Merge rust-num#73 rust-num#74

73: Add a libm feature for Float r=cuviper a=cuviper



74: char::is_whitespace is available even in core now r=cuviper a=cuviper



Co-authored-by: Josh Stone <cuviper@gmail.com>

Author: bors[bot]

.travis.yml

@@ -18,7 +18,7 @@ matrix:
       before_script:
         - rustup target add $TARGET
       script:
-        - cargo build --verbose --target $TARGET --no-default-features --features rand,serde
+        - cargo build --verbose --target $TARGET --no-default-features --features libm,rand,serde
     - name: "rustfmt"
       rust: 1.31.0
       before_script:

Cargo.toml

@@ -37,3 +37,4 @@ default-features = false
 [features]
 default = ["std"]
 std = ["num-traits/std"]
+libm = ["num-traits/libm"]

README.md

@@ -27,9 +27,9 @@ version = "0.3"
 default-features = false
 ```
 
-Features based on `Float` types are only available when `std` is enabled. Where
-possible, `FloatCore` is used instead.  Formatting complex numbers only supports
-format width when `std` is enabled.
+Features based on `Float` types are only available when `std` or `libm` is
+enabled. Where possible, `FloatCore` is used instead.  Formatting complex
+numbers only supports format width when `std` is enabled.
 
 ## Releases
 

ci/test_full.sh

@@ -5,8 +5,8 @@ set -ex
 echo Testing num-complex on rustc ${TRAVIS_RUST_VERSION}
 
 case "$TRAVIS_RUST_VERSION" in
-  1.31.*) FEATURES="serde" ;;
-  *) FEATURES="serde rand" ;;
+  1.31.*) FEATURES="libm serde" ;;
+  *) FEATURES="libm serde rand" ;;
 esac
 
 # num-complex should build and test everywhere.

src/lib.rs

@@ -32,7 +32,7 @@ use std::error::Error;
 
 use num_traits::{Inv, MulAdd, Num, One, Pow, Signed, Zero};
 
-#[cfg(feature = "std")]
+#[cfg(any(feature = "std", feature = "libm"))]
 use num_traits::float::Float;
 use num_traits::float::FloatCore;
 
@@ -159,7 +159,7 @@ impl<T: Clone + Signed> Complex<T> {
     }
 }
 
-#[cfg(feature = "std")]
+#[cfg(any(feature = "std", feature = "libm"))]
 impl<T: Clone + Float> Complex<T> {
     /// Calculate |self|
     #[inline]
@@ -1269,25 +1269,6 @@ where
     F: Fn(&str) -> Result<T, E>,
     T: Clone + Num,
 {
-    #[cfg(not(feature = "std"))]
-    #[inline]
-    fn is_whitespace(c: char) -> bool {
-        match c {
-            ' ' | '\x09'..='\x0d' => true,
-            _ if c > '\x7f' => match c {
-                '\u{0085}' | '\u{00a0}' | '\u{1680}' => true,
-                '\u{2000}'..='\u{200a}' => true,
-                '\u{2028}' | '\u{2029}' | '\u{202f}' | '\u{205f}' => true,
-                '\u{3000}' => true,
-                _ => false,
-            },
-            _ => false,
-        }
-    }
-
-    #[cfg(feature = "std")]
-    let is_whitespace = char::is_whitespace;
-
     let imag = match s.rfind('j') {
         None => 'i',
         _ => 'j',
@@ -1304,8 +1285,8 @@ where
         // ignore '+'/'-' if part of an exponent
         if (c == b'+' || c == b'-') && !(p == b'e' || p == b'E') {
             // trim whitespace around the separator
-            a = &s[..=i].trim_right_matches(is_whitespace);
-            b = &s[i + 2..].trim_left_matches(is_whitespace);
+            a = &s[..=i].trim_right_matches(char::is_whitespace);
+            b = &s[i + 2..].trim_left_matches(char::is_whitespace);
             neg_b = c == b'-';
 
             if b.is_empty() || (neg_b && b.starts_with('-')) {
@@ -1604,7 +1585,7 @@ mod test {
         }
     }
 
-    #[cfg(feature = "std")]
+    #[cfg(any(feature = "std", feature = "libm"))]
     mod float {
         use super::*;
         use num_traits::{Float, Pow};
@@ -2265,7 +2246,7 @@ mod test {
         }
 
         #[test]
-        #[cfg(feature = "std")]
+        #[cfg(any(feature = "std", feature = "libm"))]
         fn test_mul_add_float() {
             assert_eq!(_05_05i.mul_add(_05_05i, _0_0i), _05_05i * _05_05i + _0_0i);
             assert_eq!(_05_05i * _05_05i + _0_0i, _05_05i.mul_add(_05_05i, _0_0i));

src/pow.rs

@@ -1,7 +1,7 @@
 use super::Complex;
 
 use core::ops::Neg;
-#[cfg(feature = "std")]
+#[cfg(any(feature = "std", feature = "libm"))]
 use num_traits::Float;
 use num_traits::{Num, One, Pow};
 
@@ -85,7 +85,7 @@ pow_impl!(u128, i128);
 
 macro_rules! powf_impl {
     ($F:ty) => {
-        #[cfg(feature = "std")]
+        #[cfg(any(feature = "std", feature = "libm"))]
         impl<'a, T: Float> Pow<$F> for &'a Complex<T>
         where
             $F: Into<T>,
@@ -98,7 +98,7 @@ macro_rules! powf_impl {
             }
         }
 
-        #[cfg(feature = "std")]
+        #[cfg(any(feature = "std", feature = "libm"))]
         impl<'a, 'b, T: Float> Pow<&'b $F> for &'a Complex<T>
         where
             $F: Into<T>,
@@ -111,7 +111,7 @@ macro_rules! powf_impl {
             }
         }
 
-        #[cfg(feature = "std")]
+        #[cfg(any(feature = "std", feature = "libm"))]
         impl<T: Float> Pow<$F> for Complex<T>
         where
             $F: Into<T>,
@@ -124,7 +124,7 @@ macro_rules! powf_impl {
             }
         }
 
-        #[cfg(feature = "std")]
+        #[cfg(any(feature = "std", feature = "libm"))]
         impl<'b, T: Float> Pow<&'b $F> for Complex<T>
         where
             $F: Into<T>,
@@ -145,7 +145,7 @@ powf_impl!(f64);
 // These blanket impls are OK, because both the target type and the trait parameter would be
 // foreign to anyone else trying to implement something that would overlap, raising E0117.
 
-#[cfg(feature = "std")]
+#[cfg(any(feature = "std", feature = "libm"))]
 impl<'a, T: Float> Pow<Complex<T>> for &'a Complex<T> {
     type Output = Complex<T>;
 
@@ -155,7 +155,7 @@ impl<'a, T: Float> Pow<Complex<T>> for &'a Complex<T> {
     }
 }
 
-#[cfg(feature = "std")]
+#[cfg(any(feature = "std", feature = "libm"))]
 impl<'a, 'b, T: Float> Pow<&'b Complex<T>> for &'a Complex<T> {
     type Output = Complex<T>;
 
@@ -165,7 +165,7 @@ impl<'a, 'b, T: Float> Pow<&'b Complex<T>> for &'a Complex<T> {
     }
 }
 
-#[cfg(feature = "std")]
+#[cfg(any(feature = "std", feature = "libm"))]
 impl<T: Float> Pow<Complex<T>> for Complex<T> {
     type Output = Complex<T>;
 
@@ -175,7 +175,7 @@ impl<T: Float> Pow<Complex<T>> for Complex<T> {
     }
 }
 
-#[cfg(feature = "std")]
+#[cfg(any(feature = "std", feature = "libm"))]
 impl<'b, T: Float> Pow<&'b Complex<T>> for Complex<T> {
     type Output = Complex<T>;