aboutsummaryrefslogtreecommitdiff
path: root/vendor/num-integer/src/average.rs
diff options
context:
space:
mode:
Diffstat (limited to 'vendor/num-integer/src/average.rs')
-rw-r--r--vendor/num-integer/src/average.rs78
1 files changed, 0 insertions, 78 deletions
diff --git a/vendor/num-integer/src/average.rs b/vendor/num-integer/src/average.rs
deleted file mode 100644
index 29cd11e..0000000
--- a/vendor/num-integer/src/average.rs
+++ /dev/null
@@ -1,78 +0,0 @@
-use core::ops::{BitAnd, BitOr, BitXor, Shr};
-use Integer;
-
-/// Provides methods to compute the average of two integers, without overflows.
-pub trait Average: Integer {
- /// Returns the ceiling value of the average of `self` and `other`.
- /// -- `⌈(self + other)/2⌉`
- ///
- /// # Examples
- ///
- /// ```
- /// use num_integer::Average;
- ///
- /// assert_eq!(( 3).average_ceil(&10), 7);
- /// assert_eq!((-2).average_ceil(&-5), -3);
- /// assert_eq!(( 4).average_ceil(& 4), 4);
- ///
- /// assert_eq!(u8::max_value().average_ceil(&2), 129);
- /// assert_eq!(i8::min_value().average_ceil(&-1), -64);
- /// assert_eq!(i8::min_value().average_ceil(&i8::max_value()), 0);
- /// ```
- ///
- fn average_ceil(&self, other: &Self) -> Self;
-
- /// Returns the floor value of the average of `self` and `other`.
- /// -- `⌊(self + other)/2⌋`
- ///
- /// # Examples
- ///
- /// ```
- /// use num_integer::Average;
- ///
- /// assert_eq!(( 3).average_floor(&10), 6);
- /// assert_eq!((-2).average_floor(&-5), -4);
- /// assert_eq!(( 4).average_floor(& 4), 4);
- ///
- /// assert_eq!(u8::max_value().average_floor(&2), 128);
- /// assert_eq!(i8::min_value().average_floor(&-1), -65);
- /// assert_eq!(i8::min_value().average_floor(&i8::max_value()), -1);
- /// ```
- ///
- fn average_floor(&self, other: &Self) -> Self;
-}
-
-impl<I> Average for I
-where
- I: Integer + Shr<usize, Output = I>,
- for<'a, 'b> &'a I:
- BitAnd<&'b I, Output = I> + BitOr<&'b I, Output = I> + BitXor<&'b I, Output = I>,
-{
- // The Henry Gordon Dietz implementation as shown in the Hacker's Delight,
- // see http://aggregate.org/MAGIC/#Average%20of%20Integers
-
- /// Returns the floor value of the average of `self` and `other`.
- #[inline]
- fn average_floor(&self, other: &I) -> I {
- (self & other) + ((self ^ other) >> 1)
- }
-
- /// Returns the ceil value of the average of `self` and `other`.
- #[inline]
- fn average_ceil(&self, other: &I) -> I {
- (self | other) - ((self ^ other) >> 1)
- }
-}
-
-/// Returns the floor value of the average of `x` and `y` --
-/// see [Average::average_floor](trait.Average.html#tymethod.average_floor).
-#[inline]
-pub fn average_floor<T: Average>(x: T, y: T) -> T {
- x.average_floor(&y)
-}
-/// Returns the ceiling value of the average of `x` and `y` --
-/// see [Average::average_ceil](trait.Average.html#tymethod.average_ceil).
-#[inline]
-pub fn average_ceil<T: Average>(x: T, y: T) -> T {
- x.average_ceil(&y)
-}