67vc33-b1a78eb8b39a7a2f.ithost.pongsawadi.ac.th

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/usr/share/go-1.22/src/reflect/

Edit File: swapper.go

// Copyright 2016 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 reflect

import (
	"internal/abi"
	"internal/goarch"
	"internal/unsafeheader"
	"unsafe"
)

// Swapper returns a function that swaps the elements in the provided
// slice.
//
// Swapper panics if the provided interface is not a slice.
func Swapper(slice any) func(i, j int) {
	v := ValueOf(slice)
	if v.Kind() != Slice {
		panic(&ValueError{Method: "Swapper", Kind: v.Kind()})
	}
	// Fast path for slices of size 0 and 1. Nothing to swap.
	switch v.Len() {
	case 0:
		return func(i, j int) { panic("reflect: slice index out of range") }
	case 1:
		return func(i, j int) {
			if i != 0 || j != 0 {
				panic("reflect: slice index out of range")
			}
		}
	}

typ := v.Type().Elem().common()
	size := typ.Size()
	hasPtr := typ.PtrBytes != 0

// Some common & small cases, without using memmove:
	if hasPtr {
		if size == goarch.PtrSize {
			ps := *(*[]unsafe.Pointer)(v.ptr)
			return func(i, j int) { ps[i], ps[j] = ps[j], ps[i] }
		}
		if typ.Kind() == abi.String {
			ss := *(*[]string)(v.ptr)
			return func(i, j int) { ss[i], ss[j] = ss[j], ss[i] }
		}
	} else {
		switch size {
		case 8:
			is := *(*[]int64)(v.ptr)
			return func(i, j int) { is[i], is[j] = is[j], is[i] }
		case 4:
			is := *(*[]int32)(v.ptr)
			return func(i, j int) { is[i], is[j] = is[j], is[i] }
		case 2:
			is := *(*[]int16)(v.ptr)
			return func(i, j int) { is[i], is[j] = is[j], is[i] }
		case 1:
			is := *(*[]int8)(v.ptr)
			return func(i, j int) { is[i], is[j] = is[j], is[i] }
		}
	}

s := (*unsafeheader.Slice)(v.ptr)
	tmp := unsafe_New(typ) // swap scratch space

return func(i, j int) {
		if uint(i) >= uint(s.Len) || uint(j) >= uint(s.Len) {
			panic("reflect: slice index out of range")
		}
		val1 := arrayAt(s.Data, i, size, "i < s.Len")
		val2 := arrayAt(s.Data, j, size, "j < s.Len")
		typedmemmove(typ, tmp, val1)
		typedmemmove(typ, val1, val2)
		typedmemmove(typ, val2, tmp)
	}
}

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Listing directory:

Name	Size	Modify	Owner/Group	Perms	Action	Select
abi.go	15.02 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
abi_test.go	26.39 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
all_test.go	214.57 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
arena.go	570 B	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
asm_386.s	1.07 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
asm_amd64.s	2.76 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
asm_arm.s	1.13 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
asm_arm64.s	2.77 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
asm_loong64.s	2.87 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
asm_mips64x.s	1.16 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
asm_mipsx.s	1.16 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
asm_ppc64x.s	3.31 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
asm_riscv64.s	2.58 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
asm_s390x.s	1.1 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
asm_wasm.s	1.15 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
benchmark_test.go	8.82 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
deepequal.go	7.42 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
example_test.go	4.53 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
export_test.go	3.73 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
float32reg_generic.go	681 B	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
float32reg_ppc64x.s	838 B	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
float32reg_riscv64.s	794 B	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
internal	DIR	29.06.2025 20:01:22	0/0	drwxr-xr-x	Edit Rename
makefunc.go	5.91 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
nih_test.go	1004 B	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
set_test.go	5.71 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
stubs_ppc64x.go	292 B	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
stubs_riscv64.go	263 B	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
swapper.go	2 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
tostring_test.go	2.14 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
type.go	80.47 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
type_test.go	1.26 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
value.go	118.95 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
visiblefields.go	2.97 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
visiblefields_test.go	5.27 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download

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