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delete the Neg trait bound for CheckedNeg

This commit is contained in:
LEXUGE 2018-04-06 17:06:33 +08:00
parent 138abc7b58
commit 4222b6094f
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GPG Key ID: AE53B4C2E58EDD45
1 changed files with 8 additions and 2 deletions
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10
src/ops/checked.rs
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@ -1,4 +1,4 @@
use core::ops::{Add, Div, Mul, Neg, Rem, Shl, Shr, Sub};
use core::ops::{Add, Div, Mul, Rem, Shl, Shr, Sub};
/// Performs addition that returns `None` instead of wrapping around on
/// overflow.
@ -119,10 +119,16 @@ macro_rules! checked_impl_one_para {
}
}
pub trait CheckedNeg: Sized + Neg<Output = Self> {
pub trait CheckedNeg: Sized {
fn checked_neg(&self) -> Option<Self>;
}
checked_impl_one_para!(CheckedNeg, checked_neg, u8);
checked_impl_one_para!(CheckedNeg, checked_neg, u16);
checked_impl_one_para!(CheckedNeg, checked_neg, u32);
checked_impl_one_para!(CheckedNeg, checked_neg, u64);
checked_impl_one_para!(CheckedNeg, checked_neg, usize);
checked_impl_one_para!(CheckedNeg, checked_neg, i8);
checked_impl_one_para!(CheckedNeg, checked_neg, i16);
checked_impl_one_para!(CheckedNeg, checked_neg, i32);