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Added a note for the usage of abs() with ::MIN #16769

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Aug 31, 2014
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Added a note for the usage of abs() with ::MIN #16769

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8 changes: 6 additions & 2 deletions src/libcore/num/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -160,6 +160,8 @@ pub trait Signed: Num + Neg<Self> {
/// Computes the absolute value.
///
/// For `f32` and `f64`, `NaN` will be returned if the number is `NaN`.
///
/// For signed integers, `::MIN` will be returned if the number is `::MIN`.
fn abs(&self) -> Self;

/// The positive difference of two numbers.
Expand All @@ -176,7 +178,7 @@ pub trait Signed: Num + Neg<Self> {
/// * `-1.0` if the number is negative, `-0.0` or `NEG_INFINITY`
/// * `NaN` if the number is `NaN`
///
/// For `int`:
/// For signed integers:
///
/// * `0` if the number is zero
/// * `1` if the number is positive
Expand Down Expand Up @@ -272,6 +274,8 @@ signed_float_impl!(f64, f64::NAN, f64::INFINITY, f64::NEG_INFINITY,
/// Computes the absolute value.
///
/// For `f32` and `f64`, `NaN` will be returned if the number is `NaN`
///
/// For signed integers, `::MIN` will be returned if the number is `::MIN`.
#[inline(always)]
pub fn abs<T: Signed>(value: T) -> T {
value.abs()
Expand All @@ -294,7 +298,7 @@ pub fn abs_sub<T: Signed>(x: T, y: T) -> T {
/// * `-1.0` if the number is negative, `-0.0` or `NEG_INFINITY`
/// * `NaN` if the number is `NaN`
///
/// For int:
/// For signed integers:
///
/// * `0` if the number is zero
/// * `1` if the number is positive
Expand Down