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maps: clarify iteration order and insertion behavior 

Fixes #67537.

Change-Id: Ic567f7d19d621a17d2a00aba5b9f927001195ea9
GitHub-Last-Rev: 9eec790ab6
GitHub-Pull-Request: golang/go#67539
Reviewed-on: https://go-review.googlesource.com/c/go/+/587015
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
This commit is contained in:
aimuz 2024-05-22 01:30:42 +00:00 committed by Gopher Robot
parent 16ab55f07f
commit 33496c2dd3
1 changed files with 7 additions and 0 deletions
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7
src/maps/iter.go
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@ -7,6 +7,8 @@ package maps
import "iter"
// All returns an iterator over key-value pairs from m.
// The iteration order is not specified and is not guaranteed
// to be the same from one call to the next.
func All[Map ~map[K]V, K comparable, V any](m Map) iter.Seq2[K, V] {
return func(yield func(K, V) bool) {
for k, v := range m {
@ -18,6 +20,8 @@ func All[Map ~map[K]V, K comparable, V any](m Map) iter.Seq2[K, V] {
}
// Keys returns an iterator over keys in m.
// The iteration order is not specified and is not guaranteed
// to be the same from one call to the next.
func Keys[Map ~map[K]V, K comparable, V any](m Map) iter.Seq[K] {
return func(yield func(K) bool) {
for k := range m {
@ -29,6 +33,8 @@ func Keys[Map ~map[K]V, K comparable, V any](m Map) iter.Seq[K] {
}
// Values returns an iterator over values in m.
// The iteration order is not specified and is not guaranteed
// to be the same from one call to the next.
func Values[Map ~map[K]V, K comparable, V any](m Map) iter.Seq[V] {
return func(yield func(V) bool) {
for _, v := range m {
@ -40,6 +46,7 @@ func Values[Map ~map[K]V, K comparable, V any](m Map) iter.Seq[V] {
}
// Insert adds the key-value pairs from seq to m.
// If a key in seq already exists in m, its value will be overwritten.
func Insert[Map ~map[K]V, K comparable, V any](m Map, seq iter.Seq2[K, V]) {
for k, v := range seq {
m[k] = v