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reflect: add SetLen()

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This commit is contained in:
Damian Gryski
2023-02-28 09:54:39 -08:00
committed by Damian Gryski
parent e4ef6f85ac
commit 960a0b79bf
2 changed files with 24 additions and 3 deletions
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src/reflect/value_test.go
+15 -2
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@@ -137,7 +137,7 @@ func TestSlice(t *testing.T) {
s28ref := refs.Slice(2, 8)
if len(s28) != s28ref.Len() || cap(s28) != s28ref.Cap() {
t.Errorf("len(s28)=%d s28ref.Len()=%d cap(s28)=%d s28ref.Cap()=%d\n", len(s28), s28ref.Len(), cap(s28), s28ref.Cap())
t.Errorf("Slice: len(s28)=%d s28ref.Len()=%d cap(s28)=%d s28ref.Cap()=%d\n", len(s28), s28ref.Len(), cap(s28), s28ref.Cap())
}
for i, got := range s28 {
@@ -151,7 +151,7 @@ func TestSlice(t *testing.T) {
s268ref := refs.Slice3(2, 6, 8)
if len(s268) != s268ref.Len() || cap(s268) != s268ref.Cap() {
t.Errorf("len(s268)=%d s268ref.Len()=%d cap(s268)=%d s268ref.Cap()=%d\n", len(s268), s268ref.Len(), cap(s268), s268ref.Cap())
t.Errorf("Slice3: len(s268)=%d s268ref.Len()=%d cap(s268)=%d s268ref.Cap()=%d\n", len(s268), s268ref.Len(), cap(s268), s268ref.Cap())
}
for i, got := range s268 {
@@ -161,6 +161,19 @@ func TestSlice(t *testing.T) {
}
}
// should be equivalent to s28 now, except for the capacity which doesn't change
s268ref.SetLen(6)
if len(s28) != s268ref.Len() || cap(s268) != s268ref.Cap() {
t.Errorf("SetLen: len(s268)=%d s268ref.Len()=%d cap(s268)=%d s268ref.Cap()=%d\n", len(s28), s268ref.Len(), cap(s268), s268ref.Cap())
}
for i, got := range s28 {
want := int(s268ref.Index(i).Int())
if got != want {
t.Errorf("s28[%d]=%d, want %d", i, got, want)
}
}
refs = MakeSlice(TypeOf(s), 5, 10)
s = refs.Interface().([]int)