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num-traits
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Merge #60 

60: i128 r=cuviper a=regexident



Co-authored-by: Vincent Esche <regexident@gmail.com>
Co-authored-by: Josh Stone <cuviper@gmail.com>
This commit is contained in:
bors[bot] 2018-05-08 21:43:10 +00:00
parent dd67e9d2e1 1af2319201
commit 6edb91f5e8
17 changed files with 658 additions and 316 deletions
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2
.travis.yml
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@ -1,6 +1,8 @@
language: rust
rust:
- 1.8.0
- 1.15.0
- 1.20.0
- stable
- beta
- nightly

1
Cargo.toml
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@ -16,3 +16,4 @@ readme = "README.md"
[features]
default = ["std"]
std = []
i128 = []

4
README.md
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@ -25,7 +25,7 @@ extern crate num_traits;
## Features
This crate can be used without the standard library (`#![no_std]`) by disabling
the default `std` feature. Use this in `Cargo.toml`:
the default `std` feature. Use this in `Cargo.toml`:
```toml
[dependencies.num-traits]
@ -36,6 +36,8 @@ default-features = false
The `Float` and `Real` traits are only available when `std` is enabled. The
`FloatCore` trait is always available.
Implementations for `i128` and `u128` are only available when `i128` is enabled.
## Releases
Release notes are available in [RELEASES.md](RELEASES.md).

3
ci/rustup.sh
View File

@ -5,8 +5,7 @@
set -ex
export TRAVIS_RUST_VERSION
for TRAVIS_RUST_VERSION in 1.8.0 stable beta nightly; do
for TRAVIS_RUST_VERSION in 1.8.0 1.15.0 1.20.0 stable beta nightly; do
run="rustup run $TRAVIS_RUST_VERSION"
$run cargo build --verbose
$run $PWD/ci/test_full.sh
done

6
ci/test_full.sh
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@ -11,3 +11,9 @@ cargo test --verbose
# test `no_std`
cargo build --verbose --no-default-features
cargo test --verbose --no-default-features
# test `i128`
if [[ "$TRAVIS_RUST_VERSION" =~ ^(nightly|beta)$ ]]; then
cargo build --verbose --features=i128
cargo test --verbose --features=i128
fi

21
src/bounds.rs
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@ -2,6 +2,8 @@ use core::{usize, u8, u16, u32, u64};
use core::{isize, i8, i16, i32, i64};
use core::{f32, f64};
use core::num::Wrapping;
#[cfg(feature = "i128")]
use core::{i128, u128};
/// Numbers which have upper and lower bounds
pub trait Bounded {
@ -29,12 +31,16 @@ bounded_impl!(u8, u8::MIN, u8::MAX);
bounded_impl!(u16, u16::MIN, u16::MAX);
bounded_impl!(u32, u32::MIN, u32::MAX);
bounded_impl!(u64, u64::MIN, u64::MAX);
#[cfg(feature = "i128")]
bounded_impl!(u128, u128::MIN, u128::MAX);
bounded_impl!(isize, isize::MIN, isize::MAX);
bounded_impl!(i8, i8::MIN, i8::MAX);
bounded_impl!(i16, i16::MIN, i16::MAX);
bounded_impl!(i32, i32::MIN, i32::MAX);
bounded_impl!(i64, i64::MIN, i64::MAX);
#[cfg(feature = "i128")]
bounded_impl!(i128, i128::MIN, i128::MAX);
impl<T: Bounded> Bounded for Wrapping<T> {
fn min_value() -> Self { Wrapping(T::min_value()) }
@ -91,6 +97,21 @@ fn wrapping_bounded() {
test_wrapping_bounded!(usize u8 u16 u32 u64 isize i8 i16 i32 i64);
}
#[cfg(feature = "i128")]
#[test]
fn wrapping_bounded_i128() {
macro_rules! test_wrapping_bounded {
($($t:ty)+) => {
$(
assert_eq!(Wrapping::<$t>::min_value().0, <$t>::min_value());
assert_eq!(Wrapping::<$t>::max_value().0, <$t>::max_value());
)+
};
}
test_wrapping_bounded!(u128 i128);
}
#[test]
fn wrapping_is_bounded() {
fn require_bounded<T: Bounded>(_: &T) {}

478
src/cast.rs
View File

@ -3,6 +3,8 @@ use core::{u8, u16, u32, u64, usize};
use core::{f32, f64};
use core::mem::size_of;
use core::num::Wrapping;
#[cfg(feature = "i128")]
use core::{i128, u128};
use float::FloatCore;
@ -35,6 +37,18 @@ pub trait ToPrimitive {
/// Converts the value of `self` to an `i64`.
fn to_i64(&self) -> Option<i64>;
/// Converts the value of `self` to an `i128`.
///
/// This method is only available with feature `i128` enabled on Rust >= 1.26.
///
/// The default implementation converts through `to_i64()`. Types implementing
/// this trait should override this method if they can represent a greater range.
#[inline]
#[cfg(feature = "i128")]
fn to_i128(&self) -> Option<i128> {
self.to_i64().map(From::from)
}
/// Converts the value of `self` to a `usize`.
#[inline]
fn to_usize(&self) -> Option<usize> {
@ -63,6 +77,18 @@ pub trait ToPrimitive {
#[inline]
fn to_u64(&self) -> Option<u64>;
/// Converts the value of `self` to an `u128`.
///
/// This method is only available with feature `i128` enabled on Rust >= 1.26.
///
/// The default implementation converts through `to_u64()`. Types implementing
/// this trait should override this method if they can represent a greater range.
#[inline]
#[cfg(feature = "i128")]
fn to_u128(&self) -> Option<u128> {
self.to_u64().map(From::from)
}
/// Converts the value of `self` to an `f32`.
#[inline]
fn to_f32(&self) -> Option<f32> {
@ -77,8 +103,9 @@ pub trait ToPrimitive {
}
macro_rules! impl_to_primitive_int_to_int {
($SrcT:ident : $( fn $method:ident -> $DstT:ident ; )*) => {$(
($SrcT:ident : $( $(#[$cfg:meta])* fn $method:ident -> $DstT:ident ; )*) => {$(
#[inline]
$(#[$cfg])*
fn $method(&self) -> Option<$DstT> {
let min = $DstT::MIN as $SrcT;
let max = $DstT::MAX as $SrcT;
@ -92,11 +119,12 @@ macro_rules! impl_to_primitive_int_to_int {
}
macro_rules! impl_to_primitive_int_to_uint {
($SrcT:ident : $( fn $method:ident -> $DstT:ident ; )*) => {$(
($SrcT:ident : $( $(#[$cfg:meta])* fn $method:ident -> $DstT:ident ; )*) => {$(
#[inline]
$(#[$cfg])*
fn $method(&self) -> Option<$DstT> {
let max = $DstT::MAX as u64;
if 0 <= *self && (size_of::<$SrcT>() < size_of::<$DstT>() || *self as u64 <= max) {
let max = $DstT::MAX as $SrcT;
if 0 <= *self && (size_of::<$SrcT>() <= size_of::<$DstT>() || *self <= max) {
Some(*self as $DstT)
} else {
None
@ -114,6 +142,8 @@ macro_rules! impl_to_primitive_int {
fn to_i16 -> i16;
fn to_i32 -> i32;
fn to_i64 -> i64;
#[cfg(feature = "i128")]
fn to_i128 -> i128;
}
impl_to_primitive_int_to_uint! { $T:
@ -122,6 +152,8 @@ macro_rules! impl_to_primitive_int {
fn to_u16 -> u16;
fn to_u32 -> u32;
fn to_u64 -> u64;
#[cfg(feature = "i128")]
fn to_u128 -> u128;
}
#[inline]
@ -137,13 +169,16 @@ impl_to_primitive_int!(i8);
impl_to_primitive_int!(i16);
impl_to_primitive_int!(i32);
impl_to_primitive_int!(i64);
#[cfg(feature = "i128")]
impl_to_primitive_int!(i128);
macro_rules! impl_to_primitive_uint_to_int {
($SrcT:ident : $( fn $method:ident -> $DstT:ident ; )*) => {$(
($SrcT:ident : $( $(#[$cfg:meta])* fn $method:ident -> $DstT:ident ; )*) => {$(
#[inline]
$(#[$cfg])*
fn $method(&self) -> Option<$DstT> {
let max = $DstT::MAX as u64;
if size_of::<$SrcT>() < size_of::<$DstT>() || *self as u64 <= max {
let max = $DstT::MAX as $SrcT;
if size_of::<$SrcT>() < size_of::<$DstT>() || *self <= max {
Some(*self as $DstT)
} else {
None
@ -153,8 +188,9 @@ macro_rules! impl_to_primitive_uint_to_int {
}
macro_rules! impl_to_primitive_uint_to_uint {
($SrcT:ident : $( fn $method:ident -> $DstT:ident ; )*) => {$(
($SrcT:ident : $( $(#[$cfg:meta])* fn $method:ident -> $DstT:ident ; )*) => {$(
#[inline]
$(#[$cfg])*
fn $method(&self) -> Option<$DstT> {
let max = $DstT::MAX as $SrcT;
if size_of::<$SrcT>() <= size_of::<$DstT>() || *self <= max {
@ -175,6 +211,8 @@ macro_rules! impl_to_primitive_uint {
fn to_i16 -> i16;
fn to_i32 -> i32;
fn to_i64 -> i64;
#[cfg(feature = "i128")]
fn to_i128 -> i128;
}
impl_to_primitive_uint_to_uint! { $T:
@ -183,6 +221,8 @@ macro_rules! impl_to_primitive_uint {
fn to_u16 -> u16;
fn to_u32 -> u32;
fn to_u64 -> u64;
#[cfg(feature = "i128")]
fn to_u128 -> u128;
}
#[inline]
@ -198,6 +238,8 @@ impl_to_primitive_uint!(u8);
impl_to_primitive_uint!(u16);
impl_to_primitive_uint!(u32);
impl_to_primitive_uint!(u64);
#[cfg(feature = "i128")]
impl_to_primitive_uint!(u128);
macro_rules! impl_to_primitive_float_to_float {
($SrcT:ident : $( fn $method:ident -> $DstT:ident ; )*) => {$(
@ -217,8 +259,9 @@ macro_rules! impl_to_primitive_float_to_float {
}
macro_rules! impl_to_primitive_float_to_signed_int {
($f:ident : $( fn $method:ident -> $i:ident ; )*) => {$(
($f:ident : $( $(#[$cfg:meta])* fn $method:ident -> $i:ident ; )*) => {$(
#[inline]
$(#[$cfg])*
fn $method(&self) -> Option<$i> {
// Float as int truncates toward zero, so we want to allow values
// in the exclusive range `(MIN-1, MAX+1)`.
@ -246,8 +289,9 @@ macro_rules! impl_to_primitive_float_to_signed_int {
}
macro_rules! impl_to_primitive_float_to_unsigned_int {
($f:ident : $( fn $method:ident -> $u:ident ; )*) => {$(
($f:ident : $( $(#[$cfg:meta])* fn $method:ident -> $u:ident ; )*) => {$(
#[inline]
$(#[$cfg])*
fn $method(&self) -> Option<$u> {
// Float as int truncates toward zero, so we want to allow values
// in the exclusive range `(-1, MAX+1)`.
@ -260,6 +304,7 @@ macro_rules! impl_to_primitive_float_to_unsigned_int {
} else {
// We can't represent `MAX` exactly, but it will round up to exactly
// `MAX+1` (a power of two) when we cast it.
// (`u128::MAX as f32` is infinity, but this is still ok.)
const MAX_P1: $f = $u::MAX as $f;
if *self > -1.0 && *self < MAX_P1 {
return Some(*self as $u);
@ -279,6 +324,8 @@ macro_rules! impl_to_primitive_float {
fn to_i16 -> i16;
fn to_i32 -> i32;
fn to_i64 -> i64;
#[cfg(feature = "i128")]
fn to_i128 -> i128;
}
impl_to_primitive_float_to_unsigned_int! { $T:
@ -287,6 +334,8 @@ macro_rules! impl_to_primitive_float {
fn to_u16 -> u16;
fn to_u32 -> u32;
fn to_u64 -> u64;
#[cfg(feature = "i128")]
fn to_u128 -> u128;
}
impl_to_primitive_float_to_float! { $T:
@ -334,6 +383,19 @@ pub trait FromPrimitive: Sized {
/// type cannot be represented by this value, the `None` is returned.
fn from_i64(n: i64) -> Option<Self>;
/// Convert an `i128` to return an optional value of this type. If the
/// type cannot be represented by this value, the `None` is returned.
///
/// This method is only available with feature `i128` enabled on Rust >= 1.26.
///
/// The default implementation converts through `from_i64()`. Types implementing
/// this trait should override this method if they can represent a greater range.
#[inline]
#[cfg(feature = "i128")]
fn from_i128(n: i128) -> Option<Self> {
n.to_i64().and_then(FromPrimitive::from_i64)
}
/// Convert a `usize` to return an optional value of this type. If the
/// type cannot be represented by this value, the `None` is returned.
#[inline]
@ -366,6 +428,19 @@ pub trait FromPrimitive: Sized {
/// type cannot be represented by this value, the `None` is returned.
fn from_u64(n: u64) -> Option<Self>;
/// Convert an `u128` to return an optional value of this type. If the
/// type cannot be represented by this value, the `None` is returned.
///
/// This method is only available with feature `i128` enabled on Rust >= 1.26.
///
/// The default implementation converts through `from_u64()`. Types implementing
/// this trait should override this method if they can represent a greater range.
#[inline]
#[cfg(feature = "i128")]
fn from_u128(n: u128) -> Option<Self> {
n.to_u64().and_then(FromPrimitive::from_u64)
}
/// Convert a `f32` to return an optional value of this type. If the
/// type cannot be represented by this value, the `None` is returned.
#[inline]
@ -389,11 +464,15 @@ macro_rules! impl_from_primitive {
#[inline] fn from_i16(n: i16) -> Option<$T> { n.$to_ty() }
#[inline] fn from_i32(n: i32) -> Option<$T> { n.$to_ty() }
#[inline] fn from_i64(n: i64) -> Option<$T> { n.$to_ty() }
#[cfg(feature = "i128")]
#[inline] fn from_i128(n: i128) -> Option<$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.$to_ty() }
#[cfg(feature = "i128")]
#[inline] fn from_u128(n: u128) -> Option<$T> { n.$to_ty() }
#[inline] fn from_f32(n: f32) -> Option<$T> { n.$to_ty() }
#[inline] fn from_f64(n: f64) -> Option<$T> { n.$to_ty() }
@ -406,22 +485,83 @@ impl_from_primitive!(i8, to_i8);
impl_from_primitive!(i16, to_i16);
impl_from_primitive!(i32, to_i32);
impl_from_primitive!(i64, to_i64);
#[cfg(feature = "i128")]
impl_from_primitive!(i128, to_i128);
impl_from_primitive!(usize, to_usize);
impl_from_primitive!(u8, to_u8);
impl_from_primitive!(u16, to_u16);
impl_from_primitive!(u32, to_u32);
impl_from_primitive!(u64, to_u64);
#[cfg(feature = "i128")]
impl_from_primitive!(u128, to_u128);
impl_from_primitive!(f32, to_f32);
impl_from_primitive!(f64, to_f64);
impl<T: ToPrimitive> ToPrimitive for Wrapping<T> {
fn to_i64(&self) -> Option<i64> { self.0.to_i64() }
fn to_u64(&self) -> Option<u64> { self.0.to_u64() }
macro_rules! impl_to_primitive_wrapping {
($( $(#[$cfg:meta])* fn $method:ident -> $i:ident ; )*) => {$(
#[inline]
$(#[$cfg])*
fn $method(&self) -> Option<$i> {
(self.0).$method()
}
)*}
}
impl<T: ToPrimitive> ToPrimitive for Wrapping<T> {
impl_to_primitive_wrapping! {
fn to_isize -> isize;
fn to_i8 -> i8;
fn to_i16 -> i16;
fn to_i32 -> i32;
fn to_i64 -> i64;
#[cfg(feature = "i128")]
fn to_i128 -> i128;
fn to_usize -> usize;
fn to_u8 -> u8;
fn to_u16 -> u16;
fn to_u32 -> u32;
fn to_u64 -> u64;
#[cfg(feature = "i128")]
fn to_u128 -> u128;
fn to_f32 -> f32;
fn to_f64 -> f64;
}
}
macro_rules! impl_from_primitive_wrapping {
($( $(#[$cfg:meta])* fn $method:ident ( $i:ident ); )*) => {$(
#[inline]
$(#[$cfg])*
fn $method(n: $i) -> Option<Self> {
T::$method(n).map(Wrapping)
}
)*}
}
impl<T: FromPrimitive> FromPrimitive for Wrapping<T> {
fn from_u64(n: u64) -> Option<Self> { T::from_u64(n).map(Wrapping) }
fn from_i64(n: i64) -> Option<Self> { T::from_i64(n).map(Wrapping) }
impl_from_primitive_wrapping! {
fn from_isize(isize);
fn from_i8(i8);
fn from_i16(i16);
fn from_i32(i32);
fn from_i64(i64);
#[cfg(feature = "i128")]
fn from_i128(i128);
fn from_usize(usize);
fn from_u8(u8);
fn from_u16(u16);
fn from_u32(u32);
fn from_u64(u64);
#[cfg(feature = "i128")]
fn from_u128(u128);
fn from_f32(f32);
fn from_f64(f64);
}
}
@ -465,11 +605,15 @@ impl_num_cast!(u8, to_u8);
impl_num_cast!(u16, to_u16);
impl_num_cast!(u32, to_u32);
impl_num_cast!(u64, to_u64);
#[cfg(feature = "i128")]
impl_num_cast!(u128, to_u128);
impl_num_cast!(usize, to_usize);
impl_num_cast!(i8, to_i8);
impl_num_cast!(i16, to_i16);
impl_num_cast!(i32, to_i32);
impl_num_cast!(i64, to_i64);
#[cfg(feature = "i128")]
impl_num_cast!(i128, to_i128);
impl_num_cast!(isize, to_isize);
impl_num_cast!(f32, to_f32);
impl_num_cast!(f64, to_f64);
@ -524,284 +668,40 @@ where
}
macro_rules! impl_as_primitive {
($T: ty => $( $U: ty ),* ) => {
$(
(@ $T: ty => $(#[$cfg:meta])* impl $U: ty ) => {
$(#[$cfg])*
impl AsPrimitive<$U> for $T {
#[inline] fn as_(self) -> $U { self as $U }
}
)*
};
(@ $T: ty => { $( $U: ty ),* } ) => {$(
impl_as_primitive!(@ $T => impl $U);
)*};
($T: ty => { $( $U: ty ),* } ) => {
impl_as_primitive!(@ $T => { $( $U ),* });
impl_as_primitive!(@ $T => { u8, u16, u32, u64, usize });
impl_as_primitive!(@ $T => #[cfg(feature = "i128")] impl u128);
impl_as_primitive!(@ $T => { i8, i16, i32, i64, isize });
impl_as_primitive!(@ $T => #[cfg(feature = "i128")] impl i128);
};
}
impl_as_primitive!(u8 => char, u8, i8, u16, i16, u32, i32, u64, isize, usize, i64, f32, f64);
impl_as_primitive!(i8 => u8, i8, u16, i16, u32, i32, u64, isize, usize, i64, f32, f64);
impl_as_primitive!(u16 => u8, i8, u16, i16, u32, i32, u64, isize, usize, i64, f32, f64);
impl_as_primitive!(i16 => u8, i8, u16, i16, u32, i32, u64, isize, usize, i64, f32, f64);
impl_as_primitive!(u32 => u8, i8, u16, i16, u32, i32, u64, isize, usize, i64, f32, f64);
impl_as_primitive!(i32 => u8, i8, u16, i16, u32, i32, u64, isize, usize, i64, f32, f64);
impl_as_primitive!(u64 => u8, i8, u16, i16, u32, i32, u64, isize, usize, i64, f32, f64);
impl_as_primitive!(i64 => u8, i8, u16, i16, u32, i32, u64, isize, usize, i64, f32, f64);
impl_as_primitive!(usize => u8, i8, u16, i16, u32, i32, u64, isize, usize, i64, f32, f64);
impl_as_primitive!(isize => u8, i8, u16, i16, u32, i32, u64, isize, usize, i64, f32, f64);
impl_as_primitive!(f32 => u8, i8, u16, i16, u32, i32, u64, isize, usize, i64, f32, f64);
impl_as_primitive!(f64 => u8, i8, u16, i16, u32, i32, u64, isize, usize, i64, f32, f64);
impl_as_primitive!(char => char, u8, i8, u16, i16, u32, i32, u64, isize, usize, i64);
impl_as_primitive!(bool => u8, i8, u16, i16, u32, i32, u64, isize, usize, i64);
impl_as_primitive!(u8 => { char, f32, f64 });
impl_as_primitive!(i8 => { f32, f64 });
impl_as_primitive!(u16 => { f32, f64 });
impl_as_primitive!(i16 => { f32, f64 });
impl_as_primitive!(u32 => { f32, f64 });
impl_as_primitive!(i32 => { f32, f64 });
impl_as_primitive!(u64 => { f32, f64 });
impl_as_primitive!(i64 => { f32, f64 });
#[cfg(feature = "i128")]
impl_as_primitive!(u128 => { f32, f64 });
#[cfg(feature = "i128")]
impl_as_primitive!(i128 => { f32, f64 });
impl_as_primitive!(usize => { f32, f64 });
impl_as_primitive!(isize => { f32, f64 });
impl_as_primitive!(f32 => { f32, f64 });
impl_as_primitive!(f64 => { f32, f64 });
impl_as_primitive!(char => { char });
impl_as_primitive!(bool => {});
#[test]
fn to_primitive_float() {
use core::f32;
use core::f64;
let f32_toolarge = 1e39f64;
assert_eq!(f32_toolarge.to_f32(), None);
assert_eq!((f32::MAX as f64).to_f32(), Some(f32::MAX));
assert_eq!((-f32::MAX as f64).to_f32(), Some(-f32::MAX));
assert_eq!(f64::INFINITY.to_f32(), Some(f32::INFINITY));
assert_eq!((f64::NEG_INFINITY).to_f32(), Some(f32::NEG_INFINITY));
assert!((f64::NAN).to_f32().map_or(false, |f| f.is_nan()));
}
#[test]
fn wrapping_to_primitive() {
macro_rules! test_wrapping_to_primitive {
($($t:ty)+) => {
$({
let i: $t = 0;
let w = Wrapping(i);
assert_eq!(i.to_u8(), w.to_u8());
assert_eq!(i.to_u16(), w.to_u16());
assert_eq!(i.to_u32(), w.to_u32());
assert_eq!(i.to_u64(), w.to_u64());
assert_eq!(i.to_usize(), w.to_usize());
assert_eq!(i.to_i8(), w.to_i8());
assert_eq!(i.to_i16(), w.to_i16());
assert_eq!(i.to_i32(), w.to_i32());
assert_eq!(i.to_i64(), w.to_i64());
assert_eq!(i.to_isize(), w.to_isize());
assert_eq!(i.to_f32(), w.to_f32());
assert_eq!(i.to_f64(), w.to_f64());
})+
};
}
test_wrapping_to_primitive!(usize u8 u16 u32 u64 isize i8 i16 i32 i64);
}
#[test]
fn wrapping_is_toprimitive() {
fn require_toprimitive<T: ToPrimitive>(_: &T) {}
require_toprimitive(&Wrapping(42));
}
#[test]
fn wrapping_is_fromprimitive() {
fn require_fromprimitive<T: FromPrimitive>(_: &T) {}
require_fromprimitive(&Wrapping(42));
}
#[test]
fn wrapping_is_numcast() {
fn require_numcast<T: NumCast>(_: &T) {}
require_numcast(&Wrapping(42));
}
#[test]
fn as_primitive() {
let x: f32 = (1.625f64).as_();
assert_eq!(x, 1.625f32);
let x: f32 = (3.14159265358979323846f64).as_();
assert_eq!(x, 3.1415927f32);
let x: u8 = (768i16).as_();
assert_eq!(x, 0);
}
#[test]
fn float_to_integer_checks_overflow() {
// This will overflow an i32
let source: f64 = 1.0e+123f64;
// Expect the overflow to be caught
assert_eq!(cast::<f64, i32>(source), None);
}
#[test]
fn cast_to_int_checks_overflow() {
let big_f: f64 = 1.0e123;
let normal_f: f64 = 1.0;
let small_f: f64 = -1.0e123;
assert_eq!(None, cast::<f64, isize>(big_f));
assert_eq!(None, cast::<f64, i8>(big_f));
assert_eq!(None, cast::<f64, i16>(big_f));
assert_eq!(None, cast::<f64, i32>(big_f));
assert_eq!(None, cast::<f64, i64>(big_f));
assert_eq!(Some(normal_f as isize), cast::<f64, isize>(normal_f));
assert_eq!(Some(normal_f as i8), cast::<f64, i8>(normal_f));
assert_eq!(Some(normal_f as i16), cast::<f64, i16>(normal_f));
assert_eq!(Some(normal_f as i32), cast::<f64, i32>(normal_f));
assert_eq!(Some(normal_f as i64), cast::<f64, i64>(normal_f));
assert_eq!(None, cast::<f64, isize>(small_f));
assert_eq!(None, cast::<f64, i8>(small_f));
assert_eq!(None, cast::<f64, i16>(small_f));
assert_eq!(None, cast::<f64, i32>(small_f));
assert_eq!(None, cast::<f64, i64>(small_f));
}
#[test]
fn cast_to_unsigned_int_checks_overflow() {
let big_f: f64 = 1.0e123;
let normal_f: f64 = 1.0;
let small_f: f64 = -1.0e123;
assert_eq!(None, cast::<f64, usize>(big_f));
assert_eq!(None, cast::<f64, u8>(big_f));
assert_eq!(None, cast::<f64, u16>(big_f));
assert_eq!(None, cast::<f64, u32>(big_f));
assert_eq!(None, cast::<f64, u64>(big_f));
assert_eq!(Some(normal_f as usize), cast::<f64, usize>(normal_f));
assert_eq!(Some(normal_f as u8), cast::<f64, u8>(normal_f));
assert_eq!(Some(normal_f as u16), cast::<f64, u16>(normal_f));
assert_eq!(Some(normal_f as u32), cast::<f64, u32>(normal_f));
assert_eq!(Some(normal_f as u64), cast::<f64, u64>(normal_f));
assert_eq!(None, cast::<f64, usize>(small_f));
assert_eq!(None, cast::<f64, u8>(small_f));
assert_eq!(None, cast::<f64, u16>(small_f));
assert_eq!(None, cast::<f64, u32>(small_f));
assert_eq!(None, cast::<f64, u64>(small_f));
}
#[cfg(all(test, feature = "std"))]
fn dbg(args: ::core::fmt::Arguments) {
println!("{}", args);
}
#[cfg(all(test, not(feature = "std")))]
fn dbg(_: ::core::fmt::Arguments) {}
// Rust 1.8 doesn't handle cfg on macros correctly
// #[cfg(test)]
#[allow(unused)]
macro_rules! dbg { ($($tok:tt)*) => { dbg(format_args!($($tok)*)) } }
#[test]
fn cast_float_to_int_edge_cases() {
use core::mem::transmute;
trait RawOffset: Sized {
type Raw;
fn raw_offset(self, offset: Self::Raw) -> Self;
}
impl RawOffset for f32 {
type Raw = i32;
fn raw_offset(self, offset: Self::Raw) -> Self {
unsafe {
let raw: Self::Raw = transmute(self);
transmute(raw + offset)
}
}
}
impl RawOffset for f64 {
type Raw = i64;
fn raw_offset(self, offset: Self::Raw) -> Self {
unsafe {
let raw: Self::Raw = transmute(self);
transmute(raw + offset)
}
}
}
macro_rules! test_edge {
($f:ident -> $($t:ident)+) => { $({
dbg!("testing cast edge cases for {} -> {}", stringify!($f), stringify!($t));
let small = if $t::MIN == 0 || size_of::<$t>() < size_of::<$f>() {
$t::MIN as $f - 1.0
} else {
($t::MIN as $f).raw_offset(1).floor()
};
let fmin = small.raw_offset(-1);
dbg!(" testing min {}\n\tvs. {:.16}\n\tand {:.16}", $t::MIN, fmin, small);
assert_eq!(Some($t::MIN), cast::<$f, $t>($t::MIN as $f));
assert_eq!(Some($t::MIN), cast::<$f, $t>(fmin));
assert_eq!(None, cast::<$f, $t>(small));
let (max, large) = if size_of::<$t>() < size_of::<$f>() {
($t::MAX, $t::MAX as $f + 1.0)
} else {
let large = $t::MAX as $f; // rounds up!
let max = large.raw_offset(-1) as $t; // the next smallest possible
assert_eq!(max.count_ones(), $f::MANTISSA_DIGITS);
(max, large)
};
let fmax = large.raw_offset(-1);
dbg!(" testing max {}\n\tvs. {:.16}\n\tand {:.16}", max, fmax, large);
assert_eq!(Some(max), cast::<$f, $t>(max as $f));
assert_eq!(Some(max), cast::<$f, $t>(fmax));
assert_eq!(None, cast::<$f, $t>(large));
dbg!(" testing non-finite values");
assert_eq!(None, cast::<$f, $t>($f::NAN));
assert_eq!(None, cast::<$f, $t>($f::INFINITY));
assert_eq!(None, cast::<$f, $t>($f::NEG_INFINITY));
})+}
}
test_edge!(f32 -> isize i8 i16 i32 i64);
test_edge!(f32 -> usize u8 u16 u32 u64);
test_edge!(f64 -> isize i8 i16 i32 i64);
test_edge!(f64 -> usize u8 u16 u32 u64);
}
#[test]
fn cast_int_to_int_edge_cases() {
use core::cmp::Ordering::*;
macro_rules! test_edge {
($f:ident -> $($t:ident)+) => { $({
fn test_edge() {
dbg!("testing cast edge cases for {} -> {}", stringify!($f), stringify!($t));
match ($f::MIN as i64).cmp(&($t::MIN as i64)) {
Greater => {
assert_eq!(Some($f::MIN as $t), cast::<$f, $t>($f::MIN));
}
Equal => {
assert_eq!(Some($t::MIN), cast::<$f, $t>($f::MIN));
}
Less => {
let min = $t::MIN as $f;
assert_eq!(Some($t::MIN), cast::<$f, $t>(min));
assert_eq!(None, cast::<$f, $t>(min - 1));
}
}
match ($f::MAX as u64).cmp(&($t::MAX as u64)) {
Greater => {
let max = $t::MAX as $f;
assert_eq!(Some($t::MAX), cast::<$f, $t>(max));
assert_eq!(None, cast::<$f, $t>(max + 1));
}
Equal => {
assert_eq!(Some($t::MAX), cast::<$f, $t>($f::MAX));
}
Less => {
assert_eq!(Some($f::MAX as $t), cast::<$f, $t>($f::MAX));
}
}
}
test_edge();
})+};
($( $from:ident )+) => { $({
test_edge!($from -> isize i8 i16 i32 i64);
test_edge!($from -> usize u8 u16 u32 u64);
})+}
}
test_edge!(isize i8 i16 i32 i64);
test_edge!(usize u8 u16 u32 u64);
}

56
src/identities.rs
View File

@ -36,20 +36,24 @@ macro_rules! zero_impl {
}
}
zero_impl!(usize, 0usize);
zero_impl!(u8, 0u8);
zero_impl!(u16, 0u16);
zero_impl!(u32, 0u32);
zero_impl!(u64, 0u64);
zero_impl!(usize, 0);
zero_impl!(u8, 0);
zero_impl!(u16, 0);
zero_impl!(u32, 0);
zero_impl!(u64, 0);
#[cfg(feature = "i128")]
zero_impl!(u128, 0);
zero_impl!(isize, 0isize);
zero_impl!(i8, 0i8);
zero_impl!(i16, 0i16);
zero_impl!(i32, 0i32);
zero_impl!(i64, 0i64);
zero_impl!(isize, 0);
zero_impl!(i8, 0);
zero_impl!(i16, 0);
zero_impl!(i32, 0);
zero_impl!(i64, 0);
#[cfg(feature = "i128")]
zero_impl!(i128, 0);
zero_impl!(f32, 0.0f32);
zero_impl!(f64, 0.0f64);
zero_impl!(f32, 0.0);
zero_impl!(f64, 0.0);
impl<T: Zero> Zero for Wrapping<T> where Wrapping<T>: Add<Output=Wrapping<T>> {
fn is_zero(&self) -> bool {
@ -100,20 +104,24 @@ macro_rules! one_impl {
}
}
one_impl!(usize, 1usize);
one_impl!(u8, 1u8);
one_impl!(u16, 1u16);
one_impl!(u32, 1u32);
one_impl!(u64, 1u64);
one_impl!(usize, 1);
one_impl!(u8, 1);
one_impl!(u16, 1);
one_impl!(u32, 1);
one_impl!(u64, 1);
#[cfg(feature = "i128")]
one_impl!(u128, 1);
one_impl!(isize, 1isize);
one_impl!(i8, 1i8);
one_impl!(i16, 1i16);
one_impl!(i32, 1i32);
one_impl!(i64, 1i64);
one_impl!(isize, 1);
one_impl!(i8, 1);
one_impl!(i16, 1);
one_impl!(i32, 1);
one_impl!(i64, 1);
#[cfg(feature = "i128")]
one_impl!(i128, 1);
one_impl!(f32, 1.0f32);
one_impl!(f64, 1.0f64);
one_impl!(f32, 1.0);
one_impl!(f64, 1.0);
impl<T: One> One for Wrapping<T> where Wrapping<T>: Mul<Output=Wrapping<T>> {
fn one() -> Self {

4
src/int.rs
View File

@ -368,9 +368,13 @@ prim_int_impl!(u8, i8, u8);
prim_int_impl!(u16, i16, u16);
prim_int_impl!(u32, i32, u32);
prim_int_impl!(u64, i64, u64);
#[cfg(feature = "i128")]
prim_int_impl!(u128, i128, u128);
prim_int_impl!(usize, isize, usize);
prim_int_impl!(i8, i8, u8);
prim_int_impl!(i16, i16, u16);
prim_int_impl!(i32, i32, u32);
prim_int_impl!(i64, i64, u64);
#[cfg(feature = "i128")]
prim_int_impl!(i128, i128, u128);
prim_int_impl!(isize, isize, usize);

2
src/lib.rs
View File

@ -160,6 +160,8 @@ macro_rules! int_trait_impl {
)*)
}
int_trait_impl!(Num for usize u8 u16 u32 u64 isize i8 i16 i32 i64);
#[cfg(feature = "i128")]
int_trait_impl!(Num for u128 i128);
impl<T: Num> Num for Wrapping<T>
where Wrapping<T>:

32
src/ops/checked.rs
View File

@ -24,12 +24,16 @@ checked_impl!(CheckedAdd, checked_add, u16);
checked_impl!(CheckedAdd, checked_add, u32);
checked_impl!(CheckedAdd, checked_add, u64);
checked_impl!(CheckedAdd, checked_add, usize);
#[cfg(feature = "i128")]
checked_impl!(CheckedAdd, checked_add, u128);
checked_impl!(CheckedAdd, checked_add, i8);
checked_impl!(CheckedAdd, checked_add, i16);
checked_impl!(CheckedAdd, checked_add, i32);
checked_impl!(CheckedAdd, checked_add, i64);
checked_impl!(CheckedAdd, checked_add, isize);
#[cfg(feature = "i128")]
checked_impl!(CheckedAdd, checked_add, i128);
/// Performs subtraction that returns `None` instead of wrapping around on underflow.
pub trait CheckedSub: Sized + Sub<Self, Output=Self> {
@ -43,12 +47,16 @@ checked_impl!(CheckedSub, checked_sub, u16);
checked_impl!(CheckedSub, checked_sub, u32);
checked_impl!(CheckedSub, checked_sub, u64);
checked_impl!(CheckedSub, checked_sub, usize);
#[cfg(feature = "i128")]
checked_impl!(CheckedSub, checked_sub, u128);
checked_impl!(CheckedSub, checked_sub, i8);
checked_impl!(CheckedSub, checked_sub, i16);
checked_impl!(CheckedSub, checked_sub, i32);
checked_impl!(CheckedSub, checked_sub, i64);
checked_impl!(CheckedSub, checked_sub, isize);
#[cfg(feature = "i128")]
checked_impl!(CheckedSub, checked_sub, i128);
/// Performs multiplication that returns `None` instead of wrapping around on underflow or
/// overflow.
@ -63,12 +71,16 @@ checked_impl!(CheckedMul, checked_mul, u16);
checked_impl!(CheckedMul, checked_mul, u32);
checked_impl!(CheckedMul, checked_mul, u64);
checked_impl!(CheckedMul, checked_mul, usize);
#[cfg(feature = "i128")]
checked_impl!(CheckedMul, checked_mul, u128);
checked_impl!(CheckedMul, checked_mul, i8);
checked_impl!(CheckedMul, checked_mul, i16);
checked_impl!(CheckedMul, checked_mul, i32);
checked_impl!(CheckedMul, checked_mul, i64);
checked_impl!(CheckedMul, checked_mul, isize);
#[cfg(feature = "i128")]
checked_impl!(CheckedMul, checked_mul, i128);
/// Performs division that returns `None` instead of panicking on division by zero and instead of
/// wrapping around on underflow and overflow.
@ -83,12 +95,16 @@ checked_impl!(CheckedDiv, checked_div, u16);
checked_impl!(CheckedDiv, checked_div, u32);
checked_impl!(CheckedDiv, checked_div, u64);
checked_impl!(CheckedDiv, checked_div, usize);
#[cfg(feature = "i128")]
checked_impl!(CheckedDiv, checked_div, u128);
checked_impl!(CheckedDiv, checked_div, i8);
checked_impl!(CheckedDiv, checked_div, i16);
checked_impl!(CheckedDiv, checked_div, i32);
checked_impl!(CheckedDiv, checked_div, i64);
checked_impl!(CheckedDiv, checked_div, isize);
#[cfg(feature = "i128")]
checked_impl!(CheckedDiv, checked_div, i128);
/// Performs an integral remainder that returns `None` instead of panicking on division by zero and
/// instead of wrapping around on underflow and overflow.
@ -120,12 +136,16 @@ checked_impl!(CheckedRem, checked_rem, u16);
checked_impl!(CheckedRem, checked_rem, u32);
checked_impl!(CheckedRem, checked_rem, u64);
checked_impl!(CheckedRem, checked_rem, usize);
#[cfg(feature = "i128")]
checked_impl!(CheckedRem, checked_rem, u128);
checked_impl!(CheckedRem, checked_rem, i8);
checked_impl!(CheckedRem, checked_rem, i16);
checked_impl!(CheckedRem, checked_rem, i32);
checked_impl!(CheckedRem, checked_rem, i64);
checked_impl!(CheckedRem, checked_rem, isize);
#[cfg(feature = "i128")]
checked_impl!(CheckedRem, checked_rem, i128);
macro_rules! checked_impl_unary {
($trait_name:ident, $method:ident, $t:ty) => {
@ -164,12 +184,16 @@ checked_impl_unary!(CheckedNeg, checked_neg, u16);
checked_impl_unary!(CheckedNeg, checked_neg, u32);
checked_impl_unary!(CheckedNeg, checked_neg, u64);
checked_impl_unary!(CheckedNeg, checked_neg, usize);
#[cfg(feature = "i128")]
checked_impl_unary!(CheckedNeg, checked_neg, u128);
checked_impl_unary!(CheckedNeg, checked_neg, i8);
checked_impl_unary!(CheckedNeg, checked_neg, i16);
checked_impl_unary!(CheckedNeg, checked_neg, i32);
checked_impl_unary!(CheckedNeg, checked_neg, i64);
checked_impl_unary!(CheckedNeg, checked_neg, isize);
#[cfg(feature = "i128")]
checked_impl_unary!(CheckedNeg, checked_neg, i128);
/// Performs a left shift that returns `None` on overflow.
pub trait CheckedShl: Sized + Shl<u32, Output=Self> {
@ -205,12 +229,16 @@ checked_shift_impl!(CheckedShl, checked_shl, u16);
checked_shift_impl!(CheckedShl, checked_shl, u32);
checked_shift_impl!(CheckedShl, checked_shl, u64);
checked_shift_impl!(CheckedShl, checked_shl, usize);
#[cfg(feature = "i128")]
checked_shift_impl!(CheckedShl, checked_shl, u128);
checked_shift_impl!(CheckedShl, checked_shl, i8);
checked_shift_impl!(CheckedShl, checked_shl, i16);
checked_shift_impl!(CheckedShl, checked_shl, i32);
checked_shift_impl!(CheckedShl, checked_shl, i64);
checked_shift_impl!(CheckedShl, checked_shl, isize);
#[cfg(feature = "i128")]
checked_shift_impl!(CheckedShl, checked_shl, i128);
/// Performs a right shift that returns `None` on overflow.
pub trait CheckedShr: Sized + Shr<u32, Output=Self> {
@ -235,9 +263,13 @@ checked_shift_impl!(CheckedShr, checked_shr, u16);
checked_shift_impl!(CheckedShr, checked_shr, u32);
checked_shift_impl!(CheckedShr, checked_shr, u64);
checked_shift_impl!(CheckedShr, checked_shr, usize);
#[cfg(feature = "i128")]
checked_shift_impl!(CheckedShr, checked_shr, u128);
checked_shift_impl!(CheckedShr, checked_shr, i8);
checked_shift_impl!(CheckedShr, checked_shr, i16);
checked_shift_impl!(CheckedShr, checked_shr, i32);
checked_shift_impl!(CheckedShr, checked_shr, i64);
checked_shift_impl!(CheckedShr, checked_shr, isize);
#[cfg(feature = "i128")]
checked_shift_impl!(CheckedShr, checked_shr, i128);

4
src/ops/mul_add.rs
View File

@ -67,6 +67,8 @@ macro_rules! mul_add_impl {
}
mul_add_impl!(MulAdd for isize usize i8 u8 i16 u16 i32 u32 i64 u64);
#[cfg(feature = "i128")]
mul_add_impl!(MulAdd for i128 u128);
#[cfg(feature = "std")]
impl MulAddAssign<f32, f32> for f32 {
@ -96,6 +98,8 @@ macro_rules! mul_add_assign_impl {
}
mul_add_assign_impl!(MulAddAssign for isize usize i8 u8 i16 u16 i32 u32 i64 u64);
#[cfg(feature = "i128")]
mul_add_assign_impl!(MulAddAssign for i128 u128);
#[cfg(test)]
mod tests {

2
src/ops/saturating.rs
View File

@ -26,3 +26,5 @@ macro_rules! saturating_impl {
}
saturating_impl!(Saturating for isize usize i8 u8 i16 u16 i32 u32 i64 u64);
#[cfg(feature = "i128")]
saturating_impl!(Saturating for i128 u128);

12
src/ops/wrapping.rs
View File

@ -32,12 +32,16 @@ wrapping_impl!(WrappingAdd, wrapping_add, u16);
wrapping_impl!(WrappingAdd, wrapping_add, u32);
wrapping_impl!(WrappingAdd, wrapping_add, u64);
wrapping_impl!(WrappingAdd, wrapping_add, usize);
#[cfg(feature = "i128")]
wrapping_impl!(WrappingAdd, wrapping_add, u128);
wrapping_impl!(WrappingAdd, wrapping_add, i8);
wrapping_impl!(WrappingAdd, wrapping_add, i16);
wrapping_impl!(WrappingAdd, wrapping_add, i32);
wrapping_impl!(WrappingAdd, wrapping_add, i64);
wrapping_impl!(WrappingAdd, wrapping_add, isize);
#[cfg(feature = "i128")]
wrapping_impl!(WrappingAdd, wrapping_add, i128);
/// Performs subtraction that wraps around on overflow.
pub trait WrappingSub: Sized + Sub<Self, Output=Self> {
@ -51,12 +55,16 @@ wrapping_impl!(WrappingSub, wrapping_sub, u16);
wrapping_impl!(WrappingSub, wrapping_sub, u32);
wrapping_impl!(WrappingSub, wrapping_sub, u64);
wrapping_impl!(WrappingSub, wrapping_sub, usize);
#[cfg(feature = "i128")]
wrapping_impl!(WrappingSub, wrapping_sub, u128);
wrapping_impl!(WrappingSub, wrapping_sub, i8);
wrapping_impl!(WrappingSub, wrapping_sub, i16);
wrapping_impl!(WrappingSub, wrapping_sub, i32);
wrapping_impl!(WrappingSub, wrapping_sub, i64);
wrapping_impl!(WrappingSub, wrapping_sub, isize);
#[cfg(feature = "i128")]
wrapping_impl!(WrappingSub, wrapping_sub, i128);
/// Performs multiplication that wraps around on overflow.
pub trait WrappingMul: Sized + Mul<Self, Output=Self> {
@ -70,12 +78,16 @@ wrapping_impl!(WrappingMul, wrapping_mul, u16);
wrapping_impl!(WrappingMul, wrapping_mul, u32);
wrapping_impl!(WrappingMul, wrapping_mul, u64);
wrapping_impl!(WrappingMul, wrapping_mul, usize);
#[cfg(feature = "i128")]
wrapping_impl!(WrappingMul, wrapping_mul, u128);
wrapping_impl!(WrappingMul, wrapping_mul, i8);
wrapping_impl!(WrappingMul, wrapping_mul, i16);
wrapping_impl!(WrappingMul, wrapping_mul, i32);
wrapping_impl!(WrappingMul, wrapping_mul, i64);
wrapping_impl!(WrappingMul, wrapping_mul, isize);
#[cfg(feature = "i128")]
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>> {

23
src/pow.rs
View File

@ -98,6 +98,25 @@ pow_impl!(i64, u8, u32, i64::pow);
pow_impl!(i64, u16, u32, i64::pow);
pow_impl!(i64, u32, u32, i64::pow);
pow_impl!(i64, usize);
#[cfg(feature = "i128")]
pow_impl!(u128, u8, u32, u128::pow);
#[cfg(feature = "i128")]
pow_impl!(u128, u16, u32, u128::pow);
#[cfg(feature = "i128")]
pow_impl!(u128, u32, u32, u128::pow);
#[cfg(feature = "i128")]
pow_impl!(u128, usize);
#[cfg(feature = "i128")]
pow_impl!(i128, u8, u32, i128::pow);
#[cfg(feature = "i128")]
pow_impl!(i128, u16, u32, i128::pow);
#[cfg(feature = "i128")]
pow_impl!(i128, u32, u32, i128::pow);
#[cfg(feature = "i128")]
pow_impl!(i128, usize);
pow_impl!(usize, u8, u32, usize::pow);
pow_impl!(usize, u16, u32, usize::pow);
pow_impl!(usize, u32, u32, usize::pow);
@ -114,6 +133,10 @@ pow_impl!(Wrapping<u32>);
pow_impl!(Wrapping<i32>);
pow_impl!(Wrapping<u64>);
pow_impl!(Wrapping<i64>);
#[cfg(feature = "i128")]
pow_impl!(Wrapping<u128>);
#[cfg(feature = "i128")]
pow_impl!(Wrapping<i128>);
pow_impl!(Wrapping<usize>);
pow_impl!(Wrapping<isize>);

5
src/sign.rs
View File

@ -74,6 +74,9 @@ macro_rules! signed_impl {
signed_impl!(isize i8 i16 i32 i64);
#[cfg(feature = "i128")]
signed_impl!(i128);
impl<T: Signed> Signed for Wrapping<T> where Wrapping<T>: Num + Neg<Output=Wrapping<T>>
{
#[inline]
@ -183,6 +186,8 @@ macro_rules! empty_trait_impl {
}
empty_trait_impl!(Unsigned for usize u8 u16 u32 u64);
#[cfg(feature = "i128")]
empty_trait_impl!(Unsigned for u128);
impl<T: Unsigned> Unsigned for Wrapping<T> where Wrapping<T>: Num {}

319
tests/cast.rs Normal file
View File

@ -0,0 +1,319 @@
//! Tests of `num_traits::cast`.
#![no_std]
#[cfg(feature = "std")]
#[macro_use]
extern crate std;
extern crate num_traits;
use num_traits::cast::*;
use core::{i8, i16, i32, i64, isize};
use core::{u8, u16, u32, u64, usize};
use core::{f32, f64};
#[cfg(feature = "i128")]
use core::{i128, u128};
use core::mem;
use core::num::Wrapping;
#[test]
fn to_primitive_float() {
let f32_toolarge = 1e39f64;
assert_eq!(f32_toolarge.to_f32(), None);
assert_eq!((f32::MAX as f64).to_f32(), Some(f32::MAX));
assert_eq!((-f32::MAX as f64).to_f32(), Some(-f32::MAX));
assert_eq!(f64::INFINITY.to_f32(), Some(f32::INFINITY));
assert_eq!((f64::NEG_INFINITY).to_f32(), Some(f32::NEG_INFINITY));
assert!((f64::NAN).to_f32().map_or(false, |f| f.is_nan()));
}
#[test]
fn wrapping_to_primitive() {
macro_rules! test_wrapping_to_primitive {
($($t:ty)+) => {
$({
let i: $t = 0;
let w = Wrapping(i);
assert_eq!(i.to_u8(), w.to_u8());
assert_eq!(i.to_u16(), w.to_u16());
assert_eq!(i.to_u32(), w.to_u32());
assert_eq!(i.to_u64(), w.to_u64());
assert_eq!(i.to_usize(), w.to_usize());
assert_eq!(i.to_i8(), w.to_i8());
assert_eq!(i.to_i16(), w.to_i16());
assert_eq!(i.to_i32(), w.to_i32());
assert_eq!(i.to_i64(), w.to_i64());
assert_eq!(i.to_isize(), w.to_isize());
assert_eq!(i.to_f32(), w.to_f32());
assert_eq!(i.to_f64(), w.to_f64());
})+
};
}
test_wrapping_to_primitive!(usize u8 u16 u32 u64 isize i8 i16 i32 i64);
}
#[test]
fn wrapping_is_toprimitive() {
fn require_toprimitive<T: ToPrimitive>(_: &T) {}
require_toprimitive(&Wrapping(42));
}
#[test]
fn wrapping_is_fromprimitive() {
fn require_fromprimitive<T: FromPrimitive>(_: &T) {}
require_fromprimitive(&Wrapping(42));
}
#[test]
fn wrapping_is_numcast() {
fn require_numcast<T: NumCast>(_: &T) {}
require_numcast(&Wrapping(42));
}
#[test]
fn as_primitive() {
let x: f32 = (1.625f64).as_();
assert_eq!(x, 1.625f32);
let x: f32 = (3.14159265358979323846f64).as_();
assert_eq!(x, 3.1415927f32);
let x: u8 = (768i16).as_();
assert_eq!(x, 0);
}
#[test]
fn float_to_integer_checks_overflow() {
// This will overflow an i32
let source: f64 = 1.0e+123f64;
// Expect the overflow to be caught
assert_eq!(cast::<f64, i32>(source), None);
}
#[test]
fn cast_to_int_checks_overflow() {
let big_f: f64 = 1.0e123;
let normal_f: f64 = 1.0;
let small_f: f64 = -1.0e123;
assert_eq!(None, cast::<f64, isize>(big_f));
assert_eq!(None, cast::<f64, i8>(big_f));
assert_eq!(None, cast::<f64, i16>(big_f));
assert_eq!(None, cast::<f64, i32>(big_f));
assert_eq!(None, cast::<f64, i64>(big_f));
assert_eq!(Some(normal_f as isize), cast::<f64, isize>(normal_f));
assert_eq!(Some(normal_f as i8), cast::<f64, i8>(normal_f));
assert_eq!(Some(normal_f as i16), cast::<f64, i16>(normal_f));
assert_eq!(Some(normal_f as i32), cast::<f64, i32>(normal_f));
assert_eq!(Some(normal_f as i64), cast::<f64, i64>(normal_f));
assert_eq!(None, cast::<f64, isize>(small_f));
assert_eq!(None, cast::<f64, i8>(small_f));
assert_eq!(None, cast::<f64, i16>(small_f));
assert_eq!(None, cast::<f64, i32>(small_f));
assert_eq!(None, cast::<f64, i64>(small_f));
}
#[test]
fn cast_to_unsigned_int_checks_overflow() {
let big_f: f64 = 1.0e123;
let normal_f: f64 = 1.0;
let small_f: f64 = -1.0e123;
assert_eq!(None, cast::<f64, usize>(big_f));
assert_eq!(None, cast::<f64, u8>(big_f));
assert_eq!(None, cast::<f64, u16>(big_f));
assert_eq!(None, cast::<f64, u32>(big_f));
assert_eq!(None, cast::<f64, u64>(big_f));
assert_eq!(Some(normal_f as usize), cast::<f64, usize>(normal_f));
assert_eq!(Some(normal_f as u8), cast::<f64, u8>(normal_f));
assert_eq!(Some(normal_f as u16), cast::<f64, u16>(normal_f));
assert_eq!(Some(normal_f as u32), cast::<f64, u32>(normal_f));
assert_eq!(Some(normal_f as u64), cast::<f64, u64>(normal_f));
assert_eq!(None, cast::<f64, usize>(small_f));
assert_eq!(None, cast::<f64, u8>(small_f));
assert_eq!(None, cast::<f64, u16>(small_f));
assert_eq!(None, cast::<f64, u32>(small_f));
assert_eq!(None, cast::<f64, u64>(small_f));
}
#[test]
#[cfg(feature = "i128")]
fn cast_to_i128_checks_overflow() {
let big_f: f64 = 1.0e123;
let normal_f: f64 = 1.0;
let small_f: f64 = -1.0e123;
assert_eq!(None, cast::<f64, i128>(big_f));
assert_eq!(None, cast::<f64, u128>(big_f));
assert_eq!(Some(normal_f as i128), cast::<f64, i128>(normal_f));
assert_eq!(Some(normal_f as u128), cast::<f64, u128>(normal_f));
assert_eq!(None, cast::<f64, i128>(small_f));
assert_eq!(None, cast::<f64, u128>(small_f));
}
#[cfg(feature = "std")]
fn dbg(args: ::core::fmt::Arguments) {
println!("{}", args);
}
#[cfg(not(feature = "std"))]
fn dbg(_: ::core::fmt::Arguments) {}
// Rust 1.8 doesn't handle cfg on macros correctly
macro_rules! dbg { ($($tok:tt)*) => { dbg(format_args!($($tok)*)) } }
macro_rules! float_test_edge {
($f:ident -> $($t:ident)+) => { $({
dbg!("testing cast edge cases for {} -> {}", stringify!($f), stringify!($t));
let small = if $t::MIN == 0 || mem::size_of::<$t>() < mem::size_of::<$f>() {
$t::MIN as $f - 1.0
} else {
($t::MIN as $f).raw_offset(1).floor()
};
let fmin = small.raw_offset(-1);
dbg!(" testing min {}\n\tvs. {:.0}\n\tand {:.0}", $t::MIN, fmin, small);
assert_eq!(Some($t::MIN), cast::<$f, $t>($t::MIN as $f));
assert_eq!(Some($t::MIN), cast::<$f, $t>(fmin));
assert_eq!(None, cast::<$f, $t>(small));
let (max, large) = if mem::size_of::<$t>() < mem::size_of::<$f>() {
($t::MAX, $t::MAX as $f + 1.0)
} else {
let large = $t::MAX as $f; // rounds up!
let max = large.raw_offset(-1) as $t; // the next smallest possible
assert_eq!(max.count_ones(), $f::MANTISSA_DIGITS);
(max, large)
};
let fmax = large.raw_offset(-1);
dbg!(" testing max {}\n\tvs. {:.0}\n\tand {:.0}", max, fmax, large);
assert_eq!(Some(max), cast::<$f, $t>(max as $f));
assert_eq!(Some(max), cast::<$f, $t>(fmax));
assert_eq!(None, cast::<$f, $t>(large));
dbg!(" testing non-finite values");
assert_eq!(None, cast::<$f, $t>($f::NAN));
assert_eq!(None, cast::<$f, $t>($f::INFINITY));
assert_eq!(None, cast::<$f, $t>($f::NEG_INFINITY));
})+}
}
trait RawOffset: Sized {
type Raw;
fn raw_offset(self, offset: Self::Raw) -> Self;
}
impl RawOffset for f32 {
type Raw = i32;
fn raw_offset(self, offset: Self::Raw) -> Self {
unsafe {
let raw: Self::Raw = mem::transmute(self);
mem::transmute(raw + offset)
}
}
}
impl RawOffset for f64 {
type Raw = i64;
fn raw_offset(self, offset: Self::Raw) -> Self {
unsafe {
let raw: Self::Raw = mem::transmute(self);
mem::transmute(raw + offset)
}
}
}
#[test]
fn cast_float_to_int_edge_cases() {
float_test_edge!(f32 -> isize i8 i16 i32 i64);
float_test_edge!(f32 -> usize u8 u16 u32 u64);
float_test_edge!(f64 -> isize i8 i16 i32 i64);
float_test_edge!(f64 -> usize u8 u16 u32 u64);
}
#[test]
#[cfg(feature = "i128")]
fn cast_float_to_i128_edge_cases() {
float_test_edge!(f32 -> i128 u128);
float_test_edge!(f64 -> i128 u128);
}
macro_rules! int_test_edge {
($f:ident -> { $($t:ident)+ } with $BigS:ident $BigU:ident ) => { $({
fn test_edge() {
dbg!("testing cast edge cases for {} -> {}", stringify!($f), stringify!($t));
match ($f::MIN as $BigS).cmp(&($t::MIN as $BigS)) {
Greater => {
assert_eq!(Some($f::MIN as $t), cast::<$f, $t>($f::MIN));
}
Equal => {
assert_eq!(Some($t::MIN), cast::<$f, $t>($f::MIN));
}
Less => {
let min = $t::MIN as $f;
assert_eq!(Some($t::MIN), cast::<$f, $t>(min));
assert_eq!(None, cast::<$f, $t>(min - 1));
}
}
match ($f::MAX as $BigU).cmp(&($t::MAX as $BigU)) {
Greater => {
let max = $t::MAX as $f;
assert_eq!(Some($t::MAX), cast::<$f, $t>(max));
assert_eq!(None, cast::<$f, $t>(max + 1));
}
Equal => {
assert_eq!(Some($t::MAX), cast::<$f, $t>($f::MAX));
}
Less => {
assert_eq!(Some($f::MAX as $t), cast::<$f, $t>($f::MAX));
}
}
}
test_edge();
})+}
}
#[test]
fn cast_int_to_int_edge_cases() {
use core::cmp::Ordering::*;
macro_rules! test_edge {
($( $from:ident )+) => { $({
int_test_edge!($from -> { isize i8 i16 i32 i64 } with i64 u64);
int_test_edge!($from -> { usize u8 u16 u32 u64 } with i64 u64);
})+}
}
test_edge!(isize i8 i16 i32 i64);
test_edge!(usize u8 u16 u32 u64);
}
#[test]
#[cfg(feature = "i128")]
fn cast_int_to_128_edge_cases() {
use core::cmp::Ordering::*;
macro_rules! test_edge {
($( $t:ident )+) => {
$(
int_test_edge!($t -> { i128 u128 } with i128 u128);
)+
int_test_edge!(i128 -> { $( $t )+ } with i128 u128);
int_test_edge!(u128 -> { $( $t )+ } with i128 u128);
}
}
test_edge!(isize i8 i16 i32 i64 i128);
test_edge!(usize u8 u16 u32 u64 u128);
}