| // 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]) |
| } |
