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// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
package set
// HandleSet is a set of T.
//
// It is not safe for concurrent use.
type HandleSet[T any] map[Handle]T
// Handle is an 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
}
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