Move saturating operator methods into Int

src/libcore/iter.rs

@@ -62,7 +62,7 @@ trait defined in this module. For loops can be viewed as a syntactical expansion
 use cmp;
 use cmp::{PartialEq, PartialOrd, Ord};
 use mem;
-use num::{Zero, One, CheckedAdd, CheckedSub, Saturating, ToPrimitive, Int};
+use num::{Zero, One, CheckedAdd, CheckedSub, ToPrimitive, Int};
 use ops::{Add, Mul, Sub};
 use option::{Option, Some, None};
 use uint;

src/libcore/num/mod.rs

@@ -525,6 +525,28 @@ fn to_be(self) -> Self { // or not to be?
     fn to_le(self) -> Self {
         if cfg!(target_endian = "little") { self } else { self.swap_bytes() }
     }
+
+    /// Saturating addition. Returns `self + other`, saturating at the
+    /// numeric bounds instead of overflowing.
+    #[inline]
+    fn saturating_add(self, other: Self) -> Self {
+        match self.checked_add(&other) {
+            Some(x)                       => x,
+            None if other >= Zero::zero() => Bounded::max_value(),
+            None                          => Bounded::min_value(),
+        }
+    }
+
+    /// Saturating subtraction. Returns `self - other`, saturating at the
+    /// numeric bounds instead of overflowing.
+    #[inline]
+    fn saturating_sub(self, other: Self) -> Self {
+        match self.checked_sub(&other) {
+            Some(x)                       => x,
+            None if other >= Zero::zero() => Bounded::min_value(),
+            None                          => Bounded::max_value(),
+        }
+    }
 }
 
 macro_rules! int_impl {
@@ -1150,43 +1172,6 @@ fn from<N: ToPrimitive>(n: N) -> Option<$T> {
 impl_num_cast!(f32,   to_f32)
 impl_num_cast!(f64,   to_f64)
 
-/// Saturating math operations
-pub trait Saturating {
-    /// Saturating addition operator.
-    /// Returns a+b, saturating at the numeric bounds instead of overflowing.
-    fn saturating_add(self, v: Self) -> Self;
-
-    /// Saturating subtraction operator.
-    /// Returns a-b, saturating at the numeric bounds instead of overflowing.
-    fn saturating_sub(self, v: Self) -> Self;
-}
-
-impl<T: CheckedAdd + CheckedSub + Zero + PartialOrd + Bounded> Saturating for T {
-    #[inline]
-    fn saturating_add(self, v: T) -> T {
-        match self.checked_add(&v) {
-            Some(x) => x,
-            None => if v >= Zero::zero() {
-                Bounded::max_value()
-            } else {
-                Bounded::min_value()
-            }
-        }
-    }
-
-    #[inline]
-    fn saturating_sub(self, v: T) -> T {
-        match self.checked_sub(&v) {
-            Some(x) => x,
-            None => if v >= Zero::zero() {
-                Bounded::min_value()
-            } else {
-                Bounded::max_value()
-            }
-        }
-    }
-}
-
 /// Performs addition that returns `None` instead of wrapping around on overflow.
 pub trait CheckedAdd: Add<Self, Self> {
     /// Adds two numbers, checking for overflow. If overflow happens, `None` is returned.

src/libcore/slice.rs

@@ -40,7 +40,7 @@
 use cmp;
 use default::Default;
 use iter::*;
-use num::{CheckedAdd, Saturating, div_rem};
+use num::{CheckedAdd, Int, div_rem};
 use ops;
 use option::{None, Option, Some};
 use ptr;

src/libcore/str.rs

@@ -25,7 +25,7 @@
 use iter::{DoubleEndedIterator, ExactSize};
 use iter::range;
 use kinds::Sized;
-use num::{CheckedMul, Saturating};
+use num::{CheckedMul, Int};
 use option::{Option, None, Some};
 use raw::Repr;
 use slice::{mod, SlicePrelude};

src/libstd/num/mod.rs

@@ -23,7 +23,7 @@
 pub use core::num::{Num, div_rem, Zero, zero, One, one};
 pub use core::num::{Signed, abs, signum};
 pub use core::num::{Unsigned, pow, Bounded};
-pub use core::num::{Primitive, Int, UnsignedInt, Saturating};
+pub use core::num::{Primitive, Int, UnsignedInt};
 pub use core::num::{CheckedAdd, CheckedSub, CheckedMul, CheckedDiv};
 pub use core::num::{cast, FromPrimitive, NumCast, ToPrimitive};
 pub use core::num::{next_power_of_two, is_power_of_two};

src/libtest/lib.rs

@@ -106,7 +106,6 @@ enum NamePadding { PadNone, PadOnLeft, PadOnRight }
 
 impl TestDesc {
     fn padded_name(&self, column_count: uint, align: NamePadding) -> String {
-        use std::num::Saturating;
         let mut name = String::from_str(self.name.as_slice());
         let fill = column_count.saturating_sub(name.len());
         let mut pad = " ".repeat(fill);