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set.go
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set.go
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package uint32set
// ---------------------------------------------------------------------------
type empty struct{}
// Type is a set of uint32, implemented via map[uint32]struct{} for minimal memory consumption.
type Type map[uint32]empty
// New creates a Type from a list of values.
func New(items ...uint32) Type {
ss := Type{}
ss.Insert(items...)
return ss
}
// Add adds one item to the set.
func (s Type) Add(item uint32) {
s[item] = empty{}
}
// Insert adds items to the set.
func (s Type) Insert(items ...uint32) {
for _, item := range items {
s[item] = empty{}
}
}
// Delete removes all items from the set.
func (s Type) Delete(items ...uint32) {
for _, item := range items {
delete(s, item)
}
}
// Has returns true iff item is contained in the set.
func (s Type) Has(item uint32) bool {
_, contained := s[item]
return contained
}
// HasAll returns true iff all items are contained in the set.
func (s Type) HasAll(items ...uint32) bool {
for _, item := range items {
if !s.Has(item) {
return false
}
}
return true
}
// IsSuperset returns true iff s1 is a superset of s2.
func (s Type) IsSuperset(s2 Type) bool {
for item := range s2 {
if !s.Has(item) {
return false
}
}
return true
}
// Len returns the size of the set.
func (s Type) Len() int {
return len(s)
}
// ---------------------------------------------------------------------------