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set_empty.go
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set_empty.go
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package lazy
import (
"github.com/arr-ai/hash"
"github.com/arr-ai/frozen"
)
type EmptySet struct{}
func (EmptySet) IsEmpty() bool {
return true
}
func (EmptySet) FastIsEmpty() (empty, ok bool) {
return true, true
}
func (EmptySet) Count() int {
return 0
}
func (EmptySet) FastCount() (count int, ok bool) {
return 0, true
}
func (EmptySet) CountUpTo(int) int {
return 0
}
func (EmptySet) FastCountUpTo(int) (count int, ok bool) {
return 0, true
}
func (EmptySet) Freeze() Set {
return Frozen(frozen.Set[any]{})
}
func (EmptySet) Equal(set any) bool {
if set, ok := set.(Set); ok {
return set.EqualSet(set)
}
return false
}
func (EmptySet) EqualSet(set Set) bool {
return set.IsEmpty()
}
func (EmptySet) Hash(seed uintptr) uintptr {
return hash.Uintptr(hashSeed, seed)
}
func (EmptySet) Has(any) bool {
return false
}
func (EmptySet) FastHas(any) (has, ok bool) {
return false, true
}
func (EmptySet) IsSubsetOf(Set) bool {
return true
}
func (EmptySet) Range() SetIterator {
return emptySetIterator{}
}
func (EmptySet) Where(Predicate) Set {
return EmptySet{}
}
func (EmptySet) With(v any) Set {
return Frozen(frozen.NewSet(v))
}
func (EmptySet) Without(any) Set {
return EmptySet{}
}
func (EmptySet) Map(Mapper) Set {
return EmptySet{}
}
func (EmptySet) Union(s Set) Set {
return s
}
func (EmptySet) Intersection(Set) Set {
return EmptySet{}
}
func (EmptySet) Difference(Set) Set {
return EmptySet{}
}
func (EmptySet) SymmetricDifference(s Set) Set {
return s
}
func (EmptySet) Powerset() Set {
return Frozen(frozen.NewSet[any](EmptySet{}))
}
type emptySetIterator struct{}
func (emptySetIterator) Next() bool {
return false
}
func (emptySetIterator) Value() any {
panic("emptySetIterator.Value(): empty set")
}