| 1 | // Copyright 2021 The Go Authors. All rights reserved. |
|---|---|
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | package trie |
| 6 | |
| 7 | import ( |
| 8 | "strconv" |
| 9 | "sync/atomic" |
| 10 | ) |
| 11 | |
| 12 | // Scope represents a distinct collection of maps. |
| 13 | // Maps with the same Scope can be equal. Maps in different scopes are distinct. |
| 14 | // Each Builder creates maps within a unique Scope. |
| 15 | type Scope struct { |
| 16 | id int32 |
| 17 | } |
| 18 | |
| 19 | var nextScopeId int32 |
| 20 | |
| 21 | func newScope() Scope { |
| 22 | id := atomic.AddInt32(&nextScopeId, 1) |
| 23 | return Scope{id: id} |
| 24 | } |
| 25 | |
| 26 | func (s Scope) String() string { |
| 27 | return strconv.Itoa(int(s.id)) |
| 28 | } |
| 29 |