| // run |
| |
| // Copyright 2023 The Go 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 main |
| |
| import ( |
| "fmt" |
| "maps" |
| ) |
| |
| func main() { |
| m := map[string]struct{}{} |
| |
| // Fill m up to the max for 4 buckets = 48 entries. |
| for i := 0; i < 48; i++ { |
| m[fmt.Sprintf("%d", i)] = struct{}{} |
| } |
| |
| // Add a 49th entry, to start a grow to 8 buckets. |
| m["foo"] = struct{}{} |
| |
| // Remove that 49th entry. m is still growing to 8 buckets, |
| // but a clone of m will only have 4 buckets because it |
| // only needs to fit 48 entries. |
| delete(m, "foo") |
| |
| // Clone an 8-bucket map to a 4-bucket map. |
| _ = maps.Clone(m) |
| } |
