codec_map_go111.go
720 字节
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
// Copyright 2019 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.
// +build !go1.12
package impl
import "reflect"
type mapIter struct {
v reflect.Value
keys []reflect.Value
}
// mapRange provides a less-efficient equivalent to
// the Go 1.12 reflect.Value.MapRange method.
func mapRange(v reflect.Value) *mapIter {
return &mapIter{v: v}
}
func (i *mapIter) Next() bool {
if i.keys == nil {
i.keys = i.v.MapKeys()
} else {
i.keys = i.keys[1:]
}
return len(i.keys) > 0
}
func (i *mapIter) Key() reflect.Value {
return i.keys[0]
}
func (i *mapIter) Value() reflect.Value {
return i.v.MapIndex(i.keys[0])
}