nordic-dev.net/rust
nordic-dev.net/rust
2
0
Fork 0
mirror of https://github.com/rust-lang/rust.git synced 2024-12-15 18:15:01 +00:00
Code Issues Packages Projects Releases Wiki Activity

rollup merge of #23549: aturon/stab-num

Browse Source 
This commit stabilizes the `std::num` module:

* The `Int` and `Float` traits are deprecated in favor of (1) the
  newly-added inherent methods and (2) the generic traits available in
  rust-lang/num.

* The `Zero` and `One` traits are reintroduced in `std::num`, which
  together with various other traits allow you to recover the most
  common forms of generic programming.

* The `FromStrRadix` trait, and associated free function, is deprecated
  in favor of inherent implementations.

* A wide range of methods and constants for both integers and floating
  point numbers are now `#[stable]`, having been adjusted for integer
  guidelines.

* `is_positive` and `is_negative` are renamed to `is_sign_positive` and
  `is_sign_negative`, in order to address #22985

* The `Wrapping` type is moved to `std::num` and stabilized;
  `WrappingOps` is deprecated in favor of inherent methods on the
  integer types, and direct implementation of operations on
  `Wrapping<X>` for each concrete integer type `X`.

Closes #22985
Closes #21069

[breaking-change]

r? @alexcrichton
This commit is contained in:
Alex Crichton 2015-03-31 10:15:26 -07:00
commit 5d0beb7d85
48 changed files with 997 additions and 1263 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
src/liballoc/heap.rs
View File

@ -189,7 +189,6 @@ mod imp {
use core::option::Option;
use core::option::Option::None;
use core::ptr::{null_mut, null};
use core::num::Int;
use libc::{c_char, c_int, c_void, size_t};
use super::MIN_ALIGN;

1
src/libcollections/bit.rs
View File

@ -91,7 +91,6 @@ use core::hash;
use core::iter::RandomAccessIterator;
use core::iter::{Chain, Enumerate, Repeat, Skip, Take, repeat, Cloned};
use core::iter::{self, FromIterator, IntoIterator};
use core::num::Int;
use core::ops::Index;
use core::slice;
use core::{u8, u32, usize};

1
src/libcollections/enum_set.rs
View File

@ -16,7 +16,6 @@
use core::prelude::*;
use core::marker;
use core::fmt;
use core::num::Int;
use core::iter::{FromIterator, IntoIterator};
use core::ops::{Sub, BitOr, BitAnd, BitXor};

1
src/libcollections/slice.rs
View File

@ -89,6 +89,7 @@ use core::iter::MultiplicativeIterator;
use core::marker::Sized;
use core::mem::size_of;
use core::mem;
#[cfg(stage0)]
use core::num::wrapping::WrappingOps;
use core::ops::FnMut;
use core::option::Option::{self, Some, None};

3
src/libcollections/str.rs
View File

@ -18,9 +18,6 @@
//! (see below). It is not possible to move out of borrowed strings because they
//! are owned elsewhere.
//!
//! Basic operations are implemented directly by the compiler, but more advanced
//! operations are defined as methods on the `str` type.
//!
//! # Examples
//!
//! Here's some code that uses a `&str`:

1
src/libcollections/vec_deque.rs
View File

@ -25,6 +25,7 @@ use core::default::Default;
use core::fmt;
use core::iter::{self, repeat, FromIterator, IntoIterator, RandomAccessIterator};
use core::mem;
#[cfg(stage0)]
use core::num::wrapping::WrappingOps;
use core::ops::{Index, IndexMut};
use core::ptr::{self, Unique};

2
src/libcore/cmp.rs
View File

@ -20,8 +20,6 @@
//!
//! ```
//! # #![feature(core)]
//! use std::num::SignedInt;
//!
//! struct FuzzyNum {
//! num: i32,
//! }

1
src/libcore/fmt/num.rs
View File

@ -33,6 +33,7 @@ trait GenericRadix {
fn digit(&self, x: u8) -> u8;
/// Format an integer using the radix using a formatter.
#[allow(deprecated)] // Int
fn fmt_int<T: Int>(&self, mut x: T, f: &mut fmt::Formatter) -> fmt::Result {
// The radix can be as low as 2, so we need a buffer of at least 64
// characters for a base 2 number.

5
src/libcore/hash/sip.rs
View File

@ -12,9 +12,10 @@
//! An implementation of SipHash 2-4.
#![allow(deprecated)] // until the next snapshot for inherent wrapping ops
use prelude::*;
use default::Default;
use num::wrapping::WrappingOps;
use super::Hasher;
/// An implementation of SipHash 2-4.
@ -71,7 +72,7 @@ macro_rules! u8to64_le {
macro_rules! rotl {
($x:expr, $b:expr) =>
(($x << $b) | ($x >> (64.wrapping_sub($b))))
(($x << $b) | ($x >> (64_i32.wrapping_sub($b))))
}
macro_rules! compress {

158
src/libcore/iter.rs
View File

@ -64,8 +64,8 @@ use cmp::Ord;
use default::Default;
use marker;
use mem;
use num::{ToPrimitive, Int};
use ops::{Add, FnMut, RangeFrom};
use num::{Int, Zero, One, ToPrimitive};
use ops::{Add, Sub, FnMut, RangeFrom};
use option::Option;
use option::Option::{Some, None};
use marker::Sized;
@ -843,9 +843,8 @@ pub trait Iterator {
///
/// ```
/// # #![feature(core)]
/// use std::num::SignedInt;
///
/// let a = [-3, 0, 1, 5, -10];
/// let a = [-3_i32, 0, 1, 5, -10];
/// assert_eq!(*a.iter().max_by(|x| x.abs()).unwrap(), -10);
/// ```
#[inline]
@ -875,9 +874,8 @@ pub trait Iterator {
///
/// ```
/// # #![feature(core)]
/// use std::num::SignedInt;
///
/// let a = [-3, 0, 1, 5, -10];
/// let a = [-3_i32, 0, 1, 5, -10];
/// assert_eq!(*a.iter().min_by(|x| x.abs()).unwrap(), 0);
/// ```
#[inline]
@ -2417,6 +2415,67 @@ impl<A, St, F> Iterator for Unfold<St, F> where F: FnMut(&mut St) -> Option<A> {
}
}
/// Objects that can be stepped over in both directions.
///
/// The `steps_between` function provides a way to efficiently compare
/// two `Step` objects.
#[unstable(feature = "step_trait",
reason = "likely to be replaced by finer-grained traits")]
pub trait Step: Ord {
/// Steps `self` if possible.
fn step(&self, by: &Self) -> Option<Self>;
/// The number of steps between two step objects.
///
/// `start` should always be less than `end`, so the result should never
/// be negative.
///
/// Return `None` if it is not possible to calculate steps_between
/// without overflow.
fn steps_between(start: &Self, end: &Self, by: &Self) -> Option<usize>;
}
macro_rules! step_impl {
($($t:ty)*) => ($(
impl Step for $t {
#[inline]
fn step(&self, by: &$t) -> Option<$t> {
(*self).checked_add(*by)
}
#[inline]
#[allow(trivial_numeric_casts)]
fn steps_between(start: &$t, end: &$t, by: &$t) -> Option<usize> {
if *start <= *end {
Some(((*end - *start) / *by) as usize)
} else {
Some(0)
}
}
}
)*)
}
macro_rules! step_impl_no_between {
($($t:ty)*) => ($(
impl Step for $t {
#[inline]
fn step(&self, by: &$t) -> Option<$t> {
(*self).checked_add(*by)
}
#[inline]
fn steps_between(_a: &$t, _b: &$t, _by: &$t) -> Option<usize> {
None
}
}
)*)
}
step_impl!(usize u8 u16 u32 isize i8 i16 i32);
#[cfg(target_pointer_width = "64")]
step_impl!(u64 i64);
#[cfg(target_pointer_width = "32")]
step_impl_no_between!(u64 i64);
/// An adapter for stepping range iterators by a custom amount.
///
/// The resulting iterator handles overflow by stopping. The `A`
@ -2429,7 +2488,7 @@ pub struct StepBy<A, R> {
range: R,
}
impl<A: Add> RangeFrom<A> {
impl<A: Step> RangeFrom<A> {
/// Creates an iterator starting at the same point, but stepping by
/// the given amount at each iteration.
///
@ -2451,7 +2510,8 @@ impl<A: Add> RangeFrom<A> {
}
}
impl<A: Int> ::ops::Range<A> {
#[allow(deprecated)]
impl<A: Step> ::ops::Range<A> {
/// Creates an iterator with the same range, but stepping by the
/// given amount at each iteration.
///
@ -2505,14 +2565,17 @@ pub fn count<A>(start: A, step: A) -> Counter<A> {
}
#[stable(feature = "rust1", since = "1.0.0")]
impl<A: Add<Output=A> + Clone> Iterator for StepBy<A, RangeFrom<A>> {
impl<A> Iterator for StepBy<A, RangeFrom<A>> where
A: Clone,
for<'a> &'a A: Add<&'a A, Output = A>
{
type Item = A;
#[inline]
fn next(&mut self) -> Option<A> {
let result = self.range.start.clone();
self.range.start = result.clone() + self.step_by.clone();
Some(result)
let mut n = &self.range.start + &self.step_by;
mem::swap(&mut n, &mut self.range.start);
Some(n)
}
#[inline]
@ -2715,19 +2778,27 @@ pub fn range_step<A: Int>(start: A, stop: A, step: A) -> RangeStep<A> {
}
#[stable(feature = "rust1", since = "1.0.0")]
impl<A: Int> Iterator for StepBy<A, ::ops::Range<A>> {
#[allow(deprecated)]
impl<A: Step + Zero + Clone> Iterator for StepBy<A, ::ops::Range<A>> {
type Item = A;
#[inline]
fn next(&mut self) -> Option<A> {
let rev = self.step_by < Int::zero();
let start = self.range.start;
if (rev && start > self.range.end) || (!rev && start < self.range.end) {
match start.checked_add(self.step_by) {
Some(x) => self.range.start = x,
None => self.range.start = self.range.end.clone()
let rev = self.step_by < A::zero();
if (rev && self.range.start > self.range.end) ||
(!rev && self.range.start < self.range.end)
{
match self.range.start.step(&self.step_by) {
Some(mut n) => {
mem::swap(&mut self.range.start, &mut n);
Some(n)
},
None => {
let mut n = self.range.end.clone();
mem::swap(&mut self.range.start, &mut n);
Some(n)
}
}
Some(start)
} else {
None
}
@ -2774,6 +2845,7 @@ pub struct RangeStepInclusive<A> {
#[inline]
#[unstable(feature = "core",
reason = "likely to be replaced by range notation and adapters")]
#[allow(deprecated)]
pub fn range_step_inclusive<A: Int>(start: A, stop: A, step: A) -> RangeStepInclusive<A> {
let rev = step < Int::zero();
RangeStepInclusive {
@ -2787,6 +2859,7 @@ pub fn range_step_inclusive<A: Int>(start: A, stop: A, step: A) -> RangeStepIncl
#[unstable(feature = "core",
reason = "likely to be replaced by range notation and adapters")]
#[allow(deprecated)]
impl<A: Int> Iterator for RangeStepInclusive<A> {
type Item = A;
@ -2814,15 +2887,25 @@ macro_rules! range_exact_iter_impl {
}
#[stable(feature = "rust1", since = "1.0.0")]
impl<A: Int> Iterator for ::ops::Range<A> {
#[allow(deprecated)]
impl<A: Step + One + Clone> Iterator for ::ops::Range<A> {
type Item = A;
#[inline]
fn next(&mut self) -> Option<A> {
if self.start < self.end {
let result = self.start;
self.start = self.start + Int::one();
Some(result)
match self.start.step(&A::one()) {
Some(mut n) => {
mem::swap(&mut n, &mut self.start);
Some(n)
},
None => {
let mut n = self.end.clone();
mem::swap(&mut n, &mut self.start);
Some(n)
}
}
} else {
None
}
@ -2830,11 +2913,10 @@ impl<A: Int> Iterator for ::ops::Range<A> {
#[inline]
fn size_hint(&self) -> (usize, Option<usize>) {
if self.start >= self.end {
(0, Some(0))
if let Some(hint) = Step::steps_between(&self.start, &self.end, &A::one()) {
(hint, Some(hint))
} else {
let length = (self.end - self.start).to_usize();
(length.unwrap_or(0), length)
(0, None)
}
}
}
@ -2844,12 +2926,15 @@ impl<A: Int> Iterator for ::ops::Range<A> {
range_exact_iter_impl!(usize u8 u16 u32 isize i8 i16 i32);
#[stable(feature = "rust1", since = "1.0.0")]
impl<A: Int> DoubleEndedIterator for ::ops::Range<A> {
#[allow(deprecated)]
impl<A: Step + One + Clone> DoubleEndedIterator for ::ops::Range<A> where
for<'a> &'a A: Sub<&'a A, Output = A>
{
#[inline]
fn next_back(&mut self) -> Option<A> {
if self.start < self.end {
self.end = self.end - Int::one();
Some(self.end)
self.end = &self.end - &A::one();
Some(self.end.clone())
} else {
None
}
@ -2857,15 +2942,16 @@ impl<A: Int> DoubleEndedIterator for ::ops::Range<A> {
}
#[stable(feature = "rust1", since = "1.0.0")]
impl<A: Int> Iterator for ::ops::RangeFrom<A> {
#[allow(deprecated)]
impl<A: Step + One> Iterator for ::ops::RangeFrom<A> {
type Item = A;
#[inline]
fn next(&mut self) -> Option<A> {
let result = self.start;
self.start = self.start + Int::one();
debug_assert!(result < self.start);
Some(result)
self.start.step(&A::one()).map(|mut n| {
mem::swap(&mut n, &mut self.start);
n
})
}
}

48
src/libcore/num/f32.rs
View File

@ -22,12 +22,12 @@ use num::Float;
use num::FpCategory as Fp;
use option::Option;
#[unstable(feature = "core", reason = "pending integer conventions")]
#[stable(feature = "rust1", since = "1.0.0")]
pub const RADIX: u32 = 2;
#[unstable(feature = "core", reason = "pending integer conventions")]
#[stable(feature = "rust1", since = "1.0.0")]
pub const MANTISSA_DIGITS: u32 = 24;
#[unstable(feature = "core", reason = "pending integer conventions")]
#[stable(feature = "rust1", since = "1.0.0")]
pub const DIGITS: u32 = 6;
#[stable(feature = "rust1", since = "1.0.0")]
@ -56,14 +56,14 @@ pub const MIN_POSITIVE: f32 = 1.17549435e-38_f32;
#[stable(feature = "rust1", since = "1.0.0")]
pub const MAX: f32 = 3.40282347e+38_f32;
#[unstable(feature = "core", reason = "pending integer conventions")]
#[stable(feature = "rust1", since = "1.0.0")]
pub const MIN_EXP: i32 = -125;
#[unstable(feature = "core", reason = "pending integer conventions")]
#[stable(feature = "rust1", since = "1.0.0")]
pub const MAX_EXP: i32 = 128;
#[unstable(feature = "core", reason = "pending integer conventions")]
#[stable(feature = "rust1", since = "1.0.0")]
pub const MIN_10_EXP: i32 = -37;
#[unstable(feature = "core", reason = "pending integer conventions")]
#[stable(feature = "rust1", since = "1.0.0")]
pub const MAX_10_EXP: i32 = 38;
#[stable(feature = "rust1", since = "1.0.0")]
@ -73,61 +73,89 @@ pub const INFINITY: f32 = 1.0_f32/0.0_f32;
#[stable(feature = "rust1", since = "1.0.0")]
pub const NEG_INFINITY: f32 = -1.0_f32/0.0_f32;
/// Various useful constants.
#[unstable(feature = "core",
reason = "naming scheme needs to be revisited")]
/// Basic mathematial constants.
#[stable(feature = "rust1", since = "1.0.0")]
pub mod consts {
// FIXME: replace with mathematical constants from cmath.
/// Archimedes' constant
#[stable(feature = "rust1", since = "1.0.0")]
pub const PI: f32 = 3.14159265358979323846264338327950288_f32;
/// pi * 2.0
#[unstable(feature = "core", reason = "unclear naming convention/usefulness")]
pub const PI_2: f32 = 6.28318530717958647692528676655900576_f32;
/// pi/2.0
#[stable(feature = "rust1", since = "1.0.0")]
pub const FRAC_PI_2: f32 = 1.57079632679489661923132169163975144_f32;
/// pi/3.0
#[stable(feature = "rust1", since = "1.0.0")]
pub const FRAC_PI_3: f32 = 1.04719755119659774615421446109316763_f32;
/// pi/4.0
#[stable(feature = "rust1", since = "1.0.0")]
pub const FRAC_PI_4: f32 = 0.785398163397448309615660845819875721_f32;
/// pi/6.0
#[stable(feature = "rust1", since = "1.0.0")]
pub const FRAC_PI_6: f32 = 0.52359877559829887307710723054658381_f32;
/// pi/8.0
#[stable(feature = "rust1", since = "1.0.0")]
pub const FRAC_PI_8: f32 = 0.39269908169872415480783042290993786_f32;
/// 1.0/pi
#[stable(feature = "rust1", since = "1.0.0")]
pub const FRAC_1_PI: f32 = 0.318309886183790671537767526745028724_f32;
/// 2.0/pi
#[stable(feature = "rust1", since = "1.0.0")]
pub const FRAC_2_PI: f32 = 0.636619772367581343075535053490057448_f32;
/// 2.0/sqrt(pi)
#[stable(feature = "rust1", since = "1.0.0")]
pub const FRAC_2_SQRT_PI: f32 = 1.12837916709551257389615890312154517_f32;
#[stable(feature = "rust1", since = "1.0.0")]
#[deprecated(since = "1.0.0", reason = "renamed to FRAC_2_SQRT_PI")]
pub const FRAC_2_SQRTPI: f32 = 1.12837916709551257389615890312154517_f32;
/// sqrt(2.0)
#[stable(feature = "rust1", since = "1.0.0")]
pub const SQRT_2: f32 = 1.41421356237309504880168872420969808_f32;
#[stable(feature = "rust1", since = "1.0.0")]
#[deprecated(since = "1.0.0", reason = "renamed to SQRT_2")]
pub const SQRT2: f32 = 1.41421356237309504880168872420969808_f32;
/// 1.0/sqrt(2.0)
#[stable(feature = "rust1", since = "1.0.0")]
pub const FRAC_1_SQRT_2: f32 = 0.707106781186547524400844362104849039_f32;
#[stable(feature = "rust1", since = "1.0.0")]
#[deprecated(since = "1.0.0", reason = "renamed to FRAC_1_SQRT_2")]
pub const FRAC_1_SQRT2: f32 = 0.707106781186547524400844362104849039_f32;
/// Euler's number
#[stable(feature = "rust1", since = "1.0.0")]
pub const E: f32 = 2.71828182845904523536028747135266250_f32;
/// log2(e)
#[stable(feature = "rust1", since = "1.0.0")]
pub const LOG2_E: f32 = 1.44269504088896340735992468100189214_f32;
/// log10(e)
#[stable(feature = "rust1", since = "1.0.0")]
pub const LOG10_E: f32 = 0.434294481903251827651128918916605082_f32;
/// ln(2.0)
#[stable(feature = "rust1", since = "1.0.0")]
pub const LN_2: f32 = 0.693147180559945309417232121458176568_f32;
/// ln(10.0)
#[stable(feature = "rust1", since = "1.0.0")]
pub const LN_10: f32 = 2.30258509299404568401799145468436421_f32;
}

55
src/libcore/num/f64.rs
View File

@ -22,15 +22,12 @@ use num::Float;
use num::FpCategory as Fp;
use option::Option;
// FIXME(#5527): These constants should be deprecated once associated
// constants are implemented in favour of referencing the respective
// members of `Bounded` and `Float`.
#[unstable(feature = "core", reason = "pending integer conventions")]
#[stable(feature = "rust1", since = "1.0.0")]
pub const RADIX: u32 = 2;
#[stable(feature = "rust1", since = "1.0.0")]
pub const MANTISSA_DIGITS: u32 = 53;
#[unstable(feature = "core", reason = "pending integer conventions")]
#[stable(feature = "rust1", since = "1.0.0")]
pub const DIGITS: u32 = 15;
#[stable(feature = "rust1", since = "1.0.0")]
@ -59,14 +56,14 @@ pub const MIN_POSITIVE: f64 = 2.2250738585072014e-308_f64;
#[stable(feature = "rust1", since = "1.0.0")]
pub const MAX: f64 = 1.7976931348623157e+308_f64;
#[unstable(feature = "core", reason = "pending integer conventions")]
#[stable(feature = "rust1", since = "1.0.0")]
pub const MIN_EXP: i32 = -1021;
#[unstable(feature = "core", reason = "pending integer conventions")]
#[stable(feature = "rust1", since = "1.0.0")]
pub const MAX_EXP: i32 = 1024;
#[unstable(feature = "core", reason = "pending integer conventions")]
#[stable(feature = "rust1", since = "1.0.0")]
pub const MIN_10_EXP: i32 = -307;
#[unstable(feature = "core", reason = "pending integer conventions")]
#[stable(feature = "rust1", since = "1.0.0")]
pub const MAX_10_EXP: i32 = 308;
#[stable(feature = "rust1", since = "1.0.0")]
@ -76,65 +73,89 @@ pub const INFINITY: f64 = 1.0_f64/0.0_f64;
#[stable(feature = "rust1", since = "1.0.0")]
pub const NEG_INFINITY: f64 = -1.0_f64/0.0_f64;
/// Various useful constants.
#[unstable(feature = "core",
reason = "naming scheme needs to be revisited")]
/// Basic mathematial constants.
#[stable(feature = "rust1", since = "1.0.0")]
pub mod consts {
// FIXME: replace with mathematical constants from cmath.
// FIXME(#5527): These constants should be deprecated once associated
// constants are implemented in favour of referencing the respective members
// of `Float`.
/// Archimedes' constant
#[stable(feature = "rust1", since = "1.0.0")]
pub const PI: f64 = 3.14159265358979323846264338327950288_f64;
/// pi * 2.0
#[unstable(feature = "core", reason = "unclear naming convention/usefulness")]
pub const PI_2: f64 = 6.28318530717958647692528676655900576_f64;
/// pi/2.0
#[stable(feature = "rust1", since = "1.0.0")]
pub const FRAC_PI_2: f64 = 1.57079632679489661923132169163975144_f64;
/// pi/3.0
#[stable(feature = "rust1", since = "1.0.0")]
pub const FRAC_PI_3: f64 = 1.04719755119659774615421446109316763_f64;
/// pi/4.0
#[stable(feature = "rust1", since = "1.0.0")]
pub const FRAC_PI_4: f64 = 0.785398163397448309615660845819875721_f64;
/// pi/6.0
#[stable(feature = "rust1", since = "1.0.0")]
pub const FRAC_PI_6: f64 = 0.52359877559829887307710723054658381_f64;
/// pi/8.0
#[stable(feature = "rust1", since = "1.0.0")]
pub const FRAC_PI_8: f64 = 0.39269908169872415480783042290993786_f64;
/// 1.0/pi
#[stable(feature = "rust1", since = "1.0.0")]
pub const FRAC_1_PI: f64 = 0.318309886183790671537767526745028724_f64;
/// 2.0/pi
#[stable(feature = "rust1", since = "1.0.0")]
pub const FRAC_2_PI: f64 = 0.636619772367581343075535053490057448_f64;
/// 2.0/sqrt(pi)
#[stable(feature = "rust1", since = "1.0.0")]
pub const FRAC_2_SQRT_PI: f64 = 1.12837916709551257389615890312154517_f64;
#[stable(feature = "rust1", since = "1.0.0")]
#[deprecated(since = "1.0.0", reason = "renamed to FRAC_2_SQRT_PI")]
pub const FRAC_2_SQRTPI: f64 = 1.12837916709551257389615890312154517_f64;
/// sqrt(2.0)
#[stable(feature = "rust1", since = "1.0.0")]
pub const SQRT_2: f64 = 1.41421356237309504880168872420969808_f64;
#[stable(feature = "rust1", since = "1.0.0")]
#[deprecated(since = "1.0.0", reason = "renamed to SQRT_2")]
pub const SQRT2: f64 = 1.41421356237309504880168872420969808_f64;
/// 1.0/sqrt(2.0)
#[stable(feature = "rust1", since = "1.0.0")]
pub const FRAC_1_SQRT_2: f64 = 0.707106781186547524400844362104849039_f64;
#[stable(feature = "rust1", since = "1.0.0")]
#[deprecated(since = "1.0.0", reason = "renamed to FRAC_1_SQRT_2")]
pub const FRAC_1_SQRT2: f64 = 0.707106781186547524400844362104849039_f64;
/// Euler's number
#[stable(feature = "rust1", since = "1.0.0")]
pub const E: f64 = 2.71828182845904523536028747135266250_f64;
/// log2(e)
#[stable(feature = "rust1", since = "1.0.0")]
pub const LOG2_E: f64 = 1.44269504088896340735992468100189214_f64;
/// log10(e)
#[stable(feature = "rust1", since = "1.0.0")]
pub const LOG10_E: f64 = 0.434294481903251827651128918916605082_f64;
/// ln(2.0)
#[stable(feature = "rust1", since = "1.0.0")]
pub const LN_2: f64 = 0.693147180559945309417232121458176568_f64;
/// ln(10.0)
#[stable(feature = "rust1", since = "1.0.0")]
pub const LN_10: f64 = 2.30258509299404568401799145468436421_f64;
}

305
src/libcore/num/mod.rs
View File

@ -32,11 +32,66 @@ use option::Option::{self, Some, None};
use result::Result::{self, Ok, Err};
use str::{FromStr, StrExt};
/// Provides intentionally-wrapped arithmetic on `T`.
///
/// Operations like `+` on `u32` values is intended to never overflow,
/// and in some debug configurations overflow is detected and results
/// in a panic. While most arithmetic falls into this category, some
/// code explicitly expects and relies upon modular arithmetic (e.g.,
/// hashing).
///
/// Wrapping arithmetic can be achieved either through methods like
/// `wrapping_add`, or through the `Wrapping<T>` type, which says that
/// all standard arithmetic operations on the underlying value are
/// intended to have wrapping semantics.
#[stable(feature = "rust1", since = "1.0.0")]
#[derive(PartialEq, Eq, PartialOrd, Ord, Clone, Copy, Debug)]
pub struct Wrapping<T>(pub T);
#[unstable(feature = "core", reason = "may be removed or relocated")]
pub mod wrapping;
/// Types that have a "zero" value.
///
/// This trait is intended for use in conjunction with `Add`, as an identity:
/// `x + T::zero() == x`.
#[unstable(feature = "zero_one",
reason = "unsure of placement, wants to use associated constants")]
pub trait Zero {
/// The "zero" (usually, additive identity) for this type.
fn zero() -> Self;
}
/// Types that have a "one" value.
///
/// This trait is intended for use in conjunction with `Mul`, as an identity:
/// `x * T::one() == x`.
#[unstable(feature = "zero_one",
reason = "unsure of placement, wants to use associated constants")]
pub trait One {
/// The "one" (usually, multiplicative identity) for this type.
fn one() -> Self;
}
macro_rules! zero_one_impl {
($($t:ty)*) => ($(
impl Zero for $t {
#[inline]
fn zero() -> $t { 0 }
}
impl One for $t {
#[inline]
fn one() -> $t { 1 }
}
)*)
}
zero_one_impl! { u8 u16 u32 u64 usize i8 i16 i32 i64 isize }
/// A built-in signed or unsigned integer.
#[stable(feature = "rust1", since = "1.0.0")]
#[deprecated(since = "1.0.0",
reason = "replaced by inherent methods; for generics, use rust-lang/num")]
#[allow(deprecated)]
pub trait Int
: Copy + Clone
+ NumCast
@ -450,6 +505,7 @@ macro_rules! uint_impl {
$sub_with_overflow:path,
$mul_with_overflow:path) => {
#[stable(feature = "rust1", since = "1.0.0")]
#[allow(deprecated)]
impl Int for $T {
#[inline]
fn zero() -> $T { 0 }
@ -589,6 +645,7 @@ macro_rules! int_impl {
$sub_with_overflow:path,
$mul_with_overflow:path) => {
#[stable(feature = "rust1", since = "1.0.0")]
#[allow(deprecated)]
impl Int for $T {
#[inline]
fn zero() -> $T { 0 }
@ -692,6 +749,9 @@ int_impl! { isize = i64, u64, 64,
/// A built-in two's complement integer.
#[stable(feature = "rust1", since = "1.0.0")]
#[deprecated(since = "1.0.0",
reason = "replaced by inherent methods; for generics, use rust-lang/num")]
#[allow(deprecated)]
pub trait SignedInt
: Int
+ Neg<Output=Self>
@ -723,6 +783,7 @@ pub trait SignedInt
macro_rules! signed_int_impl {
($T:ty) => {
#[stable(feature = "rust1", since = "1.0.0")]
#[allow(deprecated)]
impl SignedInt for $T {
#[inline]
fn abs(self) -> $T {
@ -759,35 +820,25 @@ macro_rules! int_impl {
$add_with_overflow:path,
$sub_with_overflow:path,
$mul_with_overflow:path) => {
/// Returns the `0` value of this integer type.
// FIXME (#5527): Should be an associated constant
#[unstable(feature = "core",
reason = "unsure about its place in the world")]
#[inline]
pub fn zero() -> $T { 0 }
/// Returns the `1` value of this integer type.
// FIXME (#5527): Should be an associated constant
#[unstable(feature = "core",
reason = "unsure about its place in the world")]
#[inline]
pub fn one() -> $T { 1 }
/// Returns the smallest value that can be represented by this integer
/// type.
// FIXME (#5527): Should be and associated constant
#[unstable(feature = "core",
reason = "unsure about its place in the world")]
#[inline]
pub fn min_value() -> $T { (-1 as $T) << ($BITS - 1) }
/// Returns the largest value that can be represented by this integer
/// type.
// FIXME (#5527): Should be and associated constant
#[unstable(feature = "core",
reason = "unsure about its place in the world")]
#[inline]
pub fn max_value() -> $T { let min: $T = <$T>::min_value(); !min }
/// Convert a string slice in a given base to an integer.
///
/// Leading and trailing whitespace represent an error.
///
/// # Arguments
///
/// * src - A string slice
/// * radix - The base to use. Must lie in the range [2 .. 36]
///
/// # Return value
///
/// `None` if the string did not represent a valid number.
/// Otherwise, `Some(n)` where `n` is the integer represented
/// by `src`.
#[stable(feature = "rust1", since = "1.0.0")]
#[allow(deprecated)]
pub fn from_str_radix(src: &str, radix: u32) -> Result<$T, ParseIntError> {
<Self as FromStrRadix>::from_str_radix(src, radix)
}
/// Returns the number of ones in the binary representation of `self`.
///
@ -801,8 +852,7 @@ macro_rules! int_impl {
///
/// assert_eq!(n.count_ones(), 3);
/// ```
#[unstable(feature = "core",
reason = "pending integer conventions")]
#[stable(feature = "rust1", since = "1.0.0")]
#[inline]
pub fn count_ones(self) -> u32 { (self as $UnsignedT).count_ones() }
@ -818,8 +868,7 @@ macro_rules! int_impl {
///
/// assert_eq!(n.count_zeros(), 5);
/// ```
#[unstable(feature = "core",
reason = "pending integer conventions")]
#[stable(feature = "rust1", since = "1.0.0")]
#[inline]
pub fn count_zeros(self) -> u32 {
(!self).count_ones()
@ -838,8 +887,7 @@ macro_rules! int_impl {
///
/// assert_eq!(n.leading_zeros(), 10);
/// ```
#[unstable(feature = "core",
reason = "pending integer conventions")]
#[stable(feature = "rust1", since = "1.0.0")]
#[inline]
pub fn leading_zeros(self) -> u32 {
(self as $UnsignedT).leading_zeros()
@ -858,8 +906,7 @@ macro_rules! int_impl {
///
/// assert_eq!(n.trailing_zeros(), 3);
/// ```
#[unstable(feature = "core",
reason = "pending integer conventions")]
#[stable(feature = "rust1", since = "1.0.0")]
#[inline]
pub fn trailing_zeros(self) -> u32 {
(self as $UnsignedT).trailing_zeros()
@ -879,8 +926,7 @@ macro_rules! int_impl {
///
/// assert_eq!(n.rotate_left(12), m);
/// ```
#[unstable(feature = "core",
reason = "pending integer conventions")]
#[stable(feature = "rust1", since = "1.0.0")]
#[inline]
pub fn rotate_left(self, n: u32) -> $T {
(self as $UnsignedT).rotate_left(n) as $T
@ -901,8 +947,7 @@ macro_rules! int_impl {
///
/// assert_eq!(n.rotate_right(12), m);
/// ```
#[unstable(feature = "core",
reason = "pending integer conventions")]
#[stable(feature = "rust1", since = "1.0.0")]
#[inline]
pub fn rotate_right(self, n: u32) -> $T {
(self as $UnsignedT).rotate_right(n) as $T
@ -1103,7 +1148,7 @@ macro_rules! int_impl {
pub fn saturating_add(self, other: $T) -> $T {
match self.checked_add(other) {
Some(x) => x,
None if other >= <$T>::zero() => <$T>::max_value(),
None if other >= <$T as Zero>::zero() => <$T>::max_value(),
None => <$T>::min_value(),
}
}
@ -1115,11 +1160,41 @@ macro_rules! int_impl {
pub fn saturating_sub(self, other: $T) -> $T {
match self.checked_sub(other) {
Some(x) => x,
None if other >= <$T>::zero() => <$T>::min_value(),
None if other >= <$T as Zero>::zero() => <$T>::min_value(),
None => <$T>::max_value(),
}
}
/// Wrapping (modular) addition. Computes `self + other`,
/// wrapping around at the boundary of the type.
#[stable(feature = "rust1", since = "1.0.0")]
#[inline]
pub fn wrapping_add(self, rhs: $T) -> $T {
unsafe {
intrinsics::overflowing_add(self, rhs)
}
}
/// Wrapping (modular) subtraction. Computes `self - other`,
/// wrapping around at the boundary of the type.
#[stable(feature = "rust1", since = "1.0.0")]
#[inline]
pub fn wrapping_sub(self, rhs: $T) -> $T {
unsafe {
intrinsics::overflowing_sub(self, rhs)
}
}
/// Wrapping (modular) multiplication. Computes `self *
/// other`, wrapping around at the boundary of the type.
#[stable(feature = "rust1", since = "1.0.0")]
#[inline]
pub fn wrapping_mul(self, rhs: $T) -> $T {
unsafe {
intrinsics::overflowing_mul(self, rhs)
}
}
/// Raises self to the power of `exp`, using exponentiation by squaring.
///
/// # Examples
@ -1130,12 +1205,11 @@ macro_rules! int_impl {
///
/// assert_eq!(2.pow(4), 16);
/// ```
#[unstable(feature = "core",
reason = "pending integer conventions")]
#[stable(feature = "rust1", since = "1.0.0")]
#[inline]
pub fn pow(self, mut exp: u32) -> $T {
let mut base = self;
let mut acc = <$T>::one();
let mut acc = <$T as One>::one();
let mut prev_base = self;
let mut base_oflo = false;
@ -1161,7 +1235,7 @@ macro_rules! int_impl {
/// Computes the absolute value of `self`. `Int::min_value()` will be
/// returned if the number is `Int::min_value()`.
#[unstable(feature = "core", reason = "overflow in debug builds?")]
#[stable(feature = "rust1", since = "1.0.0")]
#[inline]
pub fn abs(self) -> $T {
if self.is_negative() { -self } else { self }
@ -1256,35 +1330,25 @@ macro_rules! uint_impl {
$add_with_overflow:path,
$sub_with_overflow:path,
$mul_with_overflow:path) => {
/// Returns the `0` value of this integer type.
// FIXME (#5527): Should be an associated constant
#[unstable(feature = "core",
reason = "unsure about its place in the world")]
#[inline]
pub fn zero() -> $T { 0 }
/// Returns the `1` value of this integer type.
// FIXME (#5527): Should be an associated constant
#[unstable(feature = "core",
reason = "unsure about its place in the world")]
#[inline]
pub fn one() -> $T { 1 }
/// Returns the smallest value that can be represented by this integer
/// type.
// FIXME (#5527): Should be and associated constant
#[unstable(feature = "core",
reason = "unsure about its place in the world")]
#[inline]
pub fn min_value() -> $T { 0 }
/// Returns the largest value that can be represented by this integer
/// type.
// FIXME (#5527): Should be and associated constant
#[unstable(feature = "core",
reason = "unsure about its place in the world")]
#[inline]
pub fn max_value() -> $T { -1 }
/// Convert a string slice in a given base to an integer.
///
/// Leading and trailing whitespace represent an error.
///
/// # Arguments
///
/// * src - A string slice
/// * radix - The base to use. Must lie in the range [2 .. 36]
///
/// # Return value
///
/// `None` if the string did not represent a valid number.
/// Otherwise, `Some(n)` where `n` is the integer represented
/// by `src`.
#[stable(feature = "rust1", since = "1.0.0")]
#[allow(deprecated)]
pub fn from_str_radix(src: &str, radix: u32) -> Result<$T, ParseIntError> {
<Self as FromStrRadix>::from_str_radix(src, radix)
}
/// Returns the number of ones in the binary representation of `self`.
///
@ -1298,8 +1362,7 @@ macro_rules! uint_impl {
///
/// assert_eq!(n.count_ones(), 3);
/// ```
#[unstable(feature = "core",
reason = "pending integer conventions")]
#[stable(feature = "rust1", since = "1.0.0")]
#[inline]
pub fn count_ones(self) -> u32 {
unsafe { $ctpop(self as $ActualT) as u32 }
@ -1317,8 +1380,7 @@ macro_rules! uint_impl {
///
/// assert_eq!(n.count_zeros(), 5);
/// ```
#[unstable(feature = "core",
reason = "pending integer conventions")]
#[stable(feature = "rust1", since = "1.0.0")]
#[inline]
pub fn count_zeros(self) -> u32 {
(!self).count_ones()
@ -1337,8 +1399,7 @@ macro_rules! uint_impl {
///
/// assert_eq!(n.leading_zeros(), 10);
/// ```
#[unstable(feature = "core",
reason = "pending integer conventions")]
#[stable(feature = "rust1", since = "1.0.0")]
#[inline]
pub fn leading_zeros(self) -> u32 {
unsafe { $ctlz(self as $ActualT) as u32 }
@ -1357,8 +1418,7 @@ macro_rules! uint_impl {
///
/// assert_eq!(n.trailing_zeros(), 3);
/// ```
#[unstable(feature = "core",
reason = "pending integer conventions")]
#[stable(feature = "rust1", since = "1.0.0")]
#[inline]
pub fn trailing_zeros(self) -> u32 {
unsafe { $cttz(self as $ActualT) as u32 }
@ -1378,8 +1438,7 @@ macro_rules! uint_impl {
///
/// assert_eq!(n.rotate_left(12), m);
/// ```
#[unstable(feature = "core",
reason = "pending integer conventions")]
#[stable(feature = "rust1", since = "1.0.0")]
#[inline]
pub fn rotate_left(self, n: u32) -> $T {
// Protect against undefined behaviour for over-long bit shifts
@ -1402,8 +1461,7 @@ macro_rules! uint_impl {
///
/// assert_eq!(n.rotate_right(12), m);
/// ```
#[unstable(feature = "core",
reason = "pending integer conventions")]
#[stable(feature = "rust1", since = "1.0.0")]
#[inline]
pub fn rotate_right(self, n: u32) -> $T {
// Protect against undefined behaviour for over-long bit shifts
@ -1604,7 +1662,7 @@ macro_rules! uint_impl {
pub fn saturating_add(self, other: $T) -> $T {
match self.checked_add(other) {
Some(x) => x,
None if other >= <$T>::zero() => <$T>::max_value(),
None if other >= <$T as Zero>::zero() => <$T>::max_value(),
None => <$T>::min_value(),
}
}
@ -1616,11 +1674,41 @@ macro_rules! uint_impl {
pub fn saturating_sub(self, other: $T) -> $T {
match self.checked_sub(other) {
Some(x) => x,
None if other >= <$T>::zero() => <$T>::min_value(),
None if other >= <$T as Zero>::zero() => <$T>::min_value(),
None => <$T>::max_value(),
}
}
/// Wrapping (modular) addition. Computes `self + other`,
/// wrapping around at the boundary of the type.
#[stable(feature = "rust1", since = "1.0.0")]
#[inline]
pub fn wrapping_add(self, rhs: $T) -> $T {
unsafe {
intrinsics::overflowing_add(self, rhs)
}
}
/// Wrapping (modular) subtraction. Computes `self - other`,
/// wrapping around at the boundary of the type.
#[stable(feature = "rust1", since = "1.0.0")]
#[inline]
pub fn wrapping_sub(self, rhs: $T) -> $T {
unsafe {
intrinsics::overflowing_sub(self, rhs)
}
}
/// Wrapping (modular) multiplication. Computes `self *
/// other`, wrapping around at the boundary of the type.
#[stable(feature = "rust1", since = "1.0.0")]
#[inline]
pub fn wrapping_mul(self, rhs: $T) -> $T {
unsafe {
intrinsics::overflowing_mul(self, rhs)
}
}
/// Raises self to the power of `exp`, using exponentiation by squaring.
///
/// # Examples
@ -1631,12 +1719,11 @@ macro_rules! uint_impl {
///
/// assert_eq!(2.pow(4), 16);
/// ```
#[unstable(feature = "core",
reason = "pending integer conventions")]
#[stable(feature = "rust1", since = "1.0.0")]
#[inline]
pub fn pow(self, mut exp: u32) -> $T {
let mut base = self;
let mut acc = <$T>::one();
let mut acc = <$T as One>::one();
let mut prev_base = self;
let mut base_oflo = false;
@ -1664,8 +1751,8 @@ macro_rules! uint_impl {
#[stable(feature = "rust1", since = "1.0.0")]
#[inline]
pub fn is_power_of_two(self) -> bool {
(self.wrapping_sub(<$T>::one())) & self == <$T>::zero() &&
!(self == <$T>::zero())
(self.wrapping_sub(<$T as One>::one())) & self == <$T as Zero>::zero() &&
!(self == <$T as Zero>::zero())
}
/// Returns the smallest power of two greater than or equal to `self`.
@ -1674,7 +1761,7 @@ macro_rules! uint_impl {
#[inline]
pub fn next_power_of_two(self) -> $T {
let bits = size_of::<$T>() * 8;
let one: $T = <$T>::one();
let one: $T = <$T as One>::one();
one << ((bits - self.wrapping_sub(one).leading_zeros() as usize) % bits)
}
@ -2339,17 +2426,26 @@ impl_num_cast! { f64, to_f64 }
/// Used for representing the classification of floating point numbers
#[derive(Copy, PartialEq, Debug)]
#[unstable(feature = "core", reason = "may be renamed")]
#[stable(feature = "rust1", since = "1.0.0")]
pub enum FpCategory {
/// "Not a Number", often obtained by dividing by zero
#[stable(feature = "rust1", since = "1.0.0")]
Nan,
/// Positive or negative infinity
#[stable(feature = "rust1", since = "1.0.0")]
Infinite ,
/// Positive or negative zero
#[stable(feature = "rust1", since = "1.0.0")]
Zero,
/// De-normalized floating point representation (less precise than `Normal`)
#[stable(feature = "rust1", since = "1.0.0")]
Subnormal,
/// A regular floating point number
#[stable(feature = "rust1", since = "1.0.0")]
Normal,
}
@ -2526,13 +2622,24 @@ pub trait Float
/// A generic trait for converting a string with a radix (base) to a value
#[unstable(feature = "core", reason = "needs reevaluation")]
#[deprecated(since = "1.0.0",
reason = "moved to inherent methods; use e.g. i32::from_str_radix")]
pub trait FromStrRadix {
#[unstable(feature = "core", reason = "needs reevaluation")]
#[deprecated(since = "1.0.0", reason = "moved to inherent methods")]
type Err;
#[unstable(feature = "core", reason = "needs reevaluation")]
#[deprecated(since = "1.0.0",
reason = "moved to inherent methods; use e.g. i32::from_str_radix")]
#[allow(deprecated)]
fn from_str_radix(str: &str, radix: u32) -> Result<Self, Self::Err>;
}
/// A utility function that just calls `FromStrRadix::from_str_radix`.
#[unstable(feature = "core", reason = "needs reevaluation")]
#[deprecated(since = "1.0.0", reason = "use e.g. i32::from_str_radix")]
#[allow(deprecated)]
pub fn from_str_radix<T: FromStrRadix>(str: &str, radix: u32)
-> Result<T, T::Err> {
FromStrRadix::from_str_radix(str, radix)
@ -2570,12 +2677,14 @@ macro_rules! from_str_radix_float_impl {
/// `None` if the string did not represent a valid number. Otherwise,
/// `Some(n)` where `n` is the floating-point number represented by `src`.
#[inline]
#[allow(deprecated)]
fn from_str(src: &str) -> Result<$T, ParseFloatError> {
from_str_radix(src, 10)
}
}
#[stable(feature = "rust1", since = "1.0.0")]
#[allow(deprecated)]
impl FromStrRadix for $T {
type Err = ParseFloatError;
@ -2746,6 +2855,7 @@ from_str_radix_float_impl! { f64 }
macro_rules! from_str_radix_int_impl {
($T:ty) => {
#[stable(feature = "rust1", since = "1.0.0")]
#[allow(deprecated)]
impl FromStr for $T {
type Err = ParseIntError;
#[inline]
@ -2755,6 +2865,7 @@ macro_rules! from_str_radix_int_impl {
}
#[stable(feature = "rust1", since = "1.0.0")]
#[allow(deprecated)]
impl FromStrRadix for $T {
type Err = ParseIntError;
fn from_str_radix(src: &str, radix: u32)

202
src/libcore/num/wrapping.rs
View File

@ -7,7 +7,11 @@
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
#![allow(missing_docs)]
#![allow(deprecated)]
use super::Wrapping;
use ops::*;
@ -26,6 +30,8 @@ use intrinsics::{i16_mul_with_overflow, u16_mul_with_overflow};
use intrinsics::{i32_mul_with_overflow, u32_mul_with_overflow};
use intrinsics::{i64_mul_with_overflow, u64_mul_with_overflow};
#[unstable(feature = "core", reason = "may be removed, renamed, or relocated")]
#[deprecated(since = "1.0.0", reason = "moved to inherent methods")]
pub trait WrappingOps {
fn wrapping_add(self, rhs: Self) -> Self;
fn wrapping_sub(self, rhs: Self) -> Self;
@ -39,6 +45,49 @@ pub trait OverflowingOps {
fn overflowing_mul(self, rhs: Self) -> (Self, bool);
}
macro_rules! sh_impl {
($t:ty, $f:ty) => (
#[stable(feature = "rust1", since = "1.0.0")]
impl Shl<$f> for Wrapping<$t> {
type Output = Wrapping<$t>;
#[inline(always)]
fn shl(self, other: $f) -> Wrapping<$t> {
Wrapping(self.0 << other)
}
}
#[stable(feature = "rust1", since = "1.0.0")]
impl Shr<$f> for Wrapping<$t> {
type Output = Wrapping<$t>;
#[inline(always)]
fn shr(self, other: $f) -> Wrapping<$t> {
Wrapping(self.0 >> other)
}
}
)
}
// FIXME (#23545): uncomment the remaining impls
macro_rules! sh_impl_all {
($($t:ty)*) => ($(
// sh_impl! { $t, u8 }
// sh_impl! { $t, u16 }
// sh_impl! { $t, u32 }
// sh_impl! { $t, u64 }
sh_impl! { $t, usize }
// sh_impl! { $t, i8 }
// sh_impl! { $t, i16 }
// sh_impl! { $t, i32 }
// sh_impl! { $t, i64 }
// sh_impl! { $t, isize }
)*)
}
sh_impl_all! { u8 u16 u32 u64 usize i8 i16 i32 i64 isize }
macro_rules! wrapping_impl {
($($t:ty)*) => ($(
impl WrappingOps for $t {
@ -61,95 +110,80 @@ macro_rules! wrapping_impl {
}
}
}
#[stable(feature = "rust1", since = "1.0.0")]
impl Add for Wrapping<$t> {
type Output = Wrapping<$t>;
#[inline(always)]
fn add(self, other: Wrapping<$t>) -> Wrapping<$t> {
Wrapping(self.0.wrapping_add(other.0))
}
}
#[stable(feature = "rust1", since = "1.0.0")]
impl Sub for Wrapping<$t> {
type Output = Wrapping<$t>;
#[inline(always)]
fn sub(self, other: Wrapping<$t>) -> Wrapping<$t> {
Wrapping(self.0.wrapping_sub(other.0))
}
}
#[stable(feature = "rust1", since = "1.0.0")]
impl Mul for Wrapping<$t> {
type Output = Wrapping<$t>;
#[inline(always)]
fn mul(self, other: Wrapping<$t>) -> Wrapping<$t> {
Wrapping(self.0.wrapping_mul(other.0))
}
}
#[stable(feature = "rust1", since = "1.0.0")]
impl Not for Wrapping<$t> {
type Output = Wrapping<$t>;
fn not(self) -> Wrapping<$t> {
Wrapping(!self.0)
}
}
#[stable(feature = "rust1", since = "1.0.0")]
impl BitXor for Wrapping<$t> {
type Output = Wrapping<$t>;
#[inline(always)]
fn bitxor(self, other: Wrapping<$t>) -> Wrapping<$t> {
Wrapping(self.0 ^ other.0)
}
}
#[stable(feature = "rust1", since = "1.0.0")]
impl BitOr for Wrapping<$t> {
type Output = Wrapping<$t>;
#[inline(always)]
fn bitor(self, other: Wrapping<$t>) -> Wrapping<$t> {
Wrapping(self.0 | other.0)
}
}
#[stable(feature = "rust1", since = "1.0.0")]
impl BitAnd for Wrapping<$t> {
type Output = Wrapping<$t>;
#[inline(always)]
fn bitand(self, other: Wrapping<$t>) -> Wrapping<$t> {
Wrapping(self.0 & other.0)
}
}
)*)
}
wrapping_impl! { usize u8 u16 u32 u64 isize i8 i16 i32 i64 }
#[unstable(feature = "core", reason = "may be removed, renamed, or relocated")]
#[derive(PartialEq, Eq, PartialOrd, Ord, Debug, Clone, Copy)]
pub struct Wrapping<T>(pub T);
impl<T:WrappingOps> Add for Wrapping<T> {
type Output = Wrapping<T>;
#[inline(always)]
fn add(self, other: Wrapping<T>) -> Wrapping<T> {
Wrapping(self.0.wrapping_add(other.0))
}
}
impl<T:WrappingOps> Sub for Wrapping<T> {
type Output = Wrapping<T>;
#[inline(always)]
fn sub(self, other: Wrapping<T>) -> Wrapping<T> {
Wrapping(self.0.wrapping_sub(other.0))
}
}
impl<T:WrappingOps> Mul for Wrapping<T> {
type Output = Wrapping<T>;
#[inline(always)]
fn mul(self, other: Wrapping<T>) -> Wrapping<T> {
Wrapping(self.0.wrapping_mul(other.0))
}
}
impl<T:WrappingOps+Not<Output=T>> Not for Wrapping<T> {
type Output = Wrapping<T>;
fn not(self) -> Wrapping<T> {
Wrapping(!self.0)
}
}
impl<T:WrappingOps+BitXor<Output=T>> BitXor for Wrapping<T> {
type Output = Wrapping<T>;
#[inline(always)]
fn bitxor(self, other: Wrapping<T>) -> Wrapping<T> {
Wrapping(self.0 ^ other.0)
}
}
impl<T:WrappingOps+BitOr<Output=T>> BitOr for Wrapping<T> {
type Output = Wrapping<T>;
#[inline(always)]
fn bitor(self, other: Wrapping<T>) -> Wrapping<T> {
Wrapping(self.0 | other.0)
}
}
impl<T:WrappingOps+BitAnd<Output=T>> BitAnd for Wrapping<T> {
type Output = Wrapping<T>;
#[inline(always)]
fn bitand(self, other: Wrapping<T>) -> Wrapping<T> {
Wrapping(self.0 & other.0)
}
}
impl<T:WrappingOps+Shl<usize,Output=T>> Shl<usize> for Wrapping<T> {
type Output = Wrapping<T>;
#[inline(always)]
fn shl(self, other: usize) -> Wrapping<T> {
Wrapping(self.0 << other)
}
}
impl<T:WrappingOps+Shr<usize,Output=T>> Shr<usize> for Wrapping<T> {
type Output = Wrapping<T>;
#[inline(always)]
fn shr(self, other: usize) -> Wrapping<T> {
Wrapping(self.0 >> other)
}
}
macro_rules! overflowing_impl {
($($t:ident)*) => ($(
impl OverflowingOps for $t {

4
src/libcore/str/mod.rs
View File

@ -945,9 +945,9 @@ impl TwoWaySearcher {
// critical factorization (u, v) and p = period(v)
#[inline]
#[allow(dead_code)]
#[allow(deprecated)]
fn maximal_suffix(arr: &[u8], reversed: bool) -> (usize, usize) {
use num::wrapping::WrappingOps;
let mut left = -1; // Corresponds to i in the paper
let mut left: usize = -1; // Corresponds to i in the paper
let mut right = 0; // Corresponds to j in the paper
let mut offset = 1; // Corresponds to k in the paper
let mut period = 1; // Corresponds to p in the paper

12
src/librand/isaac.rs
View File

@ -14,8 +14,8 @@
use core::prelude::*;
use core::slice;
use core::iter::{range_step, repeat};
use core::num::wrapping::Wrapping as w;
use core::iter::repeat;
use core::num::Wrapping as w;
use {Rng, SeedableRng, Rand};
@ -95,7 +95,7 @@ impl IsaacRng {
if use_rsl {
macro_rules! memloop {
($arr:expr) => {{
for i in range_step(0, RAND_SIZE_USIZE, 8) {
for i in (0..RAND_SIZE_USIZE).step_by(8) {
a=a+$arr[i ]; b=b+$arr[i+1];
c=c+$arr[i+2]; d=d+$arr[i+3];
e=e+$arr[i+4]; f=f+$arr[i+5];
@ -112,7 +112,7 @@ impl IsaacRng {
memloop!(self.rsl);
memloop!(self.mem);
} else {
for i in range_step(0, RAND_SIZE_USIZE, 8) {
for i in (0..RAND_SIZE_USIZE).step_by(8) {
mix!();
self.mem[i ]=a; self.mem[i+1]=b;
self.mem[i+2]=c; self.mem[i+3]=d;
@ -136,7 +136,7 @@ impl IsaacRng {
const MIDPOINT: usize = RAND_SIZE_USIZE / 2;
macro_rules! ind {
($x:expr) => ( self.mem[($x >> 2).0 as usize & (RAND_SIZE_USIZE - 1)] )
($x:expr) => (self.mem[($x >> 2).0 as usize & (RAND_SIZE_USIZE - 1)] )
}
let r = [(0, MIDPOINT), (MIDPOINT, 0)];
@ -172,7 +172,7 @@ impl IsaacRng {
}}
}
for i in range_step(0, MIDPOINT, 4) {
for i in (0..MIDPOINT).step_by(4) {
rngstepp!(i + 0, 13);
rngstepn!(i + 1, 6);
rngstepp!(i + 2, 2);

1
src/librand/lib.rs
View File

@ -30,6 +30,7 @@
#![feature(staged_api)]
#![staged_api]
#![feature(core)]
#![feature(step_by)]
#![deprecated(reason = "use the crates.io `rand` library instead",
since = "1.0.0-alpha")]

4
src/librbml/lib.rs
View File

@ -241,7 +241,6 @@ pub mod reader {
use std::isize;
use std::mem::transmute;
use std::num::Int;
use std::slice::bytes;
use serialize;
@ -346,7 +345,7 @@ pub mod reader {
unsafe {
let ptr = data.as_ptr().offset(start as isize) as *const u32;
let val = Int::from_be(*ptr);
let val = u32::from_be(*ptr);
let i = (val >> 28) as usize;
let (shift, mask) = SHIFT_MASK_TABLE[i];
@ -835,7 +834,6 @@ pub mod reader {
pub mod writer {
use std::mem;
use std::num::Int;
use std::io::prelude::*;
use std::io::{self, SeekFrom, Cursor};
use std::slice::bytes;

2
src/librustc/metadata/decoder.rs
View File

@ -35,7 +35,7 @@ use std::collections::HashMap;
use std::hash::{self, Hash, SipHasher};
use std::io::prelude::*;
use std::io;
use std::num::{FromPrimitive, Int};
use std::num::FromPrimitive;
use std::rc::Rc;
use std::slice::bytes;
use std::str;

1
src/librustc/middle/ty.rs
View File

@ -5491,7 +5491,6 @@ pub fn type_is_empty(cx: &ctxt, ty: Ty) -> bool {
pub fn enum_variants<'tcx>(cx: &ctxt<'tcx>, id: ast::DefId)
-> Rc<Vec<Rc<VariantInfo<'tcx>>>> {
use std::num::Int; // For checked_add
memoized(&cx.enum_var_cache, id, |id: ast::DefId| {
if ast::LOCAL_CRATE != id.krate {
Rc::new(csearch::get_enum_variants(cx, id))

6
src/librustc_back/sha2.rs
View File

@ -64,7 +64,7 @@ impl ToBits for u64 {
fn add_bytes_to_bits<T: Int + ToBits>(bits: T, bytes: T) -> T {
let (new_high_bits, new_low_bits) = bytes.to_bits();
if new_high_bits > Int::zero() {
if new_high_bits > T::zero() {
panic!("numeric overflow occurred.")
}
@ -537,7 +537,7 @@ mod tests {
use self::rand::isaac::IsaacRng;
use serialize::hex::FromHex;
use std::iter::repeat;
use std::num::Int;
use std::u64;
use super::{Digest, Sha256, FixedBuffer};
// A normal addition - no overflow occurs
@ -550,7 +550,7 @@ mod tests {
#[test]
#[should_panic]
fn test_add_bytes_to_bits_overflow() {
super::add_bytes_to_bits::<u64>(Int::max_value(), 1);
super::add_bytes_to_bits::<u64>(u64::MAX, 1);
}
struct Test {

1
src/librustc_lint/builtin.rs
View File

@ -41,7 +41,6 @@ use lint::{Level, Context, LintPass, LintArray, Lint};
use std::collections::{HashSet, BitSet};
use std::collections::hash_map::Entry::{Occupied, Vacant};
use std::num::SignedInt;
use std::{cmp, slice};
use std::{i8, i16, i32, i64, u8, u16, u32, u64, f32, f64};

2
src/librustc_trans/back/lto.rs
View File

@ -22,6 +22,7 @@ use flate;
use std::ffi::CString;
use std::mem;
#[allow(deprecated)]
use std::num::Int;
pub fn run(sess: &session::Session, llmod: ModuleRef,
@ -204,6 +205,7 @@ fn extract_compressed_bytecode_size_v1(bc: &[u8]) -> u64 {
return read_from_le_bytes::<u64>(bc, link::RLIB_BYTECODE_OBJECT_V1_DATASIZE_OFFSET);
}
#[allow(deprecated)]
fn read_from_le_bytes<T: Int>(bytes: &[u8], position_in_bytes: usize) -> T {
let byte_data = &bytes[position_in_bytes..position_in_bytes + mem::size_of::<T>()];
let data = unsafe {

1
src/librustc_trans/trans/adt.rs
View File

@ -45,6 +45,7 @@
pub use self::Repr::*;
#[allow(deprecated)]
use std::num::Int;
use std::rc::Rc;

1
src/librustc_trans/trans/type_of.rs
View File

@ -21,6 +21,7 @@ use util::ppaux::Repr;
use trans::type_::Type;
#[allow(deprecated)]
use std::num::Int;
use syntax::abi;
use syntax::ast;

2
src/librustc_typeck/check/mod.rs
View File

@ -4285,7 +4285,7 @@ pub fn check_enum_variants<'a,'tcx>(ccx: &CrateCtxt<'a,'tcx>,
id: ast::NodeId,
hint: attr::ReprAttr)
-> Vec<Rc<ty::VariantInfo<'tcx>>> {
use std::num::Int;
#![allow(trivial_numeric_casts)]
let rty = ty::node_id_to_type(ccx.tcx, id);
let mut variants: Vec<Rc<ty::VariantInfo>> = Vec::new();

3
src/libserialize/json.rs
View File

@ -204,6 +204,8 @@ use std::io::prelude::*;
use std::io;
use std::mem::swap;
use std::num::FpCategory as Fp;
#[allow(deprecated)]
use std::num::wrapping::WrappingOps;
use std::ops::Index;
use std::str::FromStr;
use std::string;
@ -1552,6 +1554,7 @@ impl<T: Iterator<Item=char>> Parser<T> {
}
}
#[allow(deprecated)] // possible resolve bug is mapping these to traits
fn parse_u64(&mut self) -> Result<u64, ParserError> {
let mut accum = 0;
let last_accum = 0; // necessary to detect overflow.

1
src/libstd/io/cursor.rs
View File

@ -14,7 +14,6 @@ use io::prelude::*;
use cmp;
use io::{self, SeekFrom, Error, ErrorKind};
use iter::repeat;
use num::Int;
use slice;
/// A `Cursor` is a type which wraps a non-I/O object to provide a `Seek`

3
src/libstd/net/mod.rs
View File

@ -18,6 +18,7 @@
use prelude::v1::*;
use io::{self, Error, ErrorKind};
#[allow(deprecated)] // Int
use num::Int;
use sys_common::net2 as net_imp;
@ -54,7 +55,9 @@ pub enum Shutdown {
Both,
}
#[allow(deprecated)] // Int
fn hton<I: Int>(i: I) -> I { i.to_be() }
#[allow(deprecated)] // Int
fn ntoh<I: Int>(i: I) -> I { Int::from_be(i) }
fn each_addr<A: ToSocketAddrs, F, T>(addr: A, mut f: F) -> io::Result<T>

756
src/libstd/num/f32.rs
View File

File diff suppressed because it is too large Load Diff

602
src/libstd/num/f64.rs
View File

File diff suppressed because it is too large Load Diff

13
src/libstd/num/mod.rs
View File

@ -15,6 +15,7 @@
#![stable(feature = "rust1", since = "1.0.0")]
#![allow(missing_docs)]
#![allow(deprecated)]
#[cfg(test)] use fmt::Debug;
use ops::{Add, Sub, Mul, Div, Rem, Neg};
@ -23,22 +24,24 @@ use marker::Copy;
use clone::Clone;
use cmp::{PartialOrd, PartialEq};
pub use core::num::{Int, SignedInt};
pub use core::num::{Int, SignedInt, Zero, One};
pub use core::num::{cast, FromPrimitive, NumCast, ToPrimitive};
pub use core::num::{from_int, from_i8, from_i16, from_i32, from_i64};
pub use core::num::{from_uint, from_u8, from_u16, from_u32, from_u64};
pub use core::num::{from_f32, from_f64};
pub use core::num::{FromStrRadix, from_str_radix};
pub use core::num::{FpCategory, ParseIntError, ParseFloatError};
pub use core::num::wrapping;
pub use core::num::{wrapping, Wrapping};
use option::Option;
#[unstable(feature = "std_misc", reason = "may be removed or relocated")]
#[unstable(feature = "std_misc", reason = "likely to be removed")]
pub mod strconv;
/// Mathematical operations on primitive floating point numbers.
#[stable(feature = "rust1", since = "1.0.0")]
#[deprecated(since = "1.0.0",
reason = "replaced by inherent methods; use rust-lang/num for generics")]
pub trait Float
: Copy + Clone
+ NumCast
@ -272,6 +275,7 @@ pub trait Float
/// ```
#[unstable(feature = "std_misc", reason = "position is undecided")]
fn is_finite(self) -> bool;
/// Returns `true` if the number is neither zero, infinite,
/// [subnormal][subnormal], or `NaN`.
///
@ -1148,7 +1152,7 @@ pub fn test_num<T>(ten: T, two: T) where
#[cfg(test)]
mod tests {
use prelude::v1::*;
use core::prelude::*;
use super::*;
use i8;
use i16;
@ -1160,6 +1164,7 @@ mod tests {
use u32;
use u64;
use usize;
use string::ToString;
macro_rules! test_cast_20 {
($_20:expr) => ({

1
src/libstd/num/strconv.rs
View File

@ -11,6 +11,7 @@
// ignore-lexer-test FIXME #15679
#![allow(missing_docs)]
#![allow(deprecated)]
use self::ExponentFormat::*;
use self::SignificantDigits::*;

3
src/libstd/prelude/v1.rs
View File

@ -51,6 +51,3 @@
#[doc(no_inline)] pub use string::{String, ToString};
#[stable(feature = "rust1", since = "1.0.0")]
#[doc(no_inline)] pub use vec::Vec;
// FIXME(#23454) should these be here?
#[doc(no_inline)] pub use num::wrapping::{Wrapping, WrappingOps};

1
src/libstd/sys/common/mod.rs
View File

@ -14,6 +14,7 @@ use old_io::{self, IoError, IoResult};
use prelude::v1::*;
use sys::{last_error, retry};
use ffi::CString;
#[allow(deprecated)] // Int
use num::Int;
#[allow(deprecated)]

1
src/libstd/sys/common/wtf8.rs
View File

@ -37,6 +37,7 @@ use fmt;
use hash::{Hash, Hasher};
use iter::{FromIterator, IntoIterator};
use mem;
#[allow(deprecated)] // Int
use num::Int;
use ops;
use slice;

2
src/libstd/sys/unix/mod.rs
View File

@ -171,6 +171,7 @@ pub fn retry<T, F> (mut f: F) -> T where
}
}
#[allow(deprecated)]
pub fn cvt<T: SignedInt>(t: T) -> io::Result<T> {
let one: T = Int::one();
if t == -one {
@ -180,6 +181,7 @@ pub fn cvt<T: SignedInt>(t: T) -> io::Result<T> {
}
}
#[allow(deprecated)]
pub fn cvt_r<T, F>(mut f: F) -> io::Result<T>
where T: SignedInt, F: FnMut() -> T
{

2
src/libstd/sys/windows/mod.rs
View File

@ -18,6 +18,7 @@ use ffi::{OsStr, OsString};
use io::{self, ErrorKind};
use libc;
use mem;
#[allow(deprecated)]
use num::Int;
use old_io::{self, IoResult, IoError};
use os::windows::ffi::{OsStrExt, OsStringExt};
@ -315,6 +316,7 @@ pub fn truncate_utf16_at_nul<'a>(v: &'a [u16]) -> &'a [u16] {
}
}
#[allow(deprecated)]
fn cvt<I: Int>(i: I) -> io::Result<I> {
if i == Int::zero() {
Err(io::Error::last_os_error())

3
src/libstd/sys/windows/net.rs
View File

@ -15,6 +15,7 @@ use libc::consts::os::extra::INVALID_SOCKET;
use libc::{self, c_int, c_void};
use mem;
use net::SocketAddr;
#[allow(deprecated)]
use num::{SignedInt, Int};
use rt;
use sync::{Once, ONCE_INIT};
@ -50,6 +51,7 @@ fn last_error() -> io::Error {
/// function must be called before another call to the socket API is made.
///
/// FIXME: generics needed?
#[allow(deprecated)]
pub fn cvt<T: SignedInt>(t: T) -> io::Result<T> {
let one: T = Int::one();
if t == -one {
@ -67,6 +69,7 @@ pub fn cvt_gai(err: c_int) -> io::Result<()> {
}
/// Provides the functionality of `cvt` for a closure.
#[allow(deprecated)]
pub fn cvt_r<T: SignedInt, F>(mut f: F) -> io::Result<T> where F: FnMut() -> T {
cvt(f())
}

1
src/libstd/time/duration.rs
View File

@ -16,6 +16,7 @@ use {fmt, i64};
use ops::{Add, Sub, Mul, Div, Neg, FnOnce};
use option::Option;
use option::Option::{Some, None};
#[allow(deprecated)] // Int
use num::Int;
use result::Result::Ok;

2
src/libsyntax/ast.rs
View File

@ -66,6 +66,7 @@ use parse::lexer;
use ptr::P;
use std::fmt;
#[allow(deprecated)]
use std::num::Int;
use std::rc::Rc;
use serialize::{Encodable, Decodable, Encoder, Decoder};
@ -1141,6 +1142,7 @@ pub enum Sign {
}
impl Sign {
#[allow(deprecated)] // Int
pub fn new<T:Int>(n: T) -> Sign {
if n < Int::zero() {
Minus

7
src/libsyntax/parse/lexer/mod.rs
View File

@ -20,7 +20,6 @@ use std::borrow::{IntoCow, Cow};
use std::char;
use std::fmt;
use std::mem::replace;
use std::num;
use std::rc::Rc;
pub use ext::tt::transcribe::{TtReader, new_tt_reader, new_tt_reader_with_doc_flag};
@ -622,8 +621,8 @@ impl<'a> StringReader<'a> {
// find the integer representing the name
self.scan_digits(base);
let encoded_name : u32 = self.with_str_from(start_bpos, |s| {
num::from_str_radix(s, 10).unwrap_or_else(|_| {
let encoded_name: u32 = self.with_str_from(start_bpos, |s| {
u32::from_str_radix(s, 10).unwrap_or_else(|_| {
panic!("expected digits representing a name, got {:?}, {}, range [{:?},{:?}]",
s, whence, start_bpos, self.last_pos);
})
@ -641,7 +640,7 @@ impl<'a> StringReader<'a> {
let start_bpos = self.last_pos;
self.scan_digits(base);
let encoded_ctxt : ast::SyntaxContext = self.with_str_from(start_bpos, |s| {
num::from_str_radix(s, 10).unwrap_or_else(|_| {
u32::from_str_radix(s, 10).unwrap_or_else(|_| {
panic!("expected digits representing a ctxt, got {:?}, {}", s, whence);
})
});

11
src/libsyntax/parse/mod.rs
View File

@ -21,6 +21,7 @@ use std::cell::{Cell, RefCell};
use std::fs::File;
use std::io::Read;
use std::iter;
#[allow(deprecated)] // Int
use std::num::Int;
use std::path::{Path, PathBuf};
use std::rc::Rc;
@ -372,7 +373,7 @@ pub fn maybe_aborted<T>(result: T, p: Parser) -> T {
/// well. Can take any slice prefixed by a character escape. Returns the
/// character and the number of characters consumed.
pub fn char_lit(lit: &str) -> (char, isize) {
use std::{num, char};
use std::char;
let mut chars = lit.chars();
let c = match (chars.next(), chars.next()) {
@ -399,7 +400,7 @@ pub fn char_lit(lit: &str) -> (char, isize) {
let msg2 = &msg[..];
fn esc(len: usize, lit: &str) -> Option<(char, isize)> {
num::from_str_radix(&lit[2..len], 16).ok()
u32::from_str_radix(&lit[2..len], 16).ok()
.and_then(char::from_u32)
.map(|x| (x, len as isize))
}
@ -408,7 +409,7 @@ pub fn char_lit(lit: &str) -> (char, isize) {
if lit.as_bytes()[2] == b'{' {
let idx = lit.find('}').expect(msg2);
let subslice = &lit[3..idx];
num::from_str_radix(subslice, 16).ok()
u32::from_str_radix(subslice, 16).ok()
.and_then(char::from_u32)
.map(|x| (x, subslice.chars().count() as isize + 4))
} else {
@ -582,7 +583,7 @@ pub fn byte_lit(lit: &str) -> (u8, usize) {
b'\'' => b'\'',
b'0' => b'\0',
_ => {
match ::std::num::from_str_radix::<u64>(&lit[2..4], 16).ok() {
match u64::from_str_radix(&lit[2..4], 16).ok() {
Some(c) =>
if c > 0xFF {
panic!(err(2))
@ -733,7 +734,7 @@ pub fn integer_lit(s: &str, suffix: Option<&str>, sd: &SpanHandler, sp: Span) ->
debug!("integer_lit: the type is {:?}, base {:?}, the new string is {:?}, the original \
string was {:?}, the original suffix was {:?}", ty, base, s, orig, suffix);
let res: u64 = match ::std::num::from_str_radix(s, base).ok() {
let res = match u64::from_str_radix(s, base).ok() {
Some(r) => r,
None => { sd.span_err(sp, "int literal is too large"); 0 }
};

1
src/libtest/stats.rs
View File

@ -9,6 +9,7 @@
// except according to those terms.
#![allow(missing_docs)]
#![allow(deprecated)] // Float
use std::cmp::Ordering::{self, Less, Greater, Equal};
use std::mem;

1
src/libunicode/u_str.rs
View File

@ -22,7 +22,6 @@ use core::char;
use core::cmp;
use core::iter::{Filter, AdditiveIterator};
use core::mem;
use core::num::Int;
use core::slice;
use core::str::Split;

2
src/test/compile-fail/lint-dead-code-4.rs
View File

@ -16,8 +16,6 @@
extern crate libc;
use std::num::Int;
struct Foo {
x: usize,
b: bool, //~ ERROR: struct field is never used

7
src/test/compile-fail/range-1.rs
View File

@ -15,9 +15,10 @@ pub fn main() {
let _ = 0u32..10i32;
//~^ ERROR start and end of range have incompatible types
// Float => does not implement iterator.
for i in 0f32..42f32 {}
//~^ ERROR the trait `core::num::Int` is not implemented for the type `f32`
// Bool => does not implement iterator.
for i in false..true {}
//~^ ERROR the trait
//~^^ ERROR the trait
// Unsized type.
let arr: &[_] = &[1, 2, 3];

8
src/test/run-pass/generic-extern-mangle.rs
View File

@ -12,11 +12,11 @@
#![feature(core)]
use std::num::Int;
use std::ops::Add;
extern "C" fn foo<T: WrappingOps>(a: T, b: T) -> T { a.wrapping_add(b) }
extern "C" fn foo<T: Add>(a: T, b: T) -> T::Output { a + b }
fn main() {
assert_eq!(99u8, foo(255u8, 100u8));
assert_eq!(99u16, foo(65535u16, 100u16));
assert_eq!(100u8, foo(0u8, 100u8));
assert_eq!(100u16, foo(0u16, 100u16));
}