Updated Yako's branch to master

Author: obsgolem

src/cast.rs

@@ -80,6 +80,57 @@ where
     }
 }
 
+pub trait RealConsts<T: Copy> {
+    #[cfg(has_assoc_const)]
+    const LN_2: T;
+    #[cfg(has_assoc_const)]
+    const FRAC_LN_2: T;
+    #[cfg(has_assoc_const)]
+    const FRAC_LN_10: T;
+
+    fn ln_2() -> T;
+    fn frac_ln_2() -> T;
+    fn frac_ln_10() -> T;
+}
+
+impl RealConsts<f32> for f32 {
+    #[cfg(has_assoc_const)]
+    const LN_2: f32 = 0.693147180559945309417232121458176568_f32;
+    #[cfg(has_assoc_const)]
+    const FRAC_LN_2: f32 = 1.442695040888963407359924681001892137_f32;
+    #[cfg(has_assoc_const)]
+    const FRAC_LN_10: f32 = 0.434294481903251827651128918916605082_f32;
+
+    fn ln_2() -> f32 {
+        0.693147180559945309417232121458176568_f32
+    }
+    fn frac_ln_2() -> f32 {
+        1.442695040888963407359924681001892137_f32
+    }
+    fn frac_ln_10() -> f32 {
+        0.434294481903251827651128918916605082_f32
+    }
+}
+
+impl RealConsts<f64> for f64 {
+    #[cfg(has_assoc_const)]
+    const LN_2: f64 = 0.693147180559945309417232121458176568_f64;
+    #[cfg(has_assoc_const)]
+    const FRAC_LN_2: f64 = 1.442695040888963407359924681001892137_f64;
+    #[cfg(has_assoc_const)]
+    const FRAC_LN_10: f64 = 0.434294481903251827651128918916605082_f64;
+
+    fn ln_2() -> f64 {
+        0.693147180559945309417232121458176568_f64
+    }
+    fn frac_ln_2() -> f64 {
+        1.442695040888963407359924681001892137_f64
+    }
+    fn frac_ln_10() -> f64 {
+        0.434294481903251827651128918916605082_f64
+    }
+}
+
 #[cfg(test)]
 mod test {
     use super::*;