3, 4, 0, 1, 2] }); +/// ``` +#[lang = "shr"] +#[doc(alias = ">>")] +#[stable(feature = "rust1", since = "1.0.0")] +#[rustc_on_unimplemented( + message = "no implementation for `{Self} >> {Rhs}`", + label = "no implementation for `{Self} >> {Rhs}`" +)] +pub trait Shr<Rhs = Self> { + /// The resulting type after applying the `>>` operator. + #[stable(feature = "rust1", since = "1.0.0")] + type Output; + + /// Performs the `>>` operation. + #[must_use] + #[stable(feature = "rust1", since = "1.0.0")] + fn shr(self, rhs: Rhs) -> Self::Output; +} + +macro_rules! shr_impl { + ($t:ty, $f:ty) => { + #[stable(feature = "rust1", since = "1.0.0")] + impl Shr<$f> for $t { + type Output = $t; + + #[inline] + #[rustc_inherit_overflow_checks] + fn shr(self, other: $f) -> $t { + self >> other + } + } + + forward_ref_binop! { impl Shr, shr for $t, $f } + }; +} + +macro_rules! shr_impl_all { + ($($t:ty)*) => ($( + shr_impl! { $t, u8 } + shr_impl! { $t, u16 } + shr_impl! { $t, u32 } + shr_impl! { $t, u64 } + shr_impl! { $t, u128 } + shr_impl! { $t, usize } + + shr_impl! { $t, i8 } + shr_impl! { $t, i16 } + shr_impl! { $t, i32 } + shr_impl! { $t, i64 } + shr_impl! { $t, i128 } + shr_impl! { $t, isize } + )*) +} + +shr_impl_all! { u8 u16 u32 u64 u128 usize i8 i16 i32 i64 i128 isize } + +/// The bitwise AND assignment operator `&=`. +/// +/// # Examples +/// +/// An implementation of `BitAndAssign` that lifts the `&=` operator to a +/// wrapper around `bool`. +/// +/// ``` +/// 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) +/// } +/// } +/// +/// 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)); +/// ``` +/// +/// Here, the `BitAndAssign` trait is implemented for a wrapper around +/// `Vec<bool>`. +/// +/// ``` +/// 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()); +/// } +/// } +/// +/// 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); +/// ``` +#[lang = "bitand_assign"] +#[doc(alias = "&=")] +#[stable(feature = "op_assign_traits", since = "1.8.0")] +#[rustc_on_unimplemented( + message = "no implementation for `{Self} &= {Rhs}`", + label = "no implementation for `{Self} &= {Rhs}`" +)] +pub trait BitAndAssign<Rhs = Self> { + /// Performs the `&=` operation. + #[stable(feature = "op_assign_traits", since = "1.8.0")] + fn bitand_assign(&mut self, rhs: Rhs); +} + +macro_rules! bitand_assign_impl { + ($($t:ty)+) => ($( + #[stable(feature = "op_assign_traits", since = "1.8.0")] + impl BitAndAssign for $t { + #[inline] + fn bitand_assign(&mut self, other: $t) { *self &= other } + } + + forward_ref_op_assign! { impl BitAndAssign, bitand_assign for $t, $t } + )+) +} + +bitand_assign_impl! { bool usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 } + +/// The bitwise OR assignment operator `|=`. +/// +/// # Examples +/// +/// ``` +/// use std::ops::BitOrAssign; +/// +/// #[derive(Debug, PartialEq)] +/// struct PersonalPreferences { +/// likes_cats: bool, +/// likes_dogs: bool, +/// } +/// +/// impl BitOrAssign for PersonalPreferences { +/// fn bitor_assign(&mut self, rhs: Self) { +/// self.likes_cats |= rhs.likes_cats; +/// self.likes_dogs |= rhs.likes_dogs; +/// } +/// } +/// +/// let mut prefs = PersonalPreferences { likes_cats: true, likes_dogs: false }; +/// prefs |= PersonalPreferences { likes_cats: false, likes_dogs: true }; +/// assert_eq!(prefs, PersonalPreferences { likes_cats: true, likes_dogs: true }); +/// ``` +#[lang = "bitor_assign"] +#[doc(alias = "|=")] +#[stable(feature = "op_assign_traits", since = "1.8.0")] +#[rustc_on_unimplemented( + message = "no implementation for `{Self} |= {Rhs}`", + label = "no implementation for `{Self} |= {Rhs}`" +)] +pub trait BitOrAssign<Rhs = Self> { + /// Performs the `|=` operation. + #[stable(feature = "op_assign_traits", since = "1.8.0")] + fn bitor_assign(&mut self, rhs: Rhs); +} + +macro_rules! bitor_assign_impl { + ($($t:ty)+) => ($( + #[stable(feature = "op_assign_traits", since = "1.8.0")] + impl BitOrAssign for $t { + #[inline] + fn bitor_assign(&mut self, other: $t) { *self |= other } + } + + forward_ref_op_assign! { impl BitOrAssign, bitor_assign for $t, $t } + )+) +} + +bitor_assign_impl! { bool usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 } + +/// The bitwise XOR assignment operator `^=`. +/// +/// # Examples +/// +/// ``` +/// use std::ops::BitXorAssign; +/// +/// #[derive(Debug, PartialEq)] +/// struct Personality { +/// has_soul: bool, +/// likes_knitting: bool, +/// } +/// +/// impl BitXorAssign for Personality { +/// fn bitxor_assign(&mut self, rhs: Self) { +/// self.has_soul ^= rhs.has_soul; +/// self.likes_knitting ^= rhs.likes_knitting; +/// } +/// } +/// +/// let mut personality = Personality { has_soul: false, likes_knitting: true }; +/// personality ^= Personality { has_soul: true, likes_knitting: true }; +/// assert_eq!(personality, Personality { has_soul: true, likes_knitting: false}); +/// ``` +#[lang = "bitxor_assign"] +#[doc(alias = "^=")] +#[stable(feature = "op_assign_traits", since = "1.8.0")] +#[rustc_on_unimplemented( + message = "no implementation for `{Self} ^= {Rhs}`", + label = "no implementation for `{Self} ^= {Rhs}`" +)] +pub trait BitXorAssign<Rhs = Self> { + /// Performs the `^=` operation. + #[stable(feature = "op_assign_traits", since = "1.8.0")] + fn bitxor_assign(&mut self, rhs: Rhs); +} + +macro_rules! bitxor_assign_impl { + ($($t:ty)+) => ($( + #[stable(feature = "op_assign_traits", since = "1.8.0")] + impl BitXorAssign for $t { + #[inline] + fn bitxor_assign(&mut self, other: $t) { *self ^= other } + } + + forward_ref_op_assign! { impl BitXorAssign, bitxor_assign for $t, $t } + )+) +} + +bitxor_assign_impl! { bool usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 } + +/// The left shift assignment operator `<<=`. +/// +/// # Examples +/// +/// An implementation of `ShlAssign` for a wrapper around `usize`. +/// +/// ``` +/// use std::ops::ShlAssign; +/// +/// #[derive(Debug, PartialEq)] +/// struct Scalar(usize); +/// +/// impl ShlAssign<usize> for Scalar { +/// fn shl_assign(&mut self, rhs: usize) { +/// self.0 <<= rhs; +/// } +/// } +/// +/// let mut scalar = Scalar(4); +/// scalar <<= 2; +/// assert_eq!(scalar, Scalar(16)); +/// ``` +#[lang = "shl_assign"] +#[doc(alias = "<<=")] +#[stable(feature = "op_assign_traits", since = "1.8.0")] +#[rustc_on_unimplemented( + message = "no implementation for `{Self} <<= {Rhs}`", + label = "no implementation for `{Self} <<= {Rhs}`" +)] +pub trait ShlAssign<Rhs = Self> { + /// Performs the `<<=` operation. + #[stable(feature = "op_assign_traits", since = "1.8.0")] + fn shl_assign(&mut self, rhs: Rhs); +} + +macro_rules! shl_assign_impl { + ($t:ty, $f:ty) => { + #[stable(feature = "op_assign_traits", since = "1.8.0")] + impl ShlAssign<$f> for $t { + #[inline] + #[rustc_inherit_overflow_checks] + fn shl_assign(&mut self, other: $f) { + *self <<= other + } + } + + forward_ref_op_assign! { impl ShlAssign, shl_assign for $t, $f } + }; +} + +macro_rules! shl_assign_impl_all { + ($($t:ty)*) => ($( + shl_assign_impl! { $t, u8 } + shl_assign_impl! { $t, u16 } + shl_assign_impl! { $t, u32 } + shl_assign_impl! { $t, u64 } + shl_assign_impl! { $t, u128 } + shl_assign_impl! { $t, usize } + + shl_assign_impl! { $t, i8 } + shl_assign_impl! { $t, i16 } + shl_assign_impl! { $t, i32 } + shl_assign_impl! { $t, i64 } + shl_assign_impl! { $t, i128 } + shl_assign_impl! { $t, isize } + )*) +} + +shl_assign_impl_all! { u8 u16 u32 u64 u128 usize i8 i16 i32 i64 i128 isize } + +/// The right shift assignment operator `>>=`. +/// +/// # Examples +/// +/// An implementation of `ShrAssign` for a wrapper around `usize`. +/// +/// ``` +/// use std::ops::ShrAssign; +/// +/// #[derive(Debug, PartialEq)] +/// struct Scalar(usize); +/// +/// impl ShrAssign<usize> for Scalar { +/// fn shr_assign(&mut self, rhs: usize) { +/// self.0 >>= rhs; +/// } +/// } +/// +/// let mut scalar = Scalar(16); +/// scalar >>= 2; +/// assert_eq!(scalar, Scalar(4)); +/// ``` +#[lang = "shr_assign"] +#[doc(alias = ">>=")] +#[stable(feature = "op_assign_traits", since = "1.8.0")] +#[rustc_on_unimplemented( + message = "no implementation for `{Self} >>= {Rhs}`", + label = "no implementation for `{Self} >>= {Rhs}`" +)] +pub trait ShrAssign<Rhs = Self> { + /// Performs the `>>=` operation. + #[stable(feature = "op_assign_traits", since = "1.8.0")] + fn shr_assign(&mut self, rhs: Rhs); +} + +macro_rules! shr_assign_impl { + ($t:ty, $f:ty) => { + #[stable(feature = "op_assign_traits", since = "1.8.0")] + impl ShrAssign<$f> for $t { + #[inline] + #[rustc_inherit_overflow_checks] + fn shr_assign(&mut self, other: $f) { + *self >>= other + } + } + + forward_ref_op_assign! { impl ShrAssign, shr_assign for $t, $f } + }; +} + +macro_rules! shr_assign_impl_all { + ($($t:ty)*) => ($( + shr_assign_impl! { $t, u8 } + shr_assign_impl! { $t, u16 } + shr_assign_impl! { $t, u32 } + shr_assign_impl! { $t, u64 } + shr_assign_impl! { $t, u128 } + shr_assign_impl! { $t, usize } + + shr_assign_impl! { $t, i8 } + shr_assign_impl! { $t, i16 } + shr_assign_impl! { $t, i32 } + shr_assign_impl! { $t, i64 } + shr_assign_impl! { $t, i128 } + shr_assign_impl! { $t, isize } + )*) +} + +shr_assign_impl_all! { u8 u16 u32 u64 u128 usize i8 i16 i32 i64 i128 isize } |