Auto merge of #279 - yoanlcq:impl-num-for-wrapping, r=cuviper
Implemented Zero, One and Num for std::num::Wrapping<T> Attempts to fix issue #278
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@ -1,4 +1,5 @@
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use std::ops::{Add, Mul};
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use std::num::Wrapping;
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/// Defines an additive identity element for `Self`.
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pub trait Zero: Sized + Add<Self, Output = Self> {
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@ -50,6 +51,16 @@ zero_impl!(i64, 0i64);
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zero_impl!(f32, 0.0f32);
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zero_impl!(f64, 0.0f64);
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impl<T: Zero> Zero for Wrapping<T> where Wrapping<T>: Add<Output=Wrapping<T>> {
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fn is_zero(&self) -> bool {
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self.0.is_zero()
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}
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fn zero() -> Self {
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Wrapping(T::zero())
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}
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}
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/// Defines a multiplicative identity element for `Self`.
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pub trait One: Sized + Mul<Self, Output = Self> {
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/// Returns the multiplicative identity element of `Self`, `1`.
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@ -94,6 +105,11 @@ one_impl!(i64, 1i64);
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one_impl!(f32, 1.0f32);
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one_impl!(f64, 1.0f64);
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impl<T: One> One for Wrapping<T> where Wrapping<T>: Mul<Output=Wrapping<T>> {
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fn one() -> Self {
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Wrapping(T::one())
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}
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}
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// Some helper functions provided for backwards compatibility.
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@ -15,6 +15,7 @@
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html_playground_url = "http://play.integer32.com/")]
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use std::ops::{Add, Sub, Mul, Div, Rem};
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use std::num::Wrapping;
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pub use bounds::Bounded;
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pub use float::{Float, FloatConst};
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@ -74,6 +75,18 @@ macro_rules! int_trait_impl {
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}
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int_trait_impl!(Num for usize u8 u16 u32 u64 isize i8 i16 i32 i64);
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impl<T: Num> Num for Wrapping<T>
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where Wrapping<T>:
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Add<Output = Wrapping<T>> + Sub<Output = Wrapping<T>>
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+ Mul<Output = Wrapping<T>> + Div<Output = Wrapping<T>> + Rem<Output = Wrapping<T>>
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{
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type FromStrRadixErr = T::FromStrRadixErr;
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fn from_str_radix(str: &str, radix: u32) -> Result<Self, Self::FromStrRadixErr> {
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T::from_str_radix(str, radix).map(Wrapping)
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}
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}
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#[derive(Debug)]
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pub enum FloatErrorKind {
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Empty,
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@ -243,9 +256,9 @@ float_trait_impl!(Num for f32 f64);
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/// A value bounded by a minimum and a maximum
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///
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/// If input is less than min then this returns min.
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/// If input is greater than max then this returns max.
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/// Otherwise this returns input.
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/// If input is less than min then this returns min.
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/// If input is greater than max then this returns max.
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/// Otherwise this returns input.
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#[inline]
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pub fn clamp<T: PartialOrd>(input: T, min: T, max: T) -> T {
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debug_assert!(min <= max, "min must be less than or equal to max");
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