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Make a couple of other Set API functions nil-safe

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This commit is contained in:
Kovid Goyal
2023-09-12 15:37:24 +05:30
parent 2d7bbf60cc
commit 93618842ae
1 changed files with 4 additions and 1 deletions
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5
tools/utils/set.go
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@@ -84,7 +84,7 @@ func (self *Set[T]) Intersect(other *Set[T]) (ans *Set[T]) {
func (self *Set[T]) Subtract(other *Set[T]) (ans *Set[T]) {
ans = NewSet[T](self.Len())
for x := range self.items {
if !other.Has(x) {
if other == nil || !other.Has(x) {
ans.items[x] = struct{}{}
}
}
@@ -92,6 +92,9 @@ func (self *Set[T]) Subtract(other *Set[T]) (ans *Set[T]) {
}
func (self *Set[T]) IsSubsetOf(other *Set[T]) bool {
if other == nil {
return self.Len() == 0
}
for x := range self.items {
if !other.Has(x) {
return false