Unimpl Shl, ShlAssign, Shr and ShrAssign for Saturating
This commit is contained in:
Michael Watzko
parent
9f5fc1bd44
commit
0eb41335e2
@ -4,7 +4,7 @@
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use crate::ops::{Add, AddAssign, BitAnd, BitAndAssign, BitOr, BitOrAssign};
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use crate::ops::{Add, AddAssign, BitAnd, BitAndAssign, BitOr, BitOrAssign};
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use crate::ops::{BitXor, BitXorAssign, Div, DivAssign};
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use crate::ops::{BitXor, BitXorAssign, Div, DivAssign};
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use crate::ops::{Mul, MulAssign, Neg, Not, Rem, RemAssign};
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use crate::ops::{Mul, MulAssign, Neg, Not, Rem, RemAssign};
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use crate::ops::{Shl, ShlAssign, Shr, ShrAssign, Sub, SubAssign};
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use crate::ops::{Sub, SubAssign};
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/// Provides intentionally-saturating arithmetic on `T`.
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/// Provides intentionally-saturating arithmetic on `T`.
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///
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///
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@ -79,129 +79,132 @@ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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self.0.fmt(f)
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self.0.fmt(f)
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}
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}
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}
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}
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#[allow(unused_macros)]
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macro_rules! sh_impl_signed {
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($t:ident, $f:ident) => {
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// FIXME what is the correct implementation here? see discussion https://github.com/rust-lang/rust/pull/87921#discussion_r695870065
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//
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// #[unstable(feature = "saturating_int_impl", issue = "87920")]
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// impl Shl<$f> for Saturating<$t> {
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// type Output = Saturating<$t>;
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//
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// #[inline]
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// fn shl(self, other: $f) -> Saturating<$t> {
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// if other < 0 {
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// Saturating(self.0.shr((-other & self::shift_max::$t as $f) as u32))
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// } else {
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// Saturating(self.0.shl((other & self::shift_max::$t as $f) as u32))
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// }
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// }
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// }
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// forward_ref_binop! { impl Shl, shl for Saturating<$t>, $f,
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// #[unstable(feature = "saturating_int_impl", issue = "87920")] }
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//
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// #[unstable(feature = "saturating_int_impl", issue = "87920")]
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// impl ShlAssign<$f> for Saturating<$t> {
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// #[inline]
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// fn shl_assign(&mut self, other: $f) {
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// *self = *self << other;
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// }
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// }
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// forward_ref_op_assign! { impl ShlAssign, shl_assign for Saturating<$t>, $f }
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#[unstable(feature = "saturating_int_impl", issue = "87920")]
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// FIXME the correct implementation is not clear. Waiting for a real world use case at https://github.com/rust-lang/libs-team/issues/230
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impl Shr<$f> for Saturating<$t> {
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//
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type Output = Saturating<$t>;
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// #[allow(unused_macros)]
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// macro_rules! sh_impl_signed {
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#[inline]
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// ($t:ident, $f:ident) => {
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fn shr(self, other: $f) -> Saturating<$t> {
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// // FIXME what is the correct implementation here? see discussion https://github.com/rust-lang/rust/pull/87921#discussion_r695870065
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if other < 0 {
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// //
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Saturating(self.0.shl((-other & self::shift_max::$t as $f) as u32))
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// // #[unstable(feature = "saturating_int_impl", issue = "87920")]
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} else {
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// // impl Shl<$f> for Saturating<$t> {
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Saturating(self.0.shr((other & self::shift_max::$t as $f) as u32))
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// // type Output = Saturating<$t>;
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}
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// //
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}
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// // #[inline]
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}
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// // fn shl(self, other: $f) -> Saturating<$t> {
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forward_ref_binop! { impl Shr, shr for Saturating<$t>, $f,
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// // if other < 0 {
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#[unstable(feature = "saturating_int_impl", issue = "87920")] }
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// // Saturating(self.0.shr((-other & self::shift_max::$t as $f) as u32))
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// // } else {
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#[unstable(feature = "saturating_int_impl", issue = "87920")]
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// // Saturating(self.0.shl((other & self::shift_max::$t as $f) as u32))
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impl ShrAssign<$f> for Saturating<$t> {
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// // }
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#[inline]
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// // }
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fn shr_assign(&mut self, other: $f) {
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// // }
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*self = *self >> other;
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// // forward_ref_binop! { impl Shl, shl for Saturating<$t>, $f,
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}
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// // #[unstable(feature = "saturating_int_impl", issue = "87920")] }
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}
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// //
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forward_ref_op_assign! { impl ShrAssign, shr_assign for Saturating<$t>, $f }
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// // #[unstable(feature = "saturating_int_impl", issue = "87920")]
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};
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// // impl ShlAssign<$f> for Saturating<$t> {
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}
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// // #[inline]
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// // fn shl_assign(&mut self, other: $f) {
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macro_rules! sh_impl_unsigned {
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// // *self = *self << other;
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($t:ident, $f:ident) => {
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// // }
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#[unstable(feature = "saturating_int_impl", issue = "87920")]
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// // }
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impl Shl<$f> for Saturating<$t> {
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// // forward_ref_op_assign! { impl ShlAssign, shl_assign for Saturating<$t>, $f }
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type Output = Saturating<$t>;
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//
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// #[unstable(feature = "saturating_int_impl", issue = "87920")]
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#[inline]
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// impl Shr<$f> for Saturating<$t> {
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fn shl(self, other: $f) -> Saturating<$t> {
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// type Output = Saturating<$t>;
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Saturating(self.0.wrapping_shl(other as u32))
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//
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}
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// #[inline]
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}
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// fn shr(self, other: $f) -> Saturating<$t> {
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forward_ref_binop! { impl Shl, shl for Saturating<$t>, $f,
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// if other < 0 {
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#[unstable(feature = "saturating_int_impl", issue = "87920")] }
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// Saturating(self.0.shl((-other & self::shift_max::$t as $f) as u32))
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// } else {
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#[unstable(feature = "saturating_int_impl", issue = "87920")]
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// Saturating(self.0.shr((other & self::shift_max::$t as $f) as u32))
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impl ShlAssign<$f> for Saturating<$t> {
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// }
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#[inline]
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// }
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fn shl_assign(&mut self, other: $f) {
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// }
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*self = *self << other;
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// forward_ref_binop! { impl Shr, shr for Saturating<$t>, $f,
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}
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// #[unstable(feature = "saturating_int_impl", issue = "87920")] }
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}
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//
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forward_ref_op_assign! { impl ShlAssign, shl_assign for Saturating<$t>, $f }
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// #[unstable(feature = "saturating_int_impl", issue = "87920")]
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// impl ShrAssign<$f> for Saturating<$t> {
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#[unstable(feature = "saturating_int_impl", issue = "87920")]
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// #[inline]
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impl Shr<$f> for Saturating<$t> {
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// fn shr_assign(&mut self, other: $f) {
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type Output = Saturating<$t>;
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// *self = *self >> other;
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// }
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#[inline]
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// }
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fn shr(self, other: $f) -> Saturating<$t> {
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// forward_ref_op_assign! { impl ShrAssign, shr_assign for Saturating<$t>, $f }
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Saturating(self.0.wrapping_shr(other as u32))
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// };
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}
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// }
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}
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//
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forward_ref_binop! { impl Shr, shr for Saturating<$t>, $f,
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// macro_rules! sh_impl_unsigned {
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#[unstable(feature = "saturating_int_impl", issue = "87920")] }
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// ($t:ident, $f:ident) => {
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// #[unstable(feature = "saturating_int_impl", issue = "87920")]
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#[unstable(feature = "saturating_int_impl", issue = "87920")]
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// impl Shl<$f> for Saturating<$t> {
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impl ShrAssign<$f> for Saturating<$t> {
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// type Output = Saturating<$t>;
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#[inline]
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//
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fn shr_assign(&mut self, other: $f) {
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// #[inline]
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*self = *self >> other;
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// fn shl(self, other: $f) -> Saturating<$t> {
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}
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// Saturating(self.0.wrapping_shl(other as u32))
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}
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// }
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forward_ref_op_assign! { impl ShrAssign, shr_assign for Saturating<$t>, $f }
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// }
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};
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// forward_ref_binop! { impl Shl, shl for Saturating<$t>, $f,
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}
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// #[unstable(feature = "saturating_int_impl", issue = "87920")] }
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//
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// FIXME (#23545): uncomment the remaining impls
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// #[unstable(feature = "saturating_int_impl", issue = "87920")]
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macro_rules! sh_impl_all {
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// impl ShlAssign<$f> for Saturating<$t> {
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($($t:ident)*) => ($(
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// #[inline]
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//sh_impl_unsigned! { $t, u8 }
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// fn shl_assign(&mut self, other: $f) {
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//sh_impl_unsigned! { $t, u16 }
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// *self = *self << other;
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//sh_impl_unsigned! { $t, u32 }
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// }
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//sh_impl_unsigned! { $t, u64 }
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// }
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//sh_impl_unsigned! { $t, u128 }
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// forward_ref_op_assign! { impl ShlAssign, shl_assign for Saturating<$t>, $f }
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sh_impl_unsigned! { $t, usize }
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//
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// #[unstable(feature = "saturating_int_impl", issue = "87920")]
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//sh_impl_signed! { $t, i8 }
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// impl Shr<$f> for Saturating<$t> {
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//sh_impl_signed! { $t, i16 }
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// type Output = Saturating<$t>;
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//sh_impl_signed! { $t, i32 }
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//
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//sh_impl_signed! { $t, i64 }
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// #[inline]
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//sh_impl_signed! { $t, i128 }
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// fn shr(self, other: $f) -> Saturating<$t> {
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//sh_impl_signed! { $t, isize }
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// Saturating(self.0.wrapping_shr(other as u32))
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)*)
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// }
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}
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// }
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// forward_ref_binop! { impl Shr, shr for Saturating<$t>, $f,
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sh_impl_all! { u8 u16 u32 u64 u128 usize i8 i16 i32 i64 i128 isize }
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// #[unstable(feature = "saturating_int_impl", issue = "87920")] }
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//
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// #[unstable(feature = "saturating_int_impl", issue = "87920")]
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// impl ShrAssign<$f> for Saturating<$t> {
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// #[inline]
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// fn shr_assign(&mut self, other: $f) {
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// *self = *self >> other;
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// }
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// }
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// forward_ref_op_assign! { impl ShrAssign, shr_assign for Saturating<$t>, $f }
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// };
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// }
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//
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// // FIXME (#23545): uncomment the remaining impls
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// macro_rules! sh_impl_all {
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// ($($t:ident)*) => ($(
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// //sh_impl_unsigned! { $t, u8 }
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// //sh_impl_unsigned! { $t, u16 }
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// //sh_impl_unsigned! { $t, u32 }
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// //sh_impl_unsigned! { $t, u64 }
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// //sh_impl_unsigned! { $t, u128 }
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// sh_impl_unsigned! { $t, usize }
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//
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// //sh_impl_signed! { $t, i8 }
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// //sh_impl_signed! { $t, i16 }
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// //sh_impl_signed! { $t, i32 }
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// //sh_impl_signed! { $t, i64 }
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// //sh_impl_signed! { $t, i128 }
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// //sh_impl_signed! { $t, isize }
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// )*)
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// }
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//
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// sh_impl_all! { u8 u16 u32 u64 u128 usize i8 i16 i32 i64 i128 isize }
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// FIXME(30524): impl Op<T> for Saturating<T>, impl OpAssign<T> for Saturating<T>
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// FIXME(30524): impl Op<T> for Saturating<T>, impl OpAssign<T> for Saturating<T>
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macro_rules! saturating_impl {
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macro_rules! saturating_impl {
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