1// @generated Code generated by gen-atomicwrapper. 2 3// Copyright (c) 2020 Uber Technologies, Inc. 4// 5// Permission is hereby granted, free of charge, to any person obtaining a copy 6// of this software and associated documentation files (the "Software"), to deal 7// in the Software without restriction, including without limitation the rights 8// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9// copies of the Software, and to permit persons to whom the Software is 10// furnished to do so, subject to the following conditions: 11// 12// The above copyright notice and this permission notice shall be included in 13// all copies or substantial portions of the Software. 14// 15// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 21// THE SOFTWARE. 22 23package atomic 24 25import ( 26 "encoding/json" 27 "math" 28) 29 30// Float64 is an atomic type-safe wrapper for float64 values. 31type Float64 struct { 32 _ nocmp // disallow non-atomic comparison 33 34 v Uint64 35} 36 37var _zeroFloat64 float64 38 39// NewFloat64 creates a new Float64. 40func NewFloat64(v float64) *Float64 { 41 x := &Float64{} 42 if v != _zeroFloat64 { 43 x.Store(v) 44 } 45 return x 46} 47 48// Load atomically loads the wrapped float64. 49func (x *Float64) Load() float64 { 50 return math.Float64frombits(x.v.Load()) 51} 52 53// Store atomically stores the passed float64. 54func (x *Float64) Store(v float64) { 55 x.v.Store(math.Float64bits(v)) 56} 57 58// CAS is an atomic compare-and-swap for float64 values. 59func (x *Float64) CAS(o, n float64) bool { 60 return x.v.CAS(math.Float64bits(o), math.Float64bits(n)) 61} 62 63// MarshalJSON encodes the wrapped float64 into JSON. 64func (x *Float64) MarshalJSON() ([]byte, error) { 65 return json.Marshal(x.Load()) 66} 67 68// UnmarshalJSON decodes a float64 from JSON. 69func (x *Float64) UnmarshalJSON(b []byte) error { 70 var v float64 71 if err := json.Unmarshal(b, &v); err != nil { 72 return err 73 } 74 x.Store(v) 75 return nil 76} 77