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443f7d59f9
- Add a new `Seq` function to the `Set` type, this returns an iterator over the values. - Convert some users of the `Values` method to allow for more optimal code. Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/6676 Reviewed-by: Earl Warren <earl-warren@noreply.codeberg.org> Co-authored-by: Gusted <postmaster@gusted.xyz> Co-committed-by: Gusted <postmaster@gusted.xyz>
76 lines
1.6 KiB
Go
76 lines
1.6 KiB
Go
// Copyright 2022 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package container
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import (
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"iter"
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"maps"
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)
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type Set[T comparable] map[T]struct{}
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// SetOf creates a set and adds the specified elements to it.
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func SetOf[T comparable](values ...T) Set[T] {
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s := make(Set[T], len(values))
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s.AddMultiple(values...)
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return s
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}
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// Add adds the specified element to a set.
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// Returns true if the element is added; false if the element is already present.
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func (s Set[T]) Add(value T) bool {
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if _, has := s[value]; !has {
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s[value] = struct{}{}
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return true
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}
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return false
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}
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// AddMultiple adds the specified elements to a set.
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func (s Set[T]) AddMultiple(values ...T) {
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for _, value := range values {
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s.Add(value)
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}
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}
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func (s Set[T]) IsSubset(subset []T) bool {
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for _, v := range subset {
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if !s.Contains(v) {
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return false
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}
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}
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return true
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}
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// Contains determines whether a set contains the specified element.
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// Returns true if the set contains the specified element; otherwise, false.
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func (s Set[T]) Contains(value T) bool {
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_, has := s[value]
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return has
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}
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// Remove removes the specified element.
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// Returns true if the element is successfully found and removed; otherwise, false.
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func (s Set[T]) Remove(value T) bool {
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if _, has := s[value]; has {
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delete(s, value)
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return true
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}
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return false
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}
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// Values gets a list of all elements in the set.
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func (s Set[T]) Values() []T {
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keys := make([]T, 0, len(s))
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for k := range s {
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keys = append(keys, k)
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}
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return keys
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}
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// Seq returns a iterator over the elements in the set.
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// It returns a single-use iterator.
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func (s Set[T]) Seq() iter.Seq[T] {
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return maps.Keys(s)
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}
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