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Fix float NaN pos/neg assumptions

This commit is contained in:
Lee Bousfield 2017-07-08 17:15:35 -04:00
parent 8964c65f38
commit f0fa65a9d5
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GPG Key ID: C41F6504C1164209
1 changed files with 7 additions and 9 deletions
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16
traits/src/float.rs
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@ -323,8 +323,8 @@ pub trait Float
/// ```
fn signum(self) -> Self;
/// Returns `true` if `self` is positive, including `+0.0` and
/// `Float::infinity()`.
/// Returns `true` if `self` is positive, including `+0.0`,
/// `Float::infinity()`, and `f64::NAN` with newer versions of Rust.
///
/// ```
/// use num_traits::Float;
@ -337,27 +337,25 @@ pub trait Float
///
/// assert!(f.is_sign_positive());
/// assert!(!g.is_sign_positive());
/// // Requires both tests to determine if is `NaN`
/// assert!(!nan.is_sign_positive() && !nan.is_sign_negative());
/// assert!(!nan.is_sign_negative());
/// ```
fn is_sign_positive(self) -> bool;
/// Returns `true` if `self` is negative, including `-0.0` and
/// `Float::neg_infinity()`.
/// Returns `true` if `self` is negative, including `-0.0`,
/// `Float::neg_infinity()`, and `-f64::NAN` with newer versions of Rust.
///
/// ```
/// use num_traits::Float;
/// use std::f64;
///
/// let nan = f64::NAN;
/// let neg_nan: f64 = -f64::NAN;
///
/// let f = 7.0;
/// let g = -7.0;
///
/// assert!(!f.is_sign_negative());
/// assert!(g.is_sign_negative());
/// // Requires both tests to determine if is `NaN`.
/// assert!(!nan.is_sign_positive() && !nan.is_sign_negative());
/// assert!(!neg_nan.is_sign_positive());
/// ```
fn is_sign_negative(self) -> bool;