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Moved checked trait impls out of std::num

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This follows the same pattern as the other numeric trait impls, and reduces the clutter in std::num.
This commit is contained in:
Brendan Zabarauskas 2013-09-07 17:15:35 +10:00
parent 5591dce52e
commit 0fcb85997d
11 changed files with 411 additions and 383 deletions
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33
src/libstd/num/i16.rs
View File

@ -10,7 +10,8 @@
//! Operations and constants for `i16`
use num::BitCount;
use num::{BitCount, CheckedAdd, CheckedSub, CheckedMul};
use option::{Option, Some, None};
use unstable::intrinsics;
pub use self::generated::*;
@ -30,3 +31,33 @@ fn leading_zeros(&self) -> i16 { unsafe { intrinsics::ctlz16(*self) } }
#[inline]
fn trailing_zeros(&self) -> i16 { unsafe { intrinsics::cttz16(*self) } }
}
impl CheckedAdd for i16 {
#[inline]
fn checked_add(&self, v: &i16) -> Option<i16> {
unsafe {
let (x, y) = intrinsics::i16_add_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
impl CheckedSub for i16 {
#[inline]
fn checked_sub(&self, v: &i16) -> Option<i16> {
unsafe {
let (x, y) = intrinsics::i16_sub_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
impl CheckedMul for i16 {
#[inline]
fn checked_mul(&self, v: &i16) -> Option<i16> {
unsafe {
let (x, y) = intrinsics::i16_mul_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}

33
src/libstd/num/i32.rs
View File

@ -10,7 +10,8 @@
//! Operations and constants for `i32`
use num::BitCount;
use num::{BitCount, CheckedAdd, CheckedSub, CheckedMul};
use option::{Option, Some, None};
use unstable::intrinsics;
pub use self::generated::*;
@ -30,3 +31,33 @@ fn leading_zeros(&self) -> i32 { unsafe { intrinsics::ctlz32(*self) } }
#[inline]
fn trailing_zeros(&self) -> i32 { unsafe { intrinsics::cttz32(*self) } }
}
impl CheckedAdd for i32 {
#[inline]
fn checked_add(&self, v: &i32) -> Option<i32> {
unsafe {
let (x, y) = intrinsics::i32_add_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
impl CheckedSub for i32 {
#[inline]
fn checked_sub(&self, v: &i32) -> Option<i32> {
unsafe {
let (x, y) = intrinsics::i32_sub_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
impl CheckedMul for i32 {
#[inline]
fn checked_mul(&self, v: &i32) -> Option<i32> {
unsafe {
let (x, y) = intrinsics::i32_mul_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}

35
src/libstd/num/i64.rs
View File

@ -10,7 +10,8 @@
//! Operations and constants for `i64`
use num::BitCount;
use num::{BitCount, CheckedAdd, CheckedSub, CheckedMul};
use option::{Option, Some, None};
use unstable::intrinsics;
pub use self::generated::*;
@ -30,3 +31,35 @@ fn leading_zeros(&self) -> i64 { unsafe { intrinsics::ctlz64(*self) } }
#[inline]
fn trailing_zeros(&self) -> i64 { unsafe { intrinsics::cttz64(*self) } }
}
impl CheckedAdd for i64 {
#[inline]
fn checked_add(&self, v: &i64) -> Option<i64> {
unsafe {
let (x, y) = intrinsics::i64_add_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
impl CheckedSub for i64 {
#[inline]
fn checked_sub(&self, v: &i64) -> Option<i64> {
unsafe {
let (x, y) = intrinsics::i64_sub_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
// FIXME: #8449: should not be disabled on 32-bit
#[cfg(target_word_size = "64")]
impl CheckedMul for i64 {
#[inline]
fn checked_mul(&self, v: &i64) -> Option<i64> {
unsafe {
let (x, y) = intrinsics::i64_mul_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}

33
src/libstd/num/i8.rs
View File

@ -10,7 +10,8 @@
//! Operations and constants for `i8`
use num::BitCount;
use num::{BitCount, CheckedAdd, CheckedSub, CheckedMul};
use option::{Option, Some, None};
use unstable::intrinsics;
pub use self::generated::*;
@ -30,3 +31,33 @@ fn leading_zeros(&self) -> i8 { unsafe { intrinsics::ctlz8(*self) } }
#[inline]
fn trailing_zeros(&self) -> i8 { unsafe { intrinsics::cttz8(*self) } }
}
impl CheckedAdd for i8 {
#[inline]
fn checked_add(&self, v: &i8) -> Option<i8> {
unsafe {
let (x, y) = intrinsics::i8_add_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
impl CheckedSub for i8 {
#[inline]
fn checked_sub(&self, v: &i8) -> Option<i8> {
unsafe {
let (x, y) = intrinsics::i8_sub_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
impl CheckedMul for i8 {
#[inline]
fn checked_mul(&self, v: &i8) -> Option<i8> {
unsafe {
let (x, y) = intrinsics::i8_mul_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}

70
src/libstd/num/int.rs
View File

@ -12,7 +12,9 @@
#[allow(non_uppercase_statics)];
use num::BitCount;
use num::{BitCount, CheckedAdd, CheckedSub, CheckedMul};
use option::{Option, Some, None};
use unstable::intrinsics;
pub use self::generated::*;
@ -51,6 +53,72 @@ fn leading_zeros(&self) -> int { (*self as i64).leading_zeros() as int }
fn trailing_zeros(&self) -> int { (*self as i64).trailing_zeros() as int }
}
#[cfg(target_word_size = "32")]
impl CheckedAdd for int {
#[inline]
fn checked_add(&self, v: &int) -> Option<int> {
unsafe {
let (x, y) = intrinsics::i32_add_with_overflow(*self as i32, *v as i32);
if y { None } else { Some(x as int) }
}
}
}
#[cfg(target_word_size = "64")]
impl CheckedAdd for int {
#[inline]
fn checked_add(&self, v: &int) -> Option<int> {
unsafe {
let (x, y) = intrinsics::i64_add_with_overflow(*self as i64, *v as i64);
if y { None } else { Some(x as int) }
}
}
}
#[cfg(target_word_size = "32")]
impl CheckedSub for int {
#[inline]
fn checked_sub(&self, v: &int) -> Option<int> {
unsafe {
let (x, y) = intrinsics::i32_sub_with_overflow(*self as i32, *v as i32);
if y { None } else { Some(x as int) }
}
}
}
#[cfg(target_word_size = "64")]
impl CheckedSub for int {
#[inline]
fn checked_sub(&self, v: &int) -> Option<int> {
unsafe {
let (x, y) = intrinsics::i64_sub_with_overflow(*self as i64, *v as i64);
if y { None } else { Some(x as int) }
}
}
}
#[cfg(target_word_size = "32")]
impl CheckedMul for int {
#[inline]
fn checked_mul(&self, v: &int) -> Option<int> {
unsafe {
let (x, y) = intrinsics::i32_mul_with_overflow(*self as i32, *v as i32);
if y { None } else { Some(x as int) }
}
}
}
#[cfg(target_word_size = "64")]
impl CheckedMul for int {
#[inline]
fn checked_mul(&self, v: &int) -> Option<int> {
unsafe {
let (x, y) = intrinsics::i64_mul_with_overflow(*self as i64, *v as i64);
if y { None } else { Some(x as int) }
}
}
}
/// Returns `base` raised to the power of `exponent`
pub fn pow(base: int, exponent: uint) -> int {
if exponent == 0u {

379
src/libstd/num/num.rs
View File

@ -19,7 +19,6 @@
use ops::{Add, Sub, Mul, Div, Rem, Neg};
use ops::{Not, BitAnd, BitOr, BitXor, Shl, Shr};
use option::{Option, Some, None};
use unstable::intrinsics;
pub mod strconv;
@ -493,7 +492,7 @@ pub trait Saturating {
fn saturating_sub(self, v: Self) -> Self;
}
impl<T: CheckedAdd+CheckedSub+Zero+Ord+Bounded> Saturating for T {
impl<T: CheckedAdd + CheckedSub + Zero + Ord + Bounded> Saturating for T {
#[inline]
fn saturating_add(self, v: T) -> T {
match self.checked_add(&v) {
@ -523,390 +522,14 @@ pub trait CheckedAdd: Add<Self, Self> {
fn checked_add(&self, v: &Self) -> Option<Self>;
}
impl CheckedAdd for i8 {
#[inline]
fn checked_add(&self, v: &i8) -> Option<i8> {
unsafe {
let (x, y) = intrinsics::i8_add_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
impl CheckedAdd for i16 {
#[inline]
fn checked_add(&self, v: &i16) -> Option<i16> {
unsafe {
let (x, y) = intrinsics::i16_add_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
impl CheckedAdd for i32 {
#[inline]
fn checked_add(&self, v: &i32) -> Option<i32> {
unsafe {
let (x, y) = intrinsics::i32_add_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
impl CheckedAdd for i64 {
#[inline]
fn checked_add(&self, v: &i64) -> Option<i64> {
unsafe {
let (x, y) = intrinsics::i64_add_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
#[cfg(target_word_size = "32")]
impl CheckedAdd for int {
#[inline]
fn checked_add(&self, v: &int) -> Option<int> {
unsafe {
let (x, y) = intrinsics::i32_add_with_overflow(*self as i32, *v as i32);
if y { None } else { Some(x as int) }
}
}
}
#[cfg(target_word_size = "64")]
impl CheckedAdd for int {
#[inline]
fn checked_add(&self, v: &int) -> Option<int> {
unsafe {
let (x, y) = intrinsics::i64_add_with_overflow(*self as i64, *v as i64);
if y { None } else { Some(x as int) }
}
}
}
impl CheckedAdd for u8 {
#[inline]
fn checked_add(&self, v: &u8) -> Option<u8> {
unsafe {
let (x, y) = intrinsics::u8_add_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
impl CheckedAdd for u16 {
#[inline]
fn checked_add(&self, v: &u16) -> Option<u16> {
unsafe {
let (x, y) = intrinsics::u16_add_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
impl CheckedAdd for u32 {
#[inline]
fn checked_add(&self, v: &u32) -> Option<u32> {
unsafe {
let (x, y) = intrinsics::u32_add_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
impl CheckedAdd for u64 {
#[inline]
fn checked_add(&self, v: &u64) -> Option<u64> {
unsafe {
let (x, y) = intrinsics::u64_add_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
#[cfg(target_word_size = "32")]
impl CheckedAdd for uint {
#[inline]
fn checked_add(&self, v: &uint) -> Option<uint> {
unsafe {
let (x, y) = intrinsics::u32_add_with_overflow(*self as u32, *v as u32);
if y { None } else { Some(x as uint) }
}
}
}
#[cfg(target_word_size = "64")]
impl CheckedAdd for uint {
#[inline]
fn checked_add(&self, v: &uint) -> Option<uint> {
unsafe {
let (x, y) = intrinsics::u64_add_with_overflow(*self as u64, *v as u64);
if y { None } else { Some(x as uint) }
}
}
}
pub trait CheckedSub: Sub<Self, Self> {
fn checked_sub(&self, v: &Self) -> Option<Self>;
}
impl CheckedSub for i8 {
#[inline]
fn checked_sub(&self, v: &i8) -> Option<i8> {
unsafe {
let (x, y) = intrinsics::i8_sub_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
impl CheckedSub for i16 {
#[inline]
fn checked_sub(&self, v: &i16) -> Option<i16> {
unsafe {
let (x, y) = intrinsics::i16_sub_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
impl CheckedSub for i32 {
#[inline]
fn checked_sub(&self, v: &i32) -> Option<i32> {
unsafe {
let (x, y) = intrinsics::i32_sub_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
impl CheckedSub for i64 {
#[inline]
fn checked_sub(&self, v: &i64) -> Option<i64> {
unsafe {
let (x, y) = intrinsics::i64_sub_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
#[cfg(target_word_size = "32")]
impl CheckedSub for int {
#[inline]
fn checked_sub(&self, v: &int) -> Option<int> {
unsafe {
let (x, y) = intrinsics::i32_sub_with_overflow(*self as i32, *v as i32);
if y { None } else { Some(x as int) }
}
}
}
#[cfg(target_word_size = "64")]
impl CheckedSub for int {
#[inline]
fn checked_sub(&self, v: &int) -> Option<int> {
unsafe {
let (x, y) = intrinsics::i64_sub_with_overflow(*self as i64, *v as i64);
if y { None } else { Some(x as int) }
}
}
}
impl CheckedSub for u8 {
#[inline]
fn checked_sub(&self, v: &u8) -> Option<u8> {
unsafe {
let (x, y) = intrinsics::u8_sub_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
impl CheckedSub for u16 {
#[inline]
fn checked_sub(&self, v: &u16) -> Option<u16> {
unsafe {
let (x, y) = intrinsics::u16_sub_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
impl CheckedSub for u32 {
#[inline]
fn checked_sub(&self, v: &u32) -> Option<u32> {
unsafe {
let (x, y) = intrinsics::u32_sub_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
impl CheckedSub for u64 {
#[inline]
fn checked_sub(&self, v: &u64) -> Option<u64> {
unsafe {
let (x, y) = intrinsics::u64_sub_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
#[cfg(target_word_size = "32")]
impl CheckedSub for uint {
#[inline]
fn checked_sub(&self, v: &uint) -> Option<uint> {
unsafe {
let (x, y) = intrinsics::u32_sub_with_overflow(*self as u32, *v as u32);
if y { None } else { Some(x as uint) }
}
}
}
#[cfg(target_word_size = "64")]
impl CheckedSub for uint {
#[inline]
fn checked_sub(&self, v: &uint) -> Option<uint> {
unsafe {
let (x, y) = intrinsics::u64_sub_with_overflow(*self as u64, *v as u64);
if y { None } else { Some(x as uint) }
}
}
}
pub trait CheckedMul: Mul<Self, Self> {
fn checked_mul(&self, v: &Self) -> Option<Self>;
}
impl CheckedMul for i8 {
#[inline]
fn checked_mul(&self, v: &i8) -> Option<i8> {
unsafe {
let (x, y) = intrinsics::i8_mul_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
impl CheckedMul for i16 {
#[inline]
fn checked_mul(&self, v: &i16) -> Option<i16> {
unsafe {
let (x, y) = intrinsics::i16_mul_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
impl CheckedMul for i32 {
#[inline]
fn checked_mul(&self, v: &i32) -> Option<i32> {
unsafe {
let (x, y) = intrinsics::i32_mul_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
// FIXME: #8449: should not be disabled on 32-bit
#[cfg(target_word_size = "64")]
impl CheckedMul for i64 {
#[inline]
fn checked_mul(&self, v: &i64) -> Option<i64> {
unsafe {
let (x, y) = intrinsics::i64_mul_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
#[cfg(target_word_size = "32")]
impl CheckedMul for int {
#[inline]
fn checked_mul(&self, v: &int) -> Option<int> {
unsafe {
let (x, y) = intrinsics::i32_mul_with_overflow(*self as i32, *v as i32);
if y { None } else { Some(x as int) }
}
}
}
#[cfg(target_word_size = "64")]
impl CheckedMul for int {
#[inline]
fn checked_mul(&self, v: &int) -> Option<int> {
unsafe {
let (x, y) = intrinsics::i64_mul_with_overflow(*self as i64, *v as i64);
if y { None } else { Some(x as int) }
}
}
}
impl CheckedMul for u8 {
#[inline]
fn checked_mul(&self, v: &u8) -> Option<u8> {
unsafe {
let (x, y) = intrinsics::u8_mul_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
impl CheckedMul for u16 {
#[inline]
fn checked_mul(&self, v: &u16) -> Option<u16> {
unsafe {
let (x, y) = intrinsics::u16_mul_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
impl CheckedMul for u32 {
#[inline]
fn checked_mul(&self, v: &u32) -> Option<u32> {
unsafe {
let (x, y) = intrinsics::u32_mul_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
// FIXME: #8449: should not be disabled on 32-bit
#[cfg(target_word_size = "64")]
impl CheckedMul for u64 {
#[inline]
fn checked_mul(&self, v: &u64) -> Option<u64> {
unsafe {
let (x, y) = intrinsics::u64_mul_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
#[cfg(target_word_size = "32")]
impl CheckedMul for uint {
#[inline]
fn checked_mul(&self, v: &uint) -> Option<uint> {
unsafe {
let (x, y) = intrinsics::u32_mul_with_overflow(*self as u32, *v as u32);
if y { None } else { Some(x as uint) }
}
}
}
#[cfg(target_word_size = "64")]
impl CheckedMul for uint {
#[inline]
fn checked_mul(&self, v: &uint) -> Option<uint> {
unsafe {
let (x, y) = intrinsics::u64_mul_with_overflow(*self as u64, *v as u64);
if y { None } else { Some(x as uint) }
}
}
}
pub trait CheckedDiv: Div<Self, Self> {
fn checked_div(&self, v: &Self) -> Option<Self>;
}

35
src/libstd/num/u16.rs
View File

@ -10,5 +10,40 @@
//! Operations and constants for `u16`
use num::{CheckedAdd, CheckedSub, CheckedMul};
use option::{Option, Some, None};
use unstable::intrinsics;
pub use self::generated::*;
uint_module!(u16, i16, 16)
impl CheckedAdd for u16 {
#[inline]
fn checked_add(&self, v: &u16) -> Option<u16> {
unsafe {
let (x, y) = intrinsics::u16_add_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
impl CheckedSub for u16 {
#[inline]
fn checked_sub(&self, v: &u16) -> Option<u16> {
unsafe {
let (x, y) = intrinsics::u16_sub_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
impl CheckedMul for u16 {
#[inline]
fn checked_mul(&self, v: &u16) -> Option<u16> {
unsafe {
let (x, y) = intrinsics::u16_mul_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}

35
src/libstd/num/u32.rs
View File

@ -10,5 +10,40 @@
//! Operations and constants for `u32`
use num::{CheckedAdd, CheckedSub, CheckedMul};
use option::{Option, Some, None};
use unstable::intrinsics;
pub use self::generated::*;
uint_module!(u32, i32, 32)
impl CheckedAdd for u32 {
#[inline]
fn checked_add(&self, v: &u32) -> Option<u32> {
unsafe {
let (x, y) = intrinsics::u32_add_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
impl CheckedSub for u32 {
#[inline]
fn checked_sub(&self, v: &u32) -> Option<u32> {
unsafe {
let (x, y) = intrinsics::u32_sub_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
impl CheckedMul for u32 {
#[inline]
fn checked_mul(&self, v: &u32) -> Option<u32> {
unsafe {
let (x, y) = intrinsics::u32_mul_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}

37
src/libstd/num/u64.rs
View File

@ -10,5 +10,42 @@
//! Operations and constants for `u64`
use num::{CheckedAdd, CheckedSub, CheckedMul};
use option::{Option, Some, None};
use unstable::intrinsics;
pub use self::generated::*;
uint_module!(u64, i64, 64)
impl CheckedAdd for u64 {
#[inline]
fn checked_add(&self, v: &u64) -> Option<u64> {
unsafe {
let (x, y) = intrinsics::u64_add_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
impl CheckedSub for u64 {
#[inline]
fn checked_sub(&self, v: &u64) -> Option<u64> {
unsafe {
let (x, y) = intrinsics::u64_sub_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
// FIXME: #8449: should not be disabled on 32-bit
#[cfg(target_word_size = "64")]
impl CheckedMul for u64 {
#[inline]
fn checked_mul(&self, v: &u64) -> Option<u64> {
unsafe {
let (x, y) = intrinsics::u64_mul_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}

35
src/libstd/num/u8.rs
View File

@ -10,5 +10,40 @@
//! Operations and constants for `u8`
use num::{CheckedAdd, CheckedSub, CheckedMul};
use option::{Option, Some, None};
use unstable::intrinsics;
pub use self::generated::*;
uint_module!(u8, i8, 8)
impl CheckedAdd for u8 {
#[inline]
fn checked_add(&self, v: &u8) -> Option<u8> {
unsafe {
let (x, y) = intrinsics::u8_add_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
impl CheckedSub for u8 {
#[inline]
fn checked_sub(&self, v: &u8) -> Option<u8> {
unsafe {
let (x, y) = intrinsics::u8_sub_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
impl CheckedMul for u8 {
#[inline]
fn checked_mul(&self, v: &u8) -> Option<u8> {
unsafe {
let (x, y) = intrinsics::u8_mul_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}

69
src/libstd/num/uint.rs
View File

@ -11,6 +11,9 @@
//! Operations and constants for `uint`
use num;
use num::{CheckedAdd, CheckedSub, CheckedMul};
use option::{Option, Some, None};
use unstable::intrinsics;
use sys;
pub use self::generated::*;
@ -101,6 +104,72 @@ pub fn next_power_of_two(n: uint) -> uint {
return tmp + 1u;
}
#[cfg(target_word_size = "32")]
impl CheckedAdd for uint {
#[inline]
fn checked_add(&self, v: &uint) -> Option<uint> {
unsafe {
let (x, y) = intrinsics::u32_add_with_overflow(*self as u32, *v as u32);
if y { None } else { Some(x as uint) }
}
}
}
#[cfg(target_word_size = "64")]
impl CheckedAdd for uint {
#[inline]
fn checked_add(&self, v: &uint) -> Option<uint> {
unsafe {
let (x, y) = intrinsics::u64_add_with_overflow(*self as u64, *v as u64);
if y { None } else { Some(x as uint) }
}
}
}
#[cfg(target_word_size = "32")]
impl CheckedSub for uint {
#[inline]
fn checked_sub(&self, v: &uint) -> Option<uint> {
unsafe {
let (x, y) = intrinsics::u32_sub_with_overflow(*self as u32, *v as u32);
if y { None } else { Some(x as uint) }
}
}
}
#[cfg(target_word_size = "64")]
impl CheckedSub for uint {
#[inline]
fn checked_sub(&self, v: &uint) -> Option<uint> {
unsafe {
let (x, y) = intrinsics::u64_sub_with_overflow(*self as u64, *v as u64);
if y { None } else { Some(x as uint) }
}
}
}
#[cfg(target_word_size = "32")]
impl CheckedMul for uint {
#[inline]
fn checked_mul(&self, v: &uint) -> Option<uint> {
unsafe {
let (x, y) = intrinsics::u32_mul_with_overflow(*self as u32, *v as u32);
if y { None } else { Some(x as uint) }
}
}
}
#[cfg(target_word_size = "64")]
impl CheckedMul for uint {
#[inline]
fn checked_mul(&self, v: &uint) -> Option<uint> {
unsafe {
let (x, y) = intrinsics::u64_mul_with_overflow(*self as u64, *v as u64);
if y { None } else { Some(x as uint) }
}
}
}
#[test]
fn test_next_power_of_two() {
assert!((next_power_of_two(0u) == 0u));