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tailscale/util/set/set.go

31 lines
768 B
Go

// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package set contains set types.
package set
// HandleSet is a set of T.
//
// It is not safe for concurrent use.
type HandleSet[T any] map[Handle]T
// Handle is a opaque comparable value that's used as the map key
// in a HandleSet. The only way to get one is to call HandleSet.Add.
type Handle struct {
v *byte
}
// Add adds the element (map value) e to the set.
//
// It returns the handle (map key) with which e can be removed, using a map
// delete.
func (s *HandleSet[T]) Add(e T) Handle {
h := Handle{new(byte)}
if *s == nil {
*s = make(HandleSet[T])
}
(*s)[h] = e
return h
}