1// Copyright (c) 2020 Uber Technologies, Inc. 2// 3// Permission is hereby granted, free of charge, to any person obtaining a copy 4// of this software and associated documentation files (the "Software"), to deal 5// in the Software without restriction, including without limitation the rights 6// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 7// copies of the Software, and to permit persons to whom the Software is 8// furnished to do so, subject to the following conditions: 9// 10// The above copyright notice and this permission notice shall be included in 11// all copies or substantial portions of the Software. 12// 13// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 14// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 15// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 16// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 17// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 18// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 19// THE SOFTWARE. 20 21package atomic 22 23// atomic.Value panics on nil inputs, or if the underlying type changes. 24// Stabilize by always storing a custom struct that we control. 25 26//go:generate bin/gen-atomicwrapper -name=Error -type=error -wrapped=Value -pack=packError -unpack=unpackError -file=error.go 27 28type packedError struct{ Value error } 29 30func packError(v error) interface{} { 31 return packedError{v} 32} 33 34func unpackError(v interface{}) error { 35 if err, ok := v.(packedError); ok { 36 return err.Value 37 } 38 return nil 39} 40