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NonZero abs.

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This commit is contained in:
Iago-lito 2021-04-15 12:18:04 +02:00
parent f7a1a9d075
commit a433b06347
1 changed files with 45 additions and 0 deletions
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45
library/core/src/num/nonzero.rs
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@ -429,6 +429,51 @@ nonzero_unsigned_operations! {
NonZeroUsize(usize);
}
// A bunch of methods for signed nonzero types only.
macro_rules! nonzero_signed_operations {
( $( $Ty: ident($Int: ty) -> $Uty: ident($Uint: ty); )+ ) => {
$(
impl $Ty {
/// Computes the absolute value of self.
#[doc = concat!("See [`", stringify!($Int), "::abs`]")]
/// for documentation on overflow behaviour.
///
/// # Example
///
/// ```
/// #![feature(nonzero_ops)]
/// # #![feature(try_trait)]
#[doc = concat!("# use std::num::", stringify!($Ty), ";")]
///
/// # fn main() -> Result<(), std::option::NoneError> {
#[doc = concat!("let pos = ", stringify!($Ty), "::new(1)?;")]
#[doc = concat!("let neg = ", stringify!($Ty), "::new(-1)?;")]
///
/// assert_eq!(pos, pos.abs());
/// assert_eq!(pos, neg.abs());
/// # Ok(())
/// # }
/// ```
#[unstable(feature = "nonzero_ops", issue = "84186")]
#[inline]
pub const fn abs(self) -> $Ty {
// SAFETY: This cannot overflow to zero.
unsafe { $Ty::new_unchecked(self.get().abs()) }
}
}
)+
}
}
nonzero_signed_operations! {
NonZeroI8(i8) -> NonZeroU8(u8);
NonZeroI16(i16) -> NonZeroU16(u16);
NonZeroI32(i32) -> NonZeroU32(u32);
NonZeroI64(i64) -> NonZeroU64(u64);
NonZeroI128(i128) -> NonZeroU128(u128);
NonZeroIsize(isize) -> NonZeroUsize(usize);
}
macro_rules! nonzero_unsigned_is_power_of_two {
( $( $Ty: ident )+ ) => {
$(