// 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])

}