mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-09-21 19:10:01 +00:00
73 lines
1.9 KiB
Go
73 lines
1.9 KiB
Go
// GoToSocial
|
|
// Copyright (C) GoToSocial Authors admin@gotosocial.org
|
|
// SPDX-License-Identifier: AGPL-3.0-or-later
|
|
//
|
|
// This program is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Affero General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// This program is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Affero General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Affero General Public License
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package util
|
|
|
|
// Set represents a hashmap of only keys,
|
|
// useful for deduplication / key checking.
|
|
type Set[T comparable] map[T]struct{}
|
|
|
|
// ToSet creates a Set[T] from given values,
|
|
// noting that this does not maintain any order.
|
|
func ToSet[T comparable](in []T) Set[T] {
|
|
set := make(Set[T], len(in))
|
|
for _, v := range in {
|
|
set[v] = struct{}{}
|
|
}
|
|
return set
|
|
}
|
|
|
|
// FromSet extracts the values from set to slice,
|
|
// noting that this does not maintain any order.
|
|
func FromSet[T comparable](in Set[T]) []T {
|
|
out := make([]T, len(in))
|
|
var i int
|
|
for v := range in {
|
|
out[i] = v
|
|
i++
|
|
}
|
|
return out
|
|
}
|
|
|
|
// In returns input slice filtered to
|
|
// only contain those in receiving set.
|
|
func (s Set[T]) In(vs []T) []T {
|
|
out := make([]T, 0, len(vs))
|
|
for _, v := range vs {
|
|
if _, ok := s[v]; ok {
|
|
out = append(out, v)
|
|
}
|
|
}
|
|
return out
|
|
}
|
|
|
|
// NotIn is the functional inverse of In().
|
|
func (s Set[T]) NotIn(vs []T) []T {
|
|
out := make([]T, 0, len(vs))
|
|
for _, v := range vs {
|
|
if _, ok := s[v]; !ok {
|
|
out = append(out, v)
|
|
}
|
|
}
|
|
return out
|
|
}
|
|
|
|
// Has returns if value is in Set.
|
|
func (s Set[T]) Has(v T) bool {
|
|
_, ok := s[v]
|
|
return ok
|
|
}
|