mirror of
https://github.com/golang/go
synced 2024-11-15 11:30:36 -07:00
7ccddf040a
Change-Id: I64645fef0ffd1cea7c7710ec974520f85e0f7496 Reviewed-on: https://go-review.googlesource.com/c/go/+/539579 Run-TryBot: shuang cui <imcusg@gmail.com> Reviewed-by: Bryan Mills <bcmills@google.com> Reviewed-by: qiulaidongfeng <2645477756@qq.com> Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
62 lines
1.8 KiB
Go
62 lines
1.8 KiB
Go
// Copyright 2017 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package sort
|
|
|
|
import (
|
|
"internal/reflectlite"
|
|
"math/bits"
|
|
)
|
|
|
|
// Slice sorts the slice x given the provided less function.
|
|
// It panics if x is not a slice.
|
|
//
|
|
// The sort is not guaranteed to be stable: equal elements
|
|
// may be reversed from their original order.
|
|
// For a stable sort, use [SliceStable].
|
|
//
|
|
// The less function must satisfy the same requirements as
|
|
// the Interface type's Less method.
|
|
//
|
|
// Note: in many situations, the newer [slices.SortFunc] function is more
|
|
// ergonomic and runs faster.
|
|
func Slice(x any, less func(i, j int) bool) {
|
|
rv := reflectlite.ValueOf(x)
|
|
swap := reflectlite.Swapper(x)
|
|
length := rv.Len()
|
|
limit := bits.Len(uint(length))
|
|
pdqsort_func(lessSwap{less, swap}, 0, length, limit)
|
|
}
|
|
|
|
// SliceStable sorts the slice x using the provided less
|
|
// function, keeping equal elements in their original order.
|
|
// It panics if x is not a slice.
|
|
//
|
|
// The less function must satisfy the same requirements as
|
|
// the Interface type's Less method.
|
|
//
|
|
// Note: in many situations, the newer [slices.SortStableFunc] function is more
|
|
// ergonomic and runs faster.
|
|
func SliceStable(x any, less func(i, j int) bool) {
|
|
rv := reflectlite.ValueOf(x)
|
|
swap := reflectlite.Swapper(x)
|
|
stable_func(lessSwap{less, swap}, rv.Len())
|
|
}
|
|
|
|
// SliceIsSorted reports whether the slice x is sorted according to the provided less function.
|
|
// It panics if x is not a slice.
|
|
//
|
|
// Note: in many situations, the newer [slices.IsSortedFunc] function is more
|
|
// ergonomic and runs faster.
|
|
func SliceIsSorted(x any, less func(i, j int) bool) bool {
|
|
rv := reflectlite.ValueOf(x)
|
|
n := rv.Len()
|
|
for i := n - 1; i > 0; i-- {
|
|
if less(i, i-1) {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|