71030bafd8
Updates #2952. Squashed commit of the following: commit 45afcab5d33c1ec8176c0ad05423288c8770b772 Author: Ainar Garipov <A.Garipov@AdGuard.COM> Date: Tue Apr 20 15:02:34 2021 +0300 all: imp docs commit d844ce1e2bb0b92a892119161774ec95f3e59711 Author: Ainar Garipov <A.Garipov@AdGuard.COM> Date: Tue Apr 20 14:57:49 2021 +0300 all: more code imp commit eef08cb69015ead0ffaef866e12a2c6556786d37 Author: Ainar Garipov <A.Garipov@AdGuard.COM> Date: Tue Apr 20 14:52:33 2021 +0300 all: imp code, docs commit 20748f20ab9fcc410b11daf0e23eaf156dcdc7cd Author: Ainar Garipov <A.Garipov@AdGuard.COM> Date: Tue Apr 20 14:30:57 2021 +0300 all: imp dhcp host normalization, validation
72 lines
1.4 KiB
Go
72 lines
1.4 KiB
Go
package aghstrings
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// unit is a convenient alias for struct{}
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type unit = struct{}
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// Set is a set of strings.
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type Set struct {
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m map[string]unit
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}
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// NewSet returns a new string set containing strs.
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func NewSet(strs ...string) (set *Set) {
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set = &Set{
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m: make(map[string]unit, len(strs)),
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}
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for _, s := range strs {
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set.Add(s)
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}
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return set
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}
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// Add adds s to the set. Add panics if the set is a nil set, just like a nil
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// map does.
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func (set *Set) Add(s string) {
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set.m[s] = unit{}
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}
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// Del deletes s from the set. Calling Del on a nil set has no effect, just
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// like delete on an empty map doesn't.
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func (set *Set) Del(s string) {
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if set != nil {
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delete(set.m, s)
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}
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}
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// Has returns true if s is in the set. Calling Has on a nil set returns false,
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// just like indexing on an empty map does.
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func (set *Set) Has(s string) (ok bool) {
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if set != nil {
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_, ok = set.m[s]
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}
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return ok
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}
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// Len returns the length of the set. A nil set has a length of zero, just like
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// an empty map.
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func (set *Set) Len() (n int) {
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if set == nil {
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return 0
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}
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return len(set.m)
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}
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// Values returns all values in the set. The order of the values is undefined.
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// Values returns nil if the set is nil.
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func (set *Set) Values() (strs []string) {
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if set == nil {
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return nil
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}
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strs = make([]string, 0, len(set.m))
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for s := range set.m {
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strs = append(strs, s)
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}
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return strs
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}
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