25 lines
801 B
Go
25 lines
801 B
Go
// Copyright 2017, 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.md file.
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// +build !purego
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package cmp
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import (
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"reflect"
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"unsafe"
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)
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const supportExporters = true
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// retrieveUnexportedField uses unsafe to forcibly retrieve any field from
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// a struct such that the value has read-write permissions.
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//
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// The parent struct, v, must be addressable, while f must be a StructField
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// describing the field to retrieve.
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func retrieveUnexportedField(v reflect.Value, f reflect.StructField) reflect.Value {
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// See https://github.com/google/go-cmp/issues/167 for discussion of the
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// following expression.
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return reflect.NewAt(f.Type, unsafe.Pointer(uintptr(unsafe.Pointer(v.UnsafeAddr()))+f.Offset)).Elem()
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}
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