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num-traits
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Run cargo fmt

This commit is contained in:
Josh Stone 2018-07-12 17:09:22 -07:00
parent 83841d15f8
commit d2bf4e04e4
14 changed files with 419 additions and 283 deletions
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27
src/bounds.rs
View File

@ -1,9 +1,9 @@
use core::{usize, u8, u16, u32, u64};
use core::{isize, i8, i16, i32, i64};
use core::{f32, f64};
use core::num::Wrapping;
use core::{f32, f64};
#[cfg(has_i128)]
use core::{i128, u128};
use core::{i16, i32, i64, i8, isize};
use core::{u16, u32, u64, u8, usize};
/// Numbers which have upper and lower bounds
pub trait Bounded {
@ -18,12 +18,16 @@ macro_rules! bounded_impl {
($t:ty, $min:expr, $max:expr) => {
impl Bounded for $t {
#[inline]
fn min_value() -> $t { $min }
fn min_value() -> $t {
$min
}
#[inline]
fn max_value() -> $t { $max }
fn max_value() -> $t {
$max
}
}
};
}
bounded_impl!(usize, usize::MIN, usize::MAX);
@ -43,8 +47,12 @@ bounded_impl!(i64, i64::MIN, i64::MAX);
bounded_impl!(i128, i128::MIN, i128::MAX);
impl<T: Bounded> Bounded for Wrapping<T> {
fn min_value() -> Self { Wrapping(T::min_value()) }
fn max_value() -> Self { Wrapping(T::max_value()) }
fn min_value() -> Self {
Wrapping(T::min_value())
}
fn max_value() -> Self {
Wrapping(T::max_value())
}
}
bounded_impl!(f32, f32::MIN, f32::MAX);
@ -59,9 +67,9 @@ macro_rules! for_each_tuple_ {
);
}
macro_rules! for_each_tuple {
( $m:ident ) => (
($m:ident) => {
for_each_tuple_! { $m !! A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, }
);
};
}
macro_rules! bounded_tuple {
@ -82,7 +90,6 @@ macro_rules! bounded_tuple {
for_each_tuple!(bounded_tuple);
bounded_impl!(f64, f64::MIN, f64::MAX);
#[test]
fn wrapping_bounded() {
macro_rules! test_wrapping_bounded {

129
src/cast.rs
View File

@ -1,10 +1,10 @@
use core::{i8, i16, i32, i64, isize};
use core::{u8, u16, u32, u64, usize};
use core::{f32, f64};
use core::mem::size_of;
use core::num::Wrapping;
use core::{f32, f64};
#[cfg(has_i128)]
use core::{i128, u128};
use core::{i16, i32, i64, i8, isize};
use core::{u16, u32, u64, u8, usize};
use float::FloatCore;
@ -137,7 +137,7 @@ macro_rules! impl_to_primitive_int_to_uint {
}
macro_rules! impl_to_primitive_int {
($T:ident) => (
($T:ident) => {
impl ToPrimitive for $T {
impl_to_primitive_int_to_int! { $T:
fn to_isize -> isize;
@ -160,11 +160,15 @@ macro_rules! impl_to_primitive_int {
}
#[inline]
fn to_f32(&self) -> Option<f32> { Some(*self as f32) }
#[inline]
fn to_f64(&self) -> Option<f64> { Some(*self as f64) }
fn to_f32(&self) -> Option<f32> {
Some(*self as f32)
}
)
#[inline]
fn to_f64(&self) -> Option<f64> {
Some(*self as f64)
}
}
};
}
impl_to_primitive_int!(isize);
@ -206,7 +210,7 @@ macro_rules! impl_to_primitive_uint_to_uint {
}
macro_rules! impl_to_primitive_uint {
($T:ident) => (
($T:ident) => {
impl ToPrimitive for $T {
impl_to_primitive_uint_to_int! { $T:
fn to_isize -> isize;
@ -229,11 +233,15 @@ macro_rules! impl_to_primitive_uint {
}
#[inline]
fn to_f32(&self) -> Option<f32> { Some(*self as f32) }
#[inline]
fn to_f64(&self) -> Option<f64> { Some(*self as f64) }
fn to_f32(&self) -> Option<f32> {
Some(*self as f32)
}
)
#[inline]
fn to_f64(&self) -> Option<f64> {
Some(*self as f64)
}
}
};
}
impl_to_primitive_uint!(usize);
@ -319,7 +327,7 @@ macro_rules! impl_to_primitive_float_to_unsigned_int {
}
macro_rules! impl_to_primitive_float {
($T:ident) => (
($T:ident) => {
impl ToPrimitive for $T {
impl_to_primitive_float_to_signed_int! { $T:
fn to_isize -> isize;
@ -346,7 +354,7 @@ macro_rules! impl_to_primitive_float {
fn to_f64 -> f64;
}
}
)
};
}
impl_to_primitive_float!(f32);
@ -463,29 +471,71 @@ pub trait FromPrimitive: Sized {
}
macro_rules! impl_from_primitive {
($T:ty, $to_ty:ident) => (
($T:ty, $to_ty:ident) => {
#[allow(deprecated)]
impl FromPrimitive for $T {
#[inline] fn from_isize(n: isize) -> Option<$T> { n.$to_ty() }
#[inline] fn from_i8(n: i8) -> Option<$T> { n.$to_ty() }
#[inline] fn from_i16(n: i16) -> Option<$T> { n.$to_ty() }
#[inline] fn from_i32(n: i32) -> Option<$T> { n.$to_ty() }
#[inline] fn from_i64(n: i64) -> Option<$T> { n.$to_ty() }
#[cfg(has_i128)]
#[inline] fn from_i128(n: i128) -> Option<$T> { n.$to_ty() }
#[inline] fn from_usize(n: usize) -> Option<$T> { n.$to_ty() }
#[inline] fn from_u8(n: u8) -> Option<$T> { n.$to_ty() }
#[inline] fn from_u16(n: u16) -> Option<$T> { n.$to_ty() }
#[inline] fn from_u32(n: u32) -> Option<$T> { n.$to_ty() }
#[inline] fn from_u64(n: u64) -> Option<$T> { n.$to_ty() }
#[cfg(has_i128)]
#[inline] fn from_u128(n: u128) -> Option<$T> { n.$to_ty() }
#[inline] fn from_f32(n: f32) -> Option<$T> { n.$to_ty() }
#[inline] fn from_f64(n: f64) -> Option<$T> { n.$to_ty() }
#[inline]
fn from_isize(n: isize) -> Option<$T> {
n.$to_ty()
}
)
#[inline]
fn from_i8(n: i8) -> Option<$T> {
n.$to_ty()
}
#[inline]
fn from_i16(n: i16) -> Option<$T> {
n.$to_ty()
}
#[inline]
fn from_i32(n: i32) -> Option<$T> {
n.$to_ty()
}
#[inline]
fn from_i64(n: i64) -> Option<$T> {
n.$to_ty()
}
#[cfg(has_i128)]
#[inline]
fn from_i128(n: i128) -> Option<$T> {
n.$to_ty()
}
#[inline]
fn from_usize(n: usize) -> Option<$T> {
n.$to_ty()
}
#[inline]
fn from_u8(n: u8) -> Option<$T> {
n.$to_ty()
}
#[inline]
fn from_u16(n: u16) -> Option<$T> {
n.$to_ty()
}
#[inline]
fn from_u32(n: u32) -> Option<$T> {
n.$to_ty()
}
#[inline]
fn from_u64(n: u64) -> Option<$T> {
n.$to_ty()
}
#[cfg(has_i128)]
#[inline]
fn from_u128(n: u128) -> Option<$T> {
n.$to_ty()
}
#[inline]
fn from_f32(n: f32) -> Option<$T> {
n.$to_ty()
}
#[inline]
fn from_f64(n: f64) -> Option<$T> {
n.$to_ty()
}
}
};
}
impl_from_primitive!(isize, to_isize);
@ -505,7 +555,6 @@ impl_from_primitive!(u128, to_u128);
impl_from_primitive!(f32, to_f32);
impl_from_primitive!(f64, to_f64);
macro_rules! impl_to_primitive_wrapping {
($( $(#[$cfg:meta])* fn $method:ident -> $i:ident ; )*) => {$(
#[inline]
@ -572,7 +621,6 @@ impl<T: FromPrimitive> FromPrimitive for Wrapping<T> {
}
}
/// Cast from one machine scalar to another.
///
/// # Examples
@ -596,7 +644,7 @@ pub trait NumCast: Sized + ToPrimitive {
}
macro_rules! impl_num_cast {
($T:ty, $conv:ident) => (
($T:ty, $conv:ident) => {
impl NumCast for $T {
#[inline]
#[allow(deprecated)]
@ -606,7 +654,7 @@ macro_rules! impl_num_cast {
n.$conv()
}
}
)
};
}
impl_num_cast!(u8, to_u8);
@ -669,7 +717,7 @@ impl<T: NumCast> NumCast for Wrapping<T> {
///
pub trait AsPrimitive<T>: 'static + Copy
where
T: 'static + Copy
T: 'static + Copy,
{
/// Convert a value to another, using the `as` operator.
fn as_(self) -> T;
@ -712,4 +760,3 @@ impl_as_primitive!(f32 => { f32, f64 });
impl_as_primitive!(f64 => { f32, f64 });
impl_as_primitive!(char => { char });
impl_as_primitive!(bool => {});

44
src/float.rs
View File

@ -1,6 +1,6 @@
use core::mem;
use core::ops::Neg;
use core::num::FpCategory;
use core::ops::Neg;
use core::f32;
use core::f64;
@ -586,7 +586,11 @@ pub trait FloatCore: Num + NumCast + Neg<Output = Self> + PartialOrd + Copy {
if other.is_nan() {
return self;
}
if self < other { self } else { other }
if self < other {
self
} else {
other
}
}
/// Returns the maximum of the two numbers.
@ -616,7 +620,11 @@ pub trait FloatCore: Num + NumCast + Neg<Output = Self> + PartialOrd + Copy {
if other.is_nan() {
return self;
}
if self > other { self } else { other }
if self > other {
self
} else {
other
}
}
/// Returns the reciprocal (multiplicative inverse) of the number.
@ -887,13 +895,7 @@ impl FloatCore for f64 {
///
/// This trait is only available with the `std` feature.
#[cfg(feature = "std")]
pub trait Float
: Num
+ Copy
+ NumCast
+ PartialOrd
+ Neg<Output = Self>
{
pub trait Float: Num + Copy + NumCast + PartialOrd + Neg<Output = Self> {
/// Returns the `NaN` value.
///
/// ```
@ -1777,7 +1779,6 @@ pub trait Float
/// ```
fn atanh(self) -> Self;
/// Returns the mantissa, base 2 exponent, and sign as integers, respectively.
/// The original number can be recovered by `sign * mantissa * 2 ^ exponent`.
///
@ -1802,7 +1803,7 @@ pub trait Float
#[cfg(feature = "std")]
macro_rules! float_impl {
($T:ident $decode:ident) => (
($T:ident $decode:ident) => {
impl Float for $T {
constant! {
nan() -> $T::NAN;
@ -1876,16 +1877,12 @@ macro_rules! float_impl {
Self::atanh(self) -> Self;
}
}
)
};
}
fn integer_decode_f32(f: f32) -> (u64, i16, i8) {
let bits: u32 = unsafe { mem::transmute(f) };
let sign: i8 = if bits >> 31 == 0 {
1
} else {
-1
};
let sign: i8 = if bits >> 31 == 0 { 1 } else { -1 };
let mut exponent: i16 = ((bits >> 23) & 0xff) as i16;
let mantissa = if exponent == 0 {
(bits & 0x7fffff) << 1
@ -1899,11 +1896,7 @@ fn integer_decode_f32(f: f32) -> (u64, i16, i8) {
fn integer_decode_f64(f: f64) -> (u64, i16, i8) {
let bits: u64 = unsafe { mem::transmute(f) };
let sign: i8 = if bits >> 63 == 0 {
1
} else {
-1
};
let sign: i8 = if bits >> 63 == 0 { 1 } else { -1 };
let mut exponent: i16 = ((bits >> 52) & 0x7ff) as i16;
let mantissa = if exponent == 0 {
(bits & 0xfffffffffffff) << 1
@ -2023,6 +2016,9 @@ mod tests {
fn to_degrees_rounding() {
use float::FloatCore;
assert_eq!(FloatCore::to_degrees(1_f32), 57.2957795130823208767981548141051703);
assert_eq!(
FloatCore::to_degrees(1_f32),
57.2957795130823208767981548141051703
);
}
}

41
src/identities.rs
View File

@ -1,5 +1,5 @@
use core::ops::{Add, Mul};
use core::num::Wrapping;
use core::ops::{Add, Mul};
/// Defines an additive identity element for `Self`.
pub trait Zero: Sized + Add<Self, Output = Self> {
@ -29,11 +29,15 @@ macro_rules! zero_impl {
($t:ty, $v:expr) => {
impl Zero for $t {
#[inline]
fn zero() -> $t { $v }
fn zero() -> $t {
$v
}
#[inline]
fn is_zero(&self) -> bool { *self == $v }
fn is_zero(&self) -> bool {
*self == $v
}
}
};
}
zero_impl!(usize, 0);
@ -55,7 +59,10 @@ zero_impl!(i128, 0);
zero_impl!(f32, 0.0);
zero_impl!(f64, 0.0);
impl<T: Zero> Zero for Wrapping<T> where Wrapping<T>: Add<Output=Wrapping<T>> {
impl<T: Zero> Zero for Wrapping<T>
where
Wrapping<T>: Add<Output = Wrapping<T>>,
{
fn is_zero(&self) -> bool {
self.0.is_zero()
}
@ -64,7 +71,6 @@ impl<T: Zero> Zero for Wrapping<T> where Wrapping<T>: Add<Output=Wrapping<T>> {
}
}
/// Defines a multiplicative identity element for `Self`.
pub trait One: Sized + Mul<Self, Output = Self> {
/// Returns the multiplicative identity element of `Self`, `1`.
@ -90,7 +96,10 @@ pub trait One: Sized + Mul<Self, Output = Self> {
/// After a semver bump, this method will be required, and the
/// `where Self: PartialEq` bound will be removed.
#[inline]
fn is_one(&self) -> bool where Self: PartialEq {
fn is_one(&self) -> bool
where
Self: PartialEq,
{
*self == Self::one()
}
}
@ -99,9 +108,11 @@ macro_rules! one_impl {
($t:ty, $v:expr) => {
impl One for $t {
#[inline]
fn one() -> $t { $v }
fn one() -> $t {
$v
}
}
};
}
one_impl!(usize, 1);
@ -123,7 +134,10 @@ one_impl!(i128, 1);
one_impl!(f32, 1.0);
one_impl!(f64, 1.0);
impl<T: One> One for Wrapping<T> where Wrapping<T>: Mul<Output=Wrapping<T>> {
impl<T: One> One for Wrapping<T>
where
Wrapping<T>: Mul<Output = Wrapping<T>>,
{
fn one() -> Self {
Wrapping(T::one())
}
@ -132,11 +146,16 @@ impl<T: One> One for Wrapping<T> where Wrapping<T>: Mul<Output=Wrapping<T>> {
// Some helper functions provided for backwards compatibility.
/// Returns the additive identity, `0`.
#[inline(always)] pub fn zero<T: Zero>() -> T { Zero::zero() }
#[inline(always)]
pub fn zero<T: Zero>() -> T {
Zero::zero()
}
/// Returns the multiplicative identity, `1`.
#[inline(always)] pub fn one<T: One>() -> T { One::one() }
#[inline(always)]
pub fn one<T: One>() -> T {
One::one()
}
#[test]
fn wrapping_identities() {

19
src/int.rs
View File

@ -1,16 +1,19 @@
use core::ops::{Not, BitAnd, BitOr, BitXor, Shl, Shr};
use core::ops::{BitAnd, BitOr, BitXor, Not, Shl, Shr};
use {Num, NumCast};
use bounds::Bounded;
use ops::checked::*;
use ops::saturating::Saturating;
use {Num, NumCast};
pub trait PrimInt
: Sized
pub trait PrimInt:
Sized
+ Copy
+ Num + NumCast
+ Num
+ NumCast
+ Bounded
+ PartialOrd + Ord + Eq
+ PartialOrd
+ Ord
+ Eq
+ Not<Output = Self>
+ BitAnd<Output = Self>
+ BitOr<Output = Self>
@ -278,7 +281,7 @@ pub trait PrimInt
}
macro_rules! prim_int_impl {
($T:ty, $S:ty, $U:ty) => (
($T:ty, $S:ty, $U:ty) => {
impl PrimInt for $T {
#[inline]
fn count_ones(self) -> u32 {
@ -360,7 +363,7 @@ macro_rules! prim_int_impl {
<$T>::pow(self, exp)
}
}
)
};
}
// prim_int_impl!(type, signed, unsigned);

117
src/lib.rs
View File

@ -15,53 +15,51 @@
//! The `num-traits` crate is tested for rustc 1.8 and greater.
#![doc(html_root_url = "https://docs.rs/num-traits/0.2")]
#![deny(unconditional_recursion)]
#![no_std]
#[cfg(feature = "std")]
extern crate std;
use core::ops::{Add, Sub, Mul, Div, Rem};
use core::ops::{AddAssign, SubAssign, MulAssign, DivAssign, RemAssign};
use core::num::Wrapping;
use core::fmt;
use core::num::Wrapping;
use core::ops::{Add, Div, Mul, Rem, Sub};
use core::ops::{AddAssign, DivAssign, MulAssign, RemAssign, SubAssign};
pub use bounds::Bounded;
#[cfg(feature = "std")]
pub use float::Float;
pub use float::FloatConst;
// pub use real::{FloatCore, Real}; // NOTE: Don't do this, it breaks `use num_traits::*;`.
pub use identities::{Zero, One, zero, one};
pub use cast::{cast, AsPrimitive, FromPrimitive, NumCast, ToPrimitive};
pub use identities::{one, zero, One, Zero};
pub use int::PrimInt;
pub use ops::checked::{
CheckedAdd, CheckedDiv, CheckedMul, CheckedNeg, CheckedRem, CheckedShl, CheckedShr, CheckedSub,
};
pub use ops::inv::Inv;
pub use ops::checked::{CheckedAdd, CheckedSub, CheckedMul, CheckedDiv,
CheckedRem, CheckedNeg, CheckedShl, CheckedShr};
pub use ops::wrapping::{WrappingAdd, WrappingMul, WrappingSub};
pub use ops::mul_add::{MulAdd, MulAddAssign};
pub use ops::saturating::Saturating;
pub use sign::{Signed, Unsigned, abs, abs_sub, signum};
pub use cast::{AsPrimitive, FromPrimitive, ToPrimitive, NumCast, cast};
pub use int::PrimInt;
pub use pow::{Pow, pow, checked_pow};
pub use ops::wrapping::{WrappingAdd, WrappingMul, WrappingSub};
pub use pow::{checked_pow, pow, Pow};
pub use sign::{abs, abs_sub, signum, Signed, Unsigned};
#[macro_use]
mod macros;
pub mod identities;
pub mod sign;
pub mod ops;
pub mod bounds;
pub mod cast;
pub mod float;
pub mod identities;
pub mod int;
pub mod ops;
pub mod pow;
#[cfg(feature = "std")]
pub mod real;
pub mod cast;
pub mod int;
pub mod pow;
pub mod sign;
/// The base trait for numeric types, covering `0` and `1` values,
/// comparisons, basic numeric operations, and string conversion.
pub trait Num: PartialEq + Zero + One + NumOps
{
pub trait Num: PartialEq + Zero + One + NumOps {
type FromStrRadixErr;
/// Convert from a string and radix <= 36.
@ -83,68 +81,81 @@ pub trait Num: PartialEq + Zero + One + NumOps
/// The trait for types implementing basic numeric operations
///
/// This is automatically implemented for types which implement the operators.
pub trait NumOps<Rhs = Self, Output = Self>
: Add<Rhs, Output = Output>
pub trait NumOps<Rhs = Self, Output = Self>:
Add<Rhs, Output = Output>
+ Sub<Rhs, Output = Output>
+ Mul<Rhs, Output = Output>
+ Div<Rhs, Output = Output>
+ Rem<Rhs, Output = Output>
{}
{
}
impl<T, Rhs, Output> NumOps<Rhs, Output> for T
where T: Add<Rhs, Output = Output>
where
T: Add<Rhs, Output = Output>
+ Sub<Rhs, Output = Output>
+ Mul<Rhs, Output = Output>
+ Div<Rhs, Output = Output>
+ Rem<Rhs, Output = Output>
{}
+ Rem<Rhs, Output = Output>,
{
}
/// The trait for `Num` types which also implement numeric operations taking
/// the second operand by reference.
///
/// This is automatically implemented for types which implement the operators.
pub trait NumRef: Num + for<'r> NumOps<&'r Self> {}
impl<T> NumRef for T where T: Num + for<'r> NumOps<&'r T> {}
impl<T> NumRef for T
where
T: Num + for<'r> NumOps<&'r T>,
{
}
/// The trait for references which implement numeric operations, taking the
/// second operand either by value or by reference.
///
/// This is automatically implemented for types which implement the operators.
pub trait RefNum<Base>: NumOps<Base, Base> + for<'r> NumOps<&'r Base, Base> {}
impl<T, Base> RefNum<Base> for T where T: NumOps<Base, Base> + for<'r> NumOps<&'r Base, Base> {}
impl<T, Base> RefNum<Base> for T
where
T: NumOps<Base, Base> + for<'r> NumOps<&'r Base, Base>,
{
}
/// The trait for types implementing numeric assignment operators (like `+=`).
///
/// This is automatically implemented for types which implement the operators.
pub trait NumAssignOps<Rhs = Self>
: AddAssign<Rhs>
+ SubAssign<Rhs>
+ MulAssign<Rhs>
+ DivAssign<Rhs>
+ RemAssign<Rhs>
{}
pub trait NumAssignOps<Rhs = Self>:
AddAssign<Rhs> + SubAssign<Rhs> + MulAssign<Rhs> + DivAssign<Rhs> + RemAssign<Rhs>
{
}
impl<T, Rhs> NumAssignOps<Rhs> for T
where T: AddAssign<Rhs>
+ SubAssign<Rhs>
+ MulAssign<Rhs>
+ DivAssign<Rhs>
+ RemAssign<Rhs>
{}
where
T: AddAssign<Rhs> + SubAssign<Rhs> + MulAssign<Rhs> + DivAssign<Rhs> + RemAssign<Rhs>,
{
}
/// The trait for `Num` types which also implement assignment operators.
///
/// This is automatically implemented for types which implement the operators.
pub trait NumAssign: Num + NumAssignOps {}
impl<T> NumAssign for T where T: Num + NumAssignOps {}
impl<T> NumAssign for T
where
T: Num + NumAssignOps,
{
}
/// The trait for `NumAssign` types which also implement assignment operations
/// taking the second operand by reference.
///
/// This is automatically implemented for types which implement the operators.
pub trait NumAssignRef: NumAssign + for<'r> NumAssignOps<&'r Self> {}
impl<T> NumAssignRef for T where T: NumAssign + for<'r> NumAssignOps<&'r T> {}
impl<T> NumAssignRef for T
where
T: NumAssign + for<'r> NumAssignOps<&'r T>,
{
}
macro_rules! int_trait_impl {
($name:ident for $($t:ty)*) => ($(
@ -164,9 +175,12 @@ int_trait_impl!(Num for usize u8 u16 u32 u64 isize i8 i16 i32 i64);
int_trait_impl!(Num for u128 i128);
impl<T: Num> Num for Wrapping<T>
where Wrapping<T>:
Add<Output = Wrapping<T>> + Sub<Output = Wrapping<T>>
+ Mul<Output = Wrapping<T>> + Div<Output = Wrapping<T>> + Rem<Output = Wrapping<T>>
where
Wrapping<T>: Add<Output = Wrapping<T>>
+ Sub<Output = Wrapping<T>>
+ Mul<Output = Wrapping<T>>
+ Div<Output = Wrapping<T>>
+ Rem<Output = Wrapping<T>>,
{
type FromStrRadixErr = T::FromStrRadixErr;
fn from_str_radix(str: &str, radix: u32) -> Result<Self, Self::FromStrRadixErr> {
@ -174,7 +188,6 @@ impl<T: Num> Num for Wrapping<T>
}
}
#[derive(Debug)]
pub enum FloatErrorKind {
Empty,
@ -442,7 +455,8 @@ fn check_numref_ops() {
#[test]
fn check_refnum_ops() {
fn compute<T: Copy>(x: &T, y: T) -> T
where for<'a> &'a T: RefNum<T>
where
for<'a> &'a T: RefNum<T>,
{
&(&(&(&(x * y) / y) % y) + y) - y
}
@ -452,7 +466,8 @@ fn check_refnum_ops() {
#[test]
fn check_refref_ops() {
fn compute<T>(x: &T, y: &T) -> T
where for<'a> &'a T: RefNum<T>
where
for<'a> &'a T: RefNum<T>,
{
&(&(&(&(x * y) / y) % y) + y) - y
}

8
src/ops/checked.rs
View File

@ -1,4 +1,4 @@
use core::ops::{Add, Sub, Mul, Div, Rem, Shl, Shr};
use core::ops::{Add, Div, Mul, Rem, Shl, Shr, Sub};
/// Performs addition that returns `None` instead of wrapping around on
/// overflow.
@ -16,7 +16,7 @@ macro_rules! checked_impl {
<$t>::$method(*self, *v)
}
}
}
};
}
checked_impl!(CheckedAdd, checked_add, u8);
@ -155,7 +155,7 @@ macro_rules! checked_impl_unary {
<$t>::$method(*self)
}
}
}
};
}
/// Performs negation that returns `None` if the result can't be represented.
@ -221,7 +221,7 @@ macro_rules! checked_shift_impl {
<$t>::$method(*self, rhs)
}
}
}
};
}
checked_shift_impl!(CheckedShl, checked_shl, u8);

16
src/ops/inv.rs
View File

@ -20,20 +20,28 @@ pub trait Inv {
impl Inv for f32 {
type Output = f32;
#[inline]
fn inv(self) -> f32 { 1.0 / self }
fn inv(self) -> f32 {
1.0 / self
}
}
impl Inv for f64 {
type Output = f64;
#[inline]
fn inv(self) -> f64 { 1.0 / self }
fn inv(self) -> f64 {
1.0 / self
}
}
impl<'a> Inv for &'a f32 {
type Output = f32;
#[inline]
fn inv(self) -> f32 { 1.0 / *self }
fn inv(self) -> f32 {
1.0 / *self
}
}
impl<'a> Inv for &'a f64 {
type Output = f64;
#[inline]
fn inv(self) -> f64 { 1.0 / *self }
fn inv(self) -> f64 {
1.0 / *self
}
}

4
src/ops/mod.rs
View File

@ -1,5 +1,5 @@
pub mod saturating;
pub mod checked;
pub mod wrapping;
pub mod inv;
pub mod mul_add;
pub mod saturating;
pub mod wrapping;

32
src/ops/wrapping.rs
View File

@ -1,5 +1,5 @@
use core::ops::{Add, Sub, Mul};
use core::num::Wrapping;
use core::ops::{Add, Mul, Sub};
macro_rules! wrapping_impl {
($trait_name:ident, $method:ident, $t:ty) => {
@ -17,7 +17,7 @@ macro_rules! wrapping_impl {
<$t>::$method(*self, *v)
}
}
}
};
}
/// Performs addition that wraps around on overflow.
@ -90,28 +90,42 @@ wrapping_impl!(WrappingMul, wrapping_mul, isize);
wrapping_impl!(WrappingMul, wrapping_mul, i128);
// Well this is a bit funny, but all the more appropriate.
impl<T: WrappingAdd> WrappingAdd for Wrapping<T> where Wrapping<T>: Add<Output = Wrapping<T>> {
impl<T: WrappingAdd> WrappingAdd for Wrapping<T>
where
Wrapping<T>: Add<Output = Wrapping<T>>,
{
fn wrapping_add(&self, v: &Self) -> Self {
Wrapping(self.0.wrapping_add(&v.0))
}
}
impl<T: WrappingSub> WrappingSub for Wrapping<T> where Wrapping<T>: Sub<Output = Wrapping<T>> {
impl<T: WrappingSub> WrappingSub for Wrapping<T>
where
Wrapping<T>: Sub<Output = Wrapping<T>>,
{
fn wrapping_sub(&self, v: &Self) -> Self {
Wrapping(self.0.wrapping_sub(&v.0))
}
}
impl<T: WrappingMul> WrappingMul for Wrapping<T> where Wrapping<T>: Mul<Output = Wrapping<T>> {
impl<T: WrappingMul> WrappingMul for Wrapping<T>
where
Wrapping<T>: Mul<Output = Wrapping<T>>,
{
fn wrapping_mul(&self, v: &Self) -> Self {
Wrapping(self.0.wrapping_mul(&v.0))
}
}
#[test]
fn test_wrapping_traits() {
fn wrapping_add<T: WrappingAdd>(a: T, b: T) -> T { a.wrapping_add(&b) }
fn wrapping_sub<T: WrappingSub>(a: T, b: T) -> T { a.wrapping_sub(&b) }
fn wrapping_mul<T: WrappingMul>(a: T, b: T) -> T { a.wrapping_mul(&b) }
fn wrapping_add<T: WrappingAdd>(a: T, b: T) -> T {
a.wrapping_add(&b)
}
fn wrapping_sub<T: WrappingSub>(a: T, b: T) -> T {
a.wrapping_sub(&b)
}
fn wrapping_mul<T: WrappingMul>(a: T, b: T) -> T {
a.wrapping_mul(&b)
}
assert_eq!(wrapping_add(255, 1), 0u8);
assert_eq!(wrapping_sub(0, 1), 255u8);
assert_eq!(wrapping_mul(255, 2), 254u8);

26
src/pow.rs
View File

@ -1,6 +1,6 @@
use core::ops::Mul;
use core::num::Wrapping;
use {One, CheckedMul};
use core::ops::Mul;
use {CheckedMul, One};
/// Binary operator for raising a value to a power.
pub trait Pow<RHS> {
@ -183,13 +183,17 @@ mod float_impls {
/// ```
#[inline]
pub fn pow<T: Clone + One + Mul<T, Output = T>>(mut base: T, mut exp: usize) -> T {
if exp == 0 { return T::one() }
if exp == 0 {
return T::one();
}
while exp & 1 == 0 {
base = base.clone() * base;
exp >>= 1;
}
if exp == 1 { return base }
if exp == 1 {
return base;
}
let mut acc = base.clone();
while exp > 1 {
@ -217,19 +221,27 @@ pub fn pow<T: Clone + One + Mul<T, Output = T>>(mut base: T, mut exp: usize) ->
/// ```
#[inline]
pub fn checked_pow<T: Clone + One + CheckedMul>(mut base: T, mut exp: usize) -> Option<T> {
if exp == 0 { return Some(T::one()) }
if exp == 0 {
return Some(T::one());
}
macro_rules! optry {
($expr:expr) => {
if let Some(val) = $expr { val } else { return None }
if let Some(val) = $expr {
val
} else {
return None;
}
};
}
while exp & 1 == 0 {
base = optry!(base.checked_mul(&base));
exp >>= 1;
}
if exp == 1 { return Some(base) }
if exp == 1 {
return Some(base);
}
let mut acc = base.clone();
while exp > 1 {

10
src/real.rs
View File

@ -1,6 +1,6 @@
use std::ops::Neg;
use {Num, NumCast, Float};
use {Float, Num, NumCast};
// NOTE: These doctests have the same issue as those in src/float.rs.
// They're testing the inherent methods directly, and not those of `Real`.
@ -12,13 +12,7 @@ use {Num, NumCast, Float};
/// for a list of data types that could meaningfully implement this trait.
///
/// This trait is only available with the `std` feature.
pub trait Real
: Num
+ Copy
+ NumCast
+ PartialOrd
+ Neg<Output = Self>
{
pub trait Real: Num + Copy + NumCast + PartialOrd + Neg<Output = Self> {
/// Returns the smallest finite value that this type can represent.
///
/// ```

41
src/sign.rs
View File

@ -1,8 +1,8 @@
use core::ops::Neg;
use core::num::Wrapping;
use core::ops::Neg;
use Num;
use float::FloatCore;
use Num;
/// Useful functions for signed numbers (i.e. numbers that can be negative).
pub trait Signed: Sized + Num + Neg<Output = Self> {
@ -77,7 +77,9 @@ signed_impl!(isize i8 i16 i32 i64);
#[cfg(has_i128)]
signed_impl!(i128);
impl<T: Signed> Signed for Wrapping<T> where Wrapping<T>: Num + Neg<Output=Wrapping<T>>
impl<T: Signed> Signed for Wrapping<T>
where
Wrapping<T>: Num + Neg<Output = Wrapping<T>>,
{
#[inline]
fn abs(&self) -> Self {
@ -95,10 +97,14 @@ impl<T: Signed> Signed for Wrapping<T> where Wrapping<T>: Num + Neg<Output=Wrapp
}
#[inline]
fn is_positive(&self) -> bool { self.0.is_positive() }
fn is_positive(&self) -> bool {
self.0.is_positive()
}
#[inline]
fn is_negative(&self) -> bool { self.0.is_negative() }
fn is_negative(&self) -> bool {
self.0.is_negative()
}
}
macro_rules! signed_float_impl {
@ -115,7 +121,11 @@ macro_rules! signed_float_impl {
/// and `other` is returned.
#[inline]
fn abs_sub(&self, other: &$t) -> $t {
if *self <= *other { 0. } else { *self - *other }
if *self <= *other {
0.
} else {
*self - *other
}
}
/// # Returns
@ -130,13 +140,17 @@ macro_rules! signed_float_impl {
/// Returns `true` if the number is positive, including `+0.0` and `INFINITY`
#[inline]
fn is_positive(&self) -> bool { FloatCore::is_sign_positive(*self) }
fn is_positive(&self) -> bool {
FloatCore::is_sign_positive(*self)
}
/// Returns `true` if the number is negative, including `-0.0` and `NEG_INFINITY`
#[inline]
fn is_negative(&self) -> bool { FloatCore::is_sign_negative(*self) }
fn is_negative(&self) -> bool {
FloatCore::is_sign_negative(*self)
}
}
};
}
signed_float_impl!(f32);
@ -174,7 +188,10 @@ pub fn abs_sub<T: Signed>(x: T, y: T) -> T {
/// * `0` if the number is zero
/// * `1` if the number is positive
/// * `-1` if the number is negative
#[inline(always)] pub fn signum<T: Signed>(value: T) -> T { value.signum() }
#[inline(always)]
pub fn signum<T: Signed>(value: T) -> T {
value.signum()
}
/// A trait for values which cannot be negative
pub trait Unsigned: Num {}
@ -189,7 +206,11 @@ empty_trait_impl!(Unsigned for usize u8 u16 u32 u64);
#[cfg(has_i128)]
empty_trait_impl!(Unsigned for u128);
impl<T: Unsigned> Unsigned for Wrapping<T> where Wrapping<T>: Num {}
impl<T: Unsigned> Unsigned for Wrapping<T>
where
Wrapping<T>: Num,
{
}
#[test]
fn unsigned_wrapping_is_unsigned() {

4
tests/cast.rs
View File

@ -11,11 +11,11 @@ extern crate num_traits;
use num_traits::cast::*;
use num_traits::Bounded;
use core::{i8, i16, i32, i64, isize};
use core::{u8, u16, u32, u64, usize};
use core::{f32, f64};
#[cfg(has_i128)]
use core::{i128, u128};
use core::{i16, i32, i64, i8, isize};
use core::{u16, u32, u64, u8, usize};
use core::fmt::Debug;
use core::mem;