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Expose tests for {f32,f64}.total_cmp in docs, along with comment

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Uncomment the assert! line and account and document that the sign
of NaN is not positive, necessarily.
This commit is contained in:
Ed Swartz 2023-08-31 09:22:03 -05:00
parent 94bc9c737e
commit 8066079b5b
2 changed files with 22 additions and 6 deletions
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14
library/core/src/num/f32.rs
View File

@ -1424,9 +1424,17 @@ impl f32 {
/// ];
///
/// bois.sort_by(|a, b| a.weight.total_cmp(&b.weight));
/// # assert!(bois.into_iter().map(|b| b.weight)
/// # .zip([-5.0, 0.1, 10.0, 99.0, f32::INFINITY, f32::NAN].iter())
/// # .all(|(a, b)| a.to_bits() == b.to_bits()))
///
/// // `f32::NAN` could be positive or negative, which will affect the sort order.
/// if f32::NAN.is_sign_negative() {
/// assert!(bois.into_iter().map(|b| b.weight)
/// .zip([f32::NAN, -5.0, 0.1, 10.0, 99.0, f32::INFINITY].iter())
/// .all(|(a, b)| a.to_bits() == b.to_bits()))
/// } else {
/// assert!(bois.into_iter().map(|b| b.weight)
/// .zip([-5.0, 0.1, 10.0, 99.0, f32::INFINITY, f32::NAN].iter())
/// .all(|(a, b)| a.to_bits() == b.to_bits()))
/// }
/// ```
#[stable(feature = "total_cmp", since = "1.62.0")]
#[must_use]

14
library/core/src/num/f64.rs
View File

@ -1422,9 +1422,17 @@ impl f64 {
/// ];
///
/// bois.sort_by(|a, b| a.weight.total_cmp(&b.weight));
/// # assert!(bois.into_iter().map(|b| b.weight)
/// # .zip([-5.0, 0.1, 10.0, 99.0, f64::INFINITY, f64::NAN].iter())
/// # .all(|(a, b)| a.to_bits() == b.to_bits()))
///
/// // `f64::NAN` could be positive or negative, which will affect the sort order.
/// if f64::NAN.is_sign_negative() {
/// assert!(bois.into_iter().map(|b| b.weight)
/// .zip([f64::NAN, -5.0, 0.1, 10.0, 99.0, f64::INFINITY].iter())
/// .all(|(a, b)| a.to_bits() == b.to_bits()))
/// } else {
/// assert!(bois.into_iter().map(|b| b.weight)
/// .zip([-5.0, 0.1, 10.0, 99.0, f64::INFINITY, f64::NAN].iter())
/// .all(|(a, b)| a.to_bits() == b.to_bits()))
/// }
/// ```
#[stable(feature = "total_cmp", since = "1.62.0")]
#[must_use]