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| author | John Giorshev <johngiorshev@gmail.com> | 2025-07-06 18:41:28 +0000 |
|---|---|---|
| committer | Gopher Robot <gobot@golang.org> | 2025-07-07 09:13:08 -0700 |
| commit | a995269a9383d90a3bdd029989bafc8fc3b19dc3 (patch) | |
| tree | 8d25fd7d382847b25636f504f44e433d6b7d011f /src | |
| parent | 6c3b5a2798c83d583cb37dba9f39c47300d19f1f (diff) | |
| download | go-a995269a9383d90a3bdd029989bafc8fc3b19dc3.tar.xz | |
sort: clarify Less doc
clarifies the requirements for Less
Fixes https://github.com/golang/go/issues/73420
Change-Id: I7d49b10fad78c618d946b3bb161ce19680ede47a
GitHub-Last-Rev: 7a49ad81923048bfc99b265dd89f012eefcf5699
GitHub-Pull-Request: golang/go#74333
Reviewed-on: https://go-review.googlesource.com/c/go/+/683275
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Keith Randall <khr@google.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Diffstat (limited to 'src')
| -rw-r--r-- | src/sort/sort.go | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/src/sort/sort.go b/src/sort/sort.go index b27ecabdd5..fd3cd6dabf 100644 --- a/src/sort/sort.go +++ b/src/sort/sort.go @@ -26,13 +26,15 @@ type Interface interface { // Sort may place equal elements in any order in the final result, // while Stable preserves the original input order of equal elements. // - // Less must describe a transitive ordering: + // Less must describe a [Strict Weak Ordering]. For example: // - if both Less(i, j) and Less(j, k) are true, then Less(i, k) must be true as well. // - if both Less(i, j) and Less(j, k) are false, then Less(i, k) must be false as well. // // Note that floating-point comparison (the < operator on float32 or float64 values) - // is not a transitive ordering when not-a-number (NaN) values are involved. + // is not a strict weak ordering when not-a-number (NaN) values are involved. // See Float64Slice.Less for a correct implementation for floating-point values. + // + // [Strict Weak Ordering]: https://en.wikipedia.org/wiki/Weak_ordering#Strict_weak_orderings Less(i, j int) bool // Swap swaps the elements with indexes i and j. |