Merge commit '39683d8eb7a32a74bea96ecbf1e87675d3338506' into sync_cg_gcc-2022-03-26

[rust.git] / library / std / src / f64.rs

diff --git a/library/std/src/f64.rs b/library/std/src/f64.rs
index 602cceb5d1a1ce55e13cc98faf9d0baaeaff8743..55e17b471905d29dd293be5e2db9a494e9a55d5c 100644 (file)
--- a/library/std/src/f64.rs
+++ b/library/std/src/f64.rs
@@ -881,42 +881,6 @@ pub fn atanh(self) -> f64 {
         0.5 * ((2.0 * self) / (1.0 - self)).ln_1p()
     }
 
-    /// Linear interpolation between `start` and `end`.
-    ///
-    /// This enables linear interpolation between `start` and `end`, where start is represented by
-    /// `self == 0.0` and `end` is represented by `self == 1.0`. This is the basis of all
-    /// "transition", "easing", or "step" functions; if you change `self` from 0.0 to 1.0
-    /// at a given rate, the result will change from `start` to `end` at a similar rate.
-    ///
-    /// Values below 0.0 or above 1.0 are allowed, allowing you to extrapolate values outside the
-    /// range from `start` to `end`. This also is useful for transition functions which might
-    /// move slightly past the end or start for a desired effect. Mathematically, the values
-    /// returned are equivalent to `start + self * (end - start)`, although we make a few specific
-    /// guarantees that are useful specifically to linear interpolation.
-    ///
-    /// These guarantees are:
-    ///
-    /// * If `start` and `end` are [finite], the value at 0.0 is always `start` and the
-    ///   value at 1.0 is always `end`. (exactness)
-    /// * If `start` and `end` are [finite], the values will always move in the direction from
-    ///   `start` to `end` (monotonicity)
-    /// * If `self` is [finite] and `start == end`, the value at any point will always be
-    ///   `start == end`. (consistency)
-    ///
-    /// [finite]: #method.is_finite
-    #[must_use = "method returns a new number and does not mutate the original value"]
-    #[unstable(feature = "float_interpolation", issue = "86269")]
-    pub fn lerp(self, start: f64, end: f64) -> f64 {
-        // consistent
-        if start == end {
-            start
-
-        // exact/monotonic
-        } else {
-            self.mul_add(end, (-self).mul_add(start, start))
-        }
-    }
-
     // 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).