mirror of
https://github.com/golang/go
synced 2024-11-23 09:30:03 -07:00
b303fb4855
Fixes #62203 Change-Id: I0459d3f481b0cd20102f6d9fd3ea84335a7739a8 Reviewed-on: https://go-review.googlesource.com/c/go/+/522317 Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com> Reviewed-by: Keith Randall <khr@google.com> Reviewed-by: Bryan Mills <bcmills@google.com> Run-TryBot: Keith Randall <khr@golang.org> TryBot-Result: Gopher Robot <gobot@golang.org>
33 lines
688 B
Go
33 lines
688 B
Go
// 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)
|
|
}
|