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// Copyright (c) Tailscale Inc & contributors
// 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.
type Handle struct {
v *byte
}
// NewHandle returns a new handle value.
func NewHandle() Handle {
return Handle{new(byte)}
}
// Add adds the element (map value) e to the set.
//
// It returns a new handle (map key) with which e can be removed, using a map
// delete or the [HandleSet.Delete] method.
func (s *HandleSet[T]) Add(e T) Handle {
h := NewHandle()
if *s == nil {
*s = make(HandleSet[T])
}
(*s)[h] = e
return h
}
// Delete removes the element with handle h from the set.
func (s HandleSet[T]) Delete(h Handle) { delete(s, h) }
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