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cmd/cloner,*: optimize nillable slice cloner

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A wild @josharian appears with a good suggestion for a refactor, thanks
Josh!

Updates #9410
Signed-off-by: James Tucker <james@tailscale.com>
This commit is contained in:
James Tucker
2023-09-29 17:29:17 -07:00
committed by James Tucker
parent e91e96dfa5
commit ee90cd02fd
5 changed files with 34 additions and 58 deletions
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32
cmd/viewer/tests/tests_clone.go
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@@ -136,29 +136,21 @@ func (src *StructWithSlices) Clone() *StructWithSlices {
dst := new(StructWithSlices)
*dst = *src
dst.Values = append(src.Values[:0:0], src.Values...)
if src.ValuePointers != nil {
dst.ValuePointers = make([]*StructWithoutPtrs, len(src.ValuePointers))
for i := range dst.ValuePointers {
dst.ValuePointers[i] = src.ValuePointers[i].Clone()
}
dst.ValuePointers = append([]*StructWithoutPtrs(nil), make([]*StructWithoutPtrs, len(src.ValuePointers))...)
for i := range dst.ValuePointers {
dst.ValuePointers[i] = src.ValuePointers[i].Clone()
}
if src.StructPointers != nil {
dst.StructPointers = make([]*StructWithPtrs, len(src.StructPointers))
for i := range dst.StructPointers {
dst.StructPointers[i] = src.StructPointers[i].Clone()
}
dst.StructPointers = append([]*StructWithPtrs(nil), make([]*StructWithPtrs, len(src.StructPointers))...)
for i := range dst.StructPointers {
dst.StructPointers[i] = src.StructPointers[i].Clone()
}
if src.Structs != nil {
dst.Structs = make([]StructWithPtrs, len(src.Structs))
for i := range dst.Structs {
dst.Structs[i] = *src.Structs[i].Clone()
}
dst.Structs = append([]StructWithPtrs(nil), make([]StructWithPtrs, len(src.Structs))...)
for i := range dst.Structs {
dst.Structs[i] = *src.Structs[i].Clone()
}
if src.Ints != nil {
dst.Ints = make([]*int, len(src.Ints))
for i := range dst.Ints {
dst.Ints[i] = ptr.To(*src.Ints[i])
}
dst.Ints = append([]*int(nil), make([]*int, len(src.Ints))...)
for i := range dst.Ints {
dst.Ints[i] = ptr.To(*src.Ints[i])
}
dst.Slice = append(src.Slice[:0:0], src.Slice...)
dst.Prefixes = append(src.Prefixes[:0:0], src.Prefixes...)