mirror of
https://github.com/golang/go
synced 2024-11-23 15:20:03 -07:00
231f290e51
So iterators that are in progress can know entries have been deleted and terminate the iterator properly. Update #55002 Update #56351 Fixes #59411 Change-Id: I924f16a00fe4ed6564f730a677348a6011d3fb67 Reviewed-on: https://go-review.googlesource.com/c/go/+/481935 Reviewed-by: Keith Randall <khr@golang.org> Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com> Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com> Reviewed-by: Michael Knyszek <mknyszek@google.com> Reviewed-by: Keith Randall <khr@google.com> TryBot-Result: Gopher Robot <gobot@golang.org>
78 lines
1.3 KiB
Go
78 lines
1.3 KiB
Go
// run
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// Copyright 2023 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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import (
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"math"
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"reflect"
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)
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func main() {
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for i := 0; i < 100; i++ {
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f()
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g()
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}
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}
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func f() {
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// Allocate map.
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m := map[float64]int{}
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// Fill to just before a growth trigger.
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const N = 13 << 4 // 6.5 * 2 * 2^k
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for i := 0; i < N; i++ {
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m[math.NaN()] = i
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}
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// Trigger growth.
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m[math.NaN()] = N
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// Iterate through map.
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i := 0
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for range m {
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if i == 6 {
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// Partway through iteration, clear the map.
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clear(m)
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} else if i > 6 {
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// If we advance to the next iteration, that's a bug.
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panic("BAD")
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}
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i++
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}
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if len(m) != 0 {
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panic("clear did not empty the map")
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}
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}
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func g() {
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// Allocate map.
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m := map[float64]int{}
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// Fill to just before a growth trigger.
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const N = 13 << 4 // 6.5 * 2 * 2^k
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for i := 0; i < N; i++ {
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m[math.NaN()] = i
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}
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// Trigger growth.
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m[math.NaN()] = N
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// Iterate through map.
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i := 0
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v := reflect.ValueOf(m)
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iter := v.MapRange()
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for iter.Next() {
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if i == 6 {
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// Partway through iteration, clear the map.
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v.Clear()
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} else if i > 6 {
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// If we advance to the next iteration, that's a bug.
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panic("BAD")
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}
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i++
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}
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if v.Len() != 0 {
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panic("clear did not empty the map")
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}
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}
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