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// Copyright 2019 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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//go:build !go1.12 |
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// +build !go1.12 |
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package impl |
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import "reflect" |
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type mapIter struct { |
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v reflect.Value |
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keys []reflect.Value |
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} |
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// mapRange provides a less-efficient equivalent to |
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// the Go 1.12 reflect.Value.MapRange method. |
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func mapRange(v reflect.Value) *mapIter { |
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return &mapIter{v: v} |
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} |
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func (i *mapIter) Next() bool { |
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if i.keys == nil { |
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i.keys = i.v.MapKeys() |
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} else { |
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i.keys = i.keys[1:] |
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} |
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return len(i.keys) > 0 |
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} |
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func (i *mapIter) Key() reflect.Value { |
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return i.keys[0] |
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} |
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func (i *mapIter) Value() reflect.Value { |
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return i.v.MapIndex(i.keys[0]) |
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} |