Merge tag 'debian/1.52.1+dfsg1-1_exp2' into proxmox/buster

[rustc.git] / vendor / rand / src / distributions / unit_sphere.rs

diff --git a/vendor/rand/src/distributions/unit_sphere.rs b/vendor/rand/src/distributions/unit_sphere.rs
deleted file mode 100644 (file)
index 5b8c8ad..0000000
--- a/vendor/rand/src/distributions/unit_sphere.rs
+++ /dev/null
@@ -1,97 +0,0 @@
-// Copyright 2018 Developers of the Rand project.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-#![allow(deprecated)]
-#![allow(clippy::all)]
-
-use crate::distributions::{Distribution, Uniform};
-use crate::Rng;
-
-/// Samples uniformly from the surface of the unit sphere in three dimensions.
-///
-/// Implemented via a method by Marsaglia[^1].
-///
-/// [^1]: Marsaglia, George (1972). [*Choosing a Point from the Surface of a
-///       Sphere.*](https://doi.org/10.1214/aoms/1177692644)
-///       Ann. Math. Statist. 43, no. 2, 645--646.
-#[deprecated(since = "0.7.0", note = "moved to rand_distr crate")]
-#[derive(Clone, Copy, Debug)]
-pub struct UnitSphereSurface;
-
-impl UnitSphereSurface {
-    /// Construct a new `UnitSphereSurface` distribution.
-    #[inline]
-    pub fn new() -> UnitSphereSurface {
-        UnitSphereSurface
-    }
-}
-
-impl Distribution<[f64; 3]> for UnitSphereSurface {
-    #[inline]
-    fn sample<R: Rng + ?Sized>(&self, rng: &mut R) -> [f64; 3] {
-        let uniform = Uniform::new(-1., 1.);
-        loop {
-            let (x1, x2) = (uniform.sample(rng), uniform.sample(rng));
-            let sum = x1 * x1 + x2 * x2;
-            if sum >= 1. {
-                continue;
-            }
-            let factor = 2. * (1.0_f64 - sum).sqrt();
-            return [x1 * factor, x2 * factor, 1. - 2. * sum];
-        }
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::UnitSphereSurface;
-    use crate::distributions::Distribution;
-
-    /// Assert that two numbers are almost equal to each other.
-    ///
-    /// On panic, this macro will print the values of the expressions with their
-    /// debug representations.
-    macro_rules! assert_almost_eq {
-        ($a:expr, $b:expr, $prec:expr) => {
-            let diff = ($a - $b).abs();
-            if diff > $prec {
-                panic!(format!(
-                    "assertion failed: `abs(left - right) = {:.1e} < {:e}`, \
-                     (left: `{}`, right: `{}`)",
-                    diff, $prec, $a, $b
-                ));
-            }
-        };
-    }
-
-    #[test]
-    fn norm() {
-        let mut rng = crate::test::rng(1);
-        let dist = UnitSphereSurface::new();
-        for _ in 0..1000 {
-            let x = dist.sample(&mut rng);
-            assert_almost_eq!(x[0] * x[0] + x[1] * x[1] + x[2] * x[2], 1., 1e-15);
-        }
-    }
-
-    #[test]
-    fn value_stability() {
-        let mut rng = crate::test::rng(2);
-        let expected = [
-            [0.03247542860231647, -0.7830477442152738, 0.6211131755296027],
-            [-0.09978440840914075, 0.9706650829833128, -0.21875184231323952],
-            [0.2735582468624679, 0.9435374242279655, -0.1868234852870203],
-        ];
-        let samples = [
-            UnitSphereSurface.sample(&mut rng),
-            UnitSphereSurface.sample(&mut rng),
-            UnitSphereSurface.sample(&mut rng),
-        ];
-        assert_eq!(samples, expected);
-    }
-}