Add clamp functions

src/libcore/cmp.rs

@@ -481,6 +481,32 @@ pub trait Ord: Eq + PartialOrd<Self> {
     where Self: Sized {
         if self <= other { self } else { other }
     }
+
+    /// Returns max if self is greater than max, and min if self is less than min.
+    /// Otherwise this will return self.  Panics if min > max.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(clamp)]
+    ///
+    /// assert!((-3).clamp(-2, 1) == -2);
+    /// assert!(0.clamp(-2, 1) == 0);
+    /// assert!(2.clamp(-2, 1) == 1);
+    /// ```
+    #[unstable(feature = "clamp", issue = "44095")]
+    fn clamp(self, min: Self, max: Self) -> Self
+    where Self: Sized {
+        assert!(min <= max);
+        if self < min {
+            min
+        }
+        else if self > max {
+            max
+        } else {
+            self
+        }
+    }
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]

src/libstd/f32.rs

@@ -1080,6 +1080,27 @@ impl f32 {
         0.5 * ((2.0 * self) / (1.0 - self)).ln_1p()
     }
 
+    /// Returns max if self is greater than max, and min if self is less than min.
+    /// Otherwise this returns self.  Panics if min > max, min equals NaN, or max equals NaN.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// assert!((-3.0f32).clamp(-2.0f32, 1.0f32) == -2.0f32);
+    /// assert!((0.0f32).clamp(-2.0f32, 1.0f32) == 0.0f32);
+    /// assert!((2.0f32).clamp(-2.0f32, 1.0f32) == 1.0f32);
+    /// assert!((NAN).clamp(-2.0f32, 1.0f32) == NAN);
+    /// ```
+    #[unstable(feature = "clamp", issue = "44095")]
+    #[inline]
+    pub fn clamp(self, min: f32, max: f32) -> f32 {
+        assert!(min <= max);
+        let mut x = self;
+        if x < min { x = min; }
+        if x > max { x = max; }
+        x
+    }
+
     /// Raw transmutation to `u32`.
     ///
     /// Converts the `f32` into its raw memory representation,

src/libstd/f64.rs

@@ -970,6 +970,27 @@ impl f64 {
         0.5 * ((2.0 * self) / (1.0 - self)).ln_1p()
     }
 
+    /// Returns max if self is greater than max, and min if self is less than min.
+    /// Otherwise this returns self.  Panics if min > max, min equals NaN, or max equals NaN.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// assert!((-3.0f64).clamp(-2.0f64, 1.0f64) == -2.0f64);
+    /// assert!((0.0f64).clamp(-2.0f64, 1.0f64) == 0.0f64);
+    /// assert!((2.0f64).clamp(-2.0f64, 1.0f64) == 1.0f64);
+    /// assert!((NAN).clamp(-2.0f64, 1.0f64) == NAN);
+    /// ```
+    #[unstable(feature = "clamp", issue = "44095")]
+    #[inline]
+    pub fn clamp(self, min: f64, max: f64) -> f64 {
+        assert!(min <= max);
+        let mut x = self;
+        if x < min { x = min; }
+        if x > max { x = max; }
+        x
+    }
+
     // Solaris/Illumos requires a wrapper around log, log2, and log10 functions
     // because of their non-standard behavior (e.g. log(-n) returns -Inf instead
     // of expected NaN).