gen_ratio -> random_probability, gen_bool -> random_probability_f64

Author: oconnor663

benches/benches/bool.rs

@@ -21,7 +21,7 @@ criterion_group!(
 criterion_main!(benches);
 
 pub fn bench(c: &mut Criterion) {
-    let mut g = c.benchmark_group("random_bool");
+    let mut g = c.benchmark_group("random_probability_f64");
     g.sample_size(1000);
     g.warm_up_time(core::time::Duration::from_millis(500));
     g.measurement_time(core::time::Duration::from_millis(1000));
@@ -33,25 +33,25 @@ pub fn bench(c: &mut Criterion) {
 
     g.bench_function("const", |b| {
         let mut rng = Pcg32::from_rng(&mut rand::rng());
-        b.iter(|| rng.random_bool(0.18))
+        b.iter(|| rng.random_probability_f64(0.18))
     });
 
     g.bench_function("var", |b| {
         let mut rng = Pcg32::from_rng(&mut rand::rng());
         let p = rng.random();
-        b.iter(|| rng.random_bool(p))
+        b.iter(|| rng.random_probability_f64(p))
     });
 
     g.bench_function("ratio_const", |b| {
         let mut rng = Pcg32::from_rng(&mut rand::rng());
-        b.iter(|| rng.random_ratio(2, 3))
+        b.iter(|| rng.random_probability(2, 3))
     });
 
     g.bench_function("ratio_var", |b| {
         let mut rng = Pcg32::from_rng(&mut rand::rng());
         let d = rng.random_range(1..=100);
         let n = rng.random_range(0..=d);
-        b.iter(|| rng.random_ratio(n, d));
+        b.iter(|| rng.random_probability(n, d));
     });
 
     g.bench_function("bernoulli_const", |b| {

src/lib.rs

@@ -217,12 +217,12 @@ where
 /// Return a bool with a probability `p` of being true.
 ///
 /// This function is shorthand for
-/// <code>[rng()].[random_bool](Rng::random_bool)(<var>p</var>)</code>.
+/// <code>[rng()].[random_probability_f32](Rng::random_probability_f32)(<var>p</var>)</code>.
 ///
 /// # Example
 ///
 /// ```
-/// println!("{}", rand::random_bool(1.0 / 3.0));
+/// println!("{}", rand::random_probability_f64(1.0 / 3.0));
 /// ```
 ///
 /// # Panics
@@ -231,14 +231,14 @@ where
 #[cfg(all(feature = "std", feature = "std_rng", feature = "getrandom"))]
 #[inline]
 #[track_caller]
-pub fn random_bool(p: f64) -> bool {
-    rng().random_bool(p)
+pub fn random_probability_f64(p: f64) -> bool {
+    rng().random_probability_f64(p)
 }
 
 /// Return a bool with a probability of `numerator/denominator` of being
 /// true.
 ///
-/// That is, `random_ratio(2, 3)` has chance of 2 in 3, or about 67%, of
+/// That is, `random_probability(2, 3)` has chance of 2 in 3, or about 67%, of
 /// returning true. If `numerator == denominator`, then the returned value
 /// is guaranteed to be `true`. If `numerator == 0`, then the returned
 /// value is guaranteed to be `false`.
@@ -247,7 +247,7 @@ pub fn random_bool(p: f64) -> bool {
 /// sampling from the same `numerator` and `denominator` repeatedly.
 ///
 /// This function is shorthand for
-/// <code>[rng()].[random_ratio](Rng::random_ratio)(<var>numerator</var>, <var>denominator</var>)</code>.
+/// <code>[rng()].[random_probability](Rng::random_probability)(<var>numerator</var>, <var>denominator</var>)</code>.
 ///
 /// # Panics
 ///
@@ -256,15 +256,15 @@ pub fn random_bool(p: f64) -> bool {
 /// # Example
 ///
 /// ```
-/// println!("{}", rand::random_ratio(2, 3));
+/// println!("{}", rand::random_probability(2, 3));
 /// ```
 ///
 /// [`Bernoulli`]: distr::Bernoulli
 #[cfg(all(feature = "std", feature = "std_rng", feature = "getrandom"))]
 #[inline]
 #[track_caller]
-pub fn random_ratio(numerator: u32, denominator: u32) -> bool {
-    rng().random_ratio(numerator, denominator)
+pub fn random_probability(numerator: u32, denominator: u32) -> bool {
+    rng().random_probability(numerator, denominator)
 }
 
 /// Fill any type implementing [`Fill`] with random data

src/rng.rs

@@ -178,7 +178,7 @@ pub trait Rng: RngCore {
     /// use rand::Rng;
     ///
     /// let mut rng = rand::rng();
-    /// println!("{}", rng.random_bool(1.0 / 3.0));
+    /// println!("{}", rng.random_probability_f64(1.0 / 3.0));
     /// ```
     ///
     /// # Panics
@@ -188,7 +188,7 @@ pub trait Rng: RngCore {
     /// [`Bernoulli`]: distr::Bernoulli
     #[inline]
     #[track_caller]
-    fn random_bool(&mut self, p: f64) -> bool {
+    fn random_probability_f64(&mut self, p: f64) -> bool {
         match distr::Bernoulli::new(p) {
             Ok(d) => self.sample(d),
             Err(_) => panic!("p={:?} is outside range [0.0, 1.0]", p),
@@ -198,7 +198,7 @@ pub trait Rng: RngCore {
     /// Return a bool with a probability of `numerator/denominator` of being
     /// true.
     ///
-    /// That is, `random_ratio(2, 3)` has chance of 2 in 3, or about 67%, of
+    /// That is, `random_probability(2, 3)` has chance of 2 in 3, or about 67%, of
     /// returning true. If `numerator == denominator`, then the returned value
     /// is guaranteed to be `true`. If `numerator == 0`, then the returned
     /// value is guaranteed to be `false`.
@@ -216,13 +216,13 @@ pub trait Rng: RngCore {
     /// use rand::Rng;
     ///
     /// let mut rng = rand::rng();
-    /// println!("{}", rng.random_ratio(2, 3));
+    /// println!("{}", rng.random_probability(2, 3));
     /// ```
     ///
     /// [`Bernoulli`]: distr::Bernoulli
     #[inline]
     #[track_caller]
-    fn random_ratio(&mut self, numerator: u32, denominator: u32) -> bool {
+    fn random_probability(&mut self, numerator: u32, denominator: u32) -> bool {
         match distr::Bernoulli::from_ratio(numerator, denominator) {
             Ok(d) => self.sample(d),
             Err(_) => panic!(
@@ -339,18 +339,18 @@ pub trait Rng: RngCore {
         self.random_range(range)
     }
 
-    /// Alias for [`Rng::random_bool`].
+    /// Alias for [`Rng::random_probability_f64`].
     #[inline]
-    #[deprecated(since = "0.9.0", note = "Renamed to `random_bool`")]
+    #[deprecated(since = "0.9.0", note = "Renamed to `random_probability_f64`")]
     fn gen_bool(&mut self, p: f64) -> bool {
-        self.random_bool(p)
+        self.random_probability_f64(p)
     }
 
-    /// Alias for [`Rng::random_ratio`].
+    /// Alias for [`Rng::random_probability`].
     #[inline]
-    #[deprecated(since = "0.9.0", note = "Renamed to `random_ratio`")]
+    #[deprecated(since = "0.9.0", note = "Renamed to `random_probability`")]
     fn gen_ratio(&mut self, numerator: u32, denominator: u32) -> bool {
-        self.random_ratio(numerator, denominator)
+        self.random_probability(numerator, denominator)
     }
 }
 
@@ -560,11 +560,11 @@ mod test {
 
     #[test]
     #[allow(clippy::bool_assert_comparison)]
-    fn test_random_bool() {
+    fn test_random_probability_f64() {
         let mut r = rng(105);
         for _ in 0..5 {
-            assert_eq!(r.random_bool(0.0), false);
-            assert_eq!(r.random_bool(1.0), true);
+            assert_eq!(r.random_probability_f64(0.0), false);
+            assert_eq!(r.random_probability_f64(1.0), true);
         }
     }
 
@@ -611,7 +611,7 @@ mod test {
         let mut sum: u32 = 0;
         let mut rng = rng(111);
         for _ in 0..N {
-            if rng.random_ratio(NUM, DENOM) {
+            if rng.random_probability(NUM, DENOM) {
                 sum += 1;
             }
         }

src/seq/coin_flipper.rs

@@ -27,17 +27,17 @@ impl<R: RngCore> CoinFlipper<R> {
     /// Returns true with a probability of 1 / d
     /// Uses an expected two bits of randomness
     /// Panics if d == 0
-    pub fn random_ratio_one_over(&mut self, d: usize) -> bool {
+    pub fn random_probability_one_over(&mut self, d: usize) -> bool {
         debug_assert_ne!(d, 0);
-        // This uses the same logic as `random_ratio` but is optimized for the case that
+        // This uses the same logic as `random_probability` but is optimized for the case that
         // the starting numerator is one (which it always is for `Sequence::Choose()`)
 
-        // In this case (but not `random_ratio`), this way of calculating c is always accurate
+        // In this case (but not `random_probability`), this way of calculating c is always accurate
         let c = (usize::BITS - 1 - d.leading_zeros()).min(32);
 
         if self.flip_c_heads(c) {
             let numerator = 1 << c;
-            self.random_ratio(numerator, d)
+            self.random_probability(numerator, d)
         } else {
             false
         }
@@ -46,7 +46,7 @@ impl<R: RngCore> CoinFlipper<R> {
     #[inline]
     /// Returns true with a probability of n / d
     /// Uses an expected two bits of randomness
-    fn random_ratio(&mut self, mut n: usize, d: usize) -> bool {
+    fn random_probability(&mut self, mut n: usize, d: usize) -> bool {
         // Explanation:
         // We are trying to return true with a probability of n / d
         // If n >= d, we can just return true

src/seq/iterator.rs

@@ -107,7 +107,7 @@ pub trait IteratorRandom: Iterator + Sized {
                     return result;
                 }
                 consumed += 1;
-                if coin_flipper.random_ratio_one_over(consumed) {
+                if coin_flipper.random_probability_one_over(consumed) {
                     result = elem;
                 }
             }
@@ -152,7 +152,7 @@ pub trait IteratorRandom: Iterator + Sized {
             let (lower, _) = self.size_hint();
             if lower >= 2 {
                 let highest_selected = (0..lower)
-                    .filter(|ix| coin_flipper.random_ratio_one_over(consumed + ix + 1))
+                    .filter(|ix| coin_flipper.random_probability_one_over(consumed + ix + 1))
                     .last();
 
                 consumed += lower;
@@ -170,7 +170,7 @@ pub trait IteratorRandom: Iterator + Sized {
                 return result;
             }
 
-            if coin_flipper.random_ratio_one_over(consumed + 1) {
+            if coin_flipper.random_probability_one_over(consumed + 1) {
                 result = elem;
             }
             consumed += 1;