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-rw-r--r--ctr-std/src/num.rs296
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diff --git a/ctr-std/src/num.rs b/ctr-std/src/num.rs
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-// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <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.
-
-//! Additional functionality for numerics.
-//!
-//! This module provides some extra types that are useful when doing numerical
-//! work. See the individual documentation for each piece for more information.
-
-#![stable(feature = "rust1", since = "1.0.0")]
-#![allow(missing_docs)]
-
-#[stable(feature = "rust1", since = "1.0.0")]
-pub use core::num::{FpCategory, ParseIntError, ParseFloatError, TryFromIntError};
-#[stable(feature = "rust1", since = "1.0.0")]
-pub use core::num::Wrapping;
-
-#[stable(feature = "nonzero", since = "1.28.0")]
-pub use core::num::{NonZeroU8, NonZeroU16, NonZeroU32, NonZeroU64, NonZeroU128, NonZeroUsize};
-
-#[cfg(test)] use fmt;
-#[cfg(test)] use ops::{Add, Sub, Mul, Div, Rem};
-
-/// Helper function for testing numeric operations
-#[cfg(test)]
-pub fn test_num<T>(ten: T, two: T) where
- T: PartialEq
- + Add<Output=T> + Sub<Output=T>
- + Mul<Output=T> + Div<Output=T>
- + Rem<Output=T> + fmt::Debug
- + Copy
-{
- assert_eq!(ten.add(two), ten + two);
- assert_eq!(ten.sub(two), ten - two);
- assert_eq!(ten.mul(two), ten * two);
- assert_eq!(ten.div(two), ten / two);
- assert_eq!(ten.rem(two), ten % two);
-}
-
-#[cfg(test)]
-mod tests {
- use u8;
- use u16;
- use u32;
- use u64;
- use usize;
- use ops::Mul;
-
- #[test]
- fn test_saturating_add_uint() {
- use usize::MAX;
- assert_eq!(3_usize.saturating_add(5_usize), 8_usize);
- assert_eq!(3_usize.saturating_add(MAX-1), MAX);
- assert_eq!(MAX.saturating_add(MAX), MAX);
- assert_eq!((MAX-2).saturating_add(1), MAX-1);
- }
-
- #[test]
- fn test_saturating_sub_uint() {
- use usize::MAX;
- assert_eq!(5_usize.saturating_sub(3_usize), 2_usize);
- assert_eq!(3_usize.saturating_sub(5_usize), 0_usize);
- assert_eq!(0_usize.saturating_sub(1_usize), 0_usize);
- assert_eq!((MAX-1).saturating_sub(MAX), 0);
- }
-
- #[test]
- fn test_saturating_add_int() {
- use isize::{MIN,MAX};
- assert_eq!(3i32.saturating_add(5), 8);
- assert_eq!(3isize.saturating_add(MAX-1), MAX);
- assert_eq!(MAX.saturating_add(MAX), MAX);
- assert_eq!((MAX-2).saturating_add(1), MAX-1);
- assert_eq!(3i32.saturating_add(-5), -2);
- assert_eq!(MIN.saturating_add(-1), MIN);
- assert_eq!((-2isize).saturating_add(-MAX), MIN);
- }
-
- #[test]
- fn test_saturating_sub_int() {
- use isize::{MIN,MAX};
- assert_eq!(3i32.saturating_sub(5), -2);
- assert_eq!(MIN.saturating_sub(1), MIN);
- assert_eq!((-2isize).saturating_sub(MAX), MIN);
- assert_eq!(3i32.saturating_sub(-5), 8);
- assert_eq!(3isize.saturating_sub(-(MAX-1)), MAX);
- assert_eq!(MAX.saturating_sub(-MAX), MAX);
- assert_eq!((MAX-2).saturating_sub(-1), MAX-1);
- }
-
- #[test]
- fn test_checked_add() {
- let five_less = usize::MAX - 5;
- assert_eq!(five_less.checked_add(0), Some(usize::MAX - 5));
- assert_eq!(five_less.checked_add(1), Some(usize::MAX - 4));
- assert_eq!(five_less.checked_add(2), Some(usize::MAX - 3));
- assert_eq!(five_less.checked_add(3), Some(usize::MAX - 2));
- assert_eq!(five_less.checked_add(4), Some(usize::MAX - 1));
- assert_eq!(five_less.checked_add(5), Some(usize::MAX));
- assert_eq!(five_less.checked_add(6), None);
- assert_eq!(five_less.checked_add(7), None);
- }
-
- #[test]
- fn test_checked_sub() {
- assert_eq!(5_usize.checked_sub(0), Some(5));
- assert_eq!(5_usize.checked_sub(1), Some(4));
- assert_eq!(5_usize.checked_sub(2), Some(3));
- assert_eq!(5_usize.checked_sub(3), Some(2));
- assert_eq!(5_usize.checked_sub(4), Some(1));
- assert_eq!(5_usize.checked_sub(5), Some(0));
- assert_eq!(5_usize.checked_sub(6), None);
- assert_eq!(5_usize.checked_sub(7), None);
- }
-
- #[test]
- fn test_checked_mul() {
- let third = usize::MAX / 3;
- assert_eq!(third.checked_mul(0), Some(0));
- assert_eq!(third.checked_mul(1), Some(third));
- assert_eq!(third.checked_mul(2), Some(third * 2));
- assert_eq!(third.checked_mul(3), Some(third * 3));
- assert_eq!(third.checked_mul(4), None);
- }
-
- macro_rules! test_is_power_of_two {
- ($test_name:ident, $T:ident) => (
- fn $test_name() {
- #![test]
- assert_eq!((0 as $T).is_power_of_two(), false);
- assert_eq!((1 as $T).is_power_of_two(), true);
- assert_eq!((2 as $T).is_power_of_two(), true);
- assert_eq!((3 as $T).is_power_of_two(), false);
- assert_eq!((4 as $T).is_power_of_two(), true);
- assert_eq!((5 as $T).is_power_of_two(), false);
- assert_eq!(($T::MAX / 2 + 1).is_power_of_two(), true);
- }
- )
- }
-
- test_is_power_of_two!{ test_is_power_of_two_u8, u8 }
- test_is_power_of_two!{ test_is_power_of_two_u16, u16 }
- test_is_power_of_two!{ test_is_power_of_two_u32, u32 }
- test_is_power_of_two!{ test_is_power_of_two_u64, u64 }
- test_is_power_of_two!{ test_is_power_of_two_uint, usize }
-
- macro_rules! test_next_power_of_two {
- ($test_name:ident, $T:ident) => (
- fn $test_name() {
- #![test]
- assert_eq!((0 as $T).next_power_of_two(), 1);
- let mut next_power = 1;
- for i in 1 as $T..40 {
- assert_eq!(i.next_power_of_two(), next_power);
- if i == next_power { next_power *= 2 }
- }
- }
- )
- }
-
- test_next_power_of_two! { test_next_power_of_two_u8, u8 }
- test_next_power_of_two! { test_next_power_of_two_u16, u16 }
- test_next_power_of_two! { test_next_power_of_two_u32, u32 }
- test_next_power_of_two! { test_next_power_of_two_u64, u64 }
- test_next_power_of_two! { test_next_power_of_two_uint, usize }
-
- macro_rules! test_checked_next_power_of_two {
- ($test_name:ident, $T:ident) => (
- fn $test_name() {
- #![test]
- assert_eq!((0 as $T).checked_next_power_of_two(), Some(1));
- let smax = $T::MAX >> 1;
- assert_eq!(smax.checked_next_power_of_two(), Some(smax+1));
- assert_eq!((smax + 1).checked_next_power_of_two(), Some(smax + 1));
- assert_eq!((smax + 2).checked_next_power_of_two(), None);
- assert_eq!(($T::MAX - 1).checked_next_power_of_two(), None);
- assert_eq!($T::MAX.checked_next_power_of_two(), None);
- let mut next_power = 1;
- for i in 1 as $T..40 {
- assert_eq!(i.checked_next_power_of_two(), Some(next_power));
- if i == next_power { next_power *= 2 }
- }
- }
- )
- }
-
- test_checked_next_power_of_two! { test_checked_next_power_of_two_u8, u8 }
- test_checked_next_power_of_two! { test_checked_next_power_of_two_u16, u16 }
- test_checked_next_power_of_two! { test_checked_next_power_of_two_u32, u32 }
- test_checked_next_power_of_two! { test_checked_next_power_of_two_u64, u64 }
- test_checked_next_power_of_two! { test_checked_next_power_of_two_uint, usize }
-
- #[test]
- fn test_pow() {
- fn naive_pow<T: Mul<Output=T> + Copy>(one: T, base: T, exp: usize) -> T {
- (0..exp).fold(one, |acc, _| acc * base)
- }
- macro_rules! assert_pow {
- (($num:expr, $exp:expr) => $expected:expr) => {{
- let result = $num.pow($exp);
- assert_eq!(result, $expected);
- assert_eq!(result, naive_pow(1, $num, $exp));
- }}
- }
- assert_pow!((3u32, 0 ) => 1);
- assert_pow!((5u32, 1 ) => 5);
- assert_pow!((-4i32, 2 ) => 16);
- assert_pow!((8u32, 3 ) => 512);
- assert_pow!((2u64, 50) => 1125899906842624);
- }
-
- #[test]
- fn test_uint_to_str_overflow() {
- let mut u8_val: u8 = 255;
- assert_eq!(u8_val.to_string(), "255");
-
- u8_val = u8_val.wrapping_add(1);
- assert_eq!(u8_val.to_string(), "0");
-
- let mut u16_val: u16 = 65_535;
- assert_eq!(u16_val.to_string(), "65535");
-
- u16_val = u16_val.wrapping_add(1);
- assert_eq!(u16_val.to_string(), "0");
-
- let mut u32_val: u32 = 4_294_967_295;
- assert_eq!(u32_val.to_string(), "4294967295");
-
- u32_val = u32_val.wrapping_add(1);
- assert_eq!(u32_val.to_string(), "0");
-
- let mut u64_val: u64 = 18_446_744_073_709_551_615;
- assert_eq!(u64_val.to_string(), "18446744073709551615");
-
- u64_val = u64_val.wrapping_add(1);
- assert_eq!(u64_val.to_string(), "0");
- }
-
- fn from_str<T: ::str::FromStr>(t: &str) -> Option<T> {
- ::str::FromStr::from_str(t).ok()
- }
-
- #[test]
- fn test_uint_from_str_overflow() {
- let mut u8_val: u8 = 255;
- assert_eq!(from_str::<u8>("255"), Some(u8_val));
- assert_eq!(from_str::<u8>("256"), None);
-
- u8_val = u8_val.wrapping_add(1);
- assert_eq!(from_str::<u8>("0"), Some(u8_val));
- assert_eq!(from_str::<u8>("-1"), None);
-
- let mut u16_val: u16 = 65_535;
- assert_eq!(from_str::<u16>("65535"), Some(u16_val));
- assert_eq!(from_str::<u16>("65536"), None);
-
- u16_val = u16_val.wrapping_add(1);
- assert_eq!(from_str::<u16>("0"), Some(u16_val));
- assert_eq!(from_str::<u16>("-1"), None);
-
- let mut u32_val: u32 = 4_294_967_295;
- assert_eq!(from_str::<u32>("4294967295"), Some(u32_val));
- assert_eq!(from_str::<u32>("4294967296"), None);
-
- u32_val = u32_val.wrapping_add(1);
- assert_eq!(from_str::<u32>("0"), Some(u32_val));
- assert_eq!(from_str::<u32>("-1"), None);
-
- let mut u64_val: u64 = 18_446_744_073_709_551_615;
- assert_eq!(from_str::<u64>("18446744073709551615"), Some(u64_val));
- assert_eq!(from_str::<u64>("18446744073709551616"), None);
-
- u64_val = u64_val.wrapping_add(1);
- assert_eq!(from_str::<u64>("0"), Some(u64_val));
- assert_eq!(from_str::<u64>("-1"), None);
- }
-}
-
-
-#[cfg(test)]
-mod bench {
- extern crate test;
- use self::test::Bencher;
-
- #[bench]
- fn bench_pow_function(b: &mut Bencher) {
- let v = (0..1024).collect::<Vec<u32>>();
- b.iter(|| {v.iter().fold(0u32, |old, new| old.pow(*new as u32));});
- }
-}
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