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65 lines
1.6 KiB
Go
65 lines
1.6 KiB
Go
// Copyright 2018 gf Author(https://github.com/gogf/gf). All Rights Reserved.
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//
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// This Source Code Form is subject to the terms of the MIT License.
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// If a copy of the MIT was not distributed with this file,
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// You can obtain one at https://github.com/gogf/gf.
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package gtype
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import (
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"math"
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"sync/atomic"
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"unsafe"
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)
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type Float64 struct {
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value uint64
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}
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// NewFloat64 returns a concurrent-safe object for float64 type,
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// with given initial value <value>.
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func NewFloat64(value ...float64) *Float64 {
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if len(value) > 0 {
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return &Float64{
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value: math.Float64bits(value[0]),
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}
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}
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return &Float64{}
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}
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// Clone clones and returns a new concurrent-safe object for float64 type.
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func (v *Float64) Clone() *Float64 {
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return NewFloat64(v.Val())
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}
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// Set atomically stores <value> into t.value and returns the previous value of t.value.
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func (v *Float64) Set(value float64) (old float64) {
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return math.Float64frombits(atomic.SwapUint64(&v.value, math.Float64bits(value)))
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}
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// Val atomically loads t.value.
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func (v *Float64) Val() float64 {
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return math.Float64frombits(atomic.LoadUint64(&v.value))
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}
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// Add atomically adds <delta> to t.value and returns the new value.
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func (v *Float64) Add(delta float64) (new float64) {
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for {
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old := math.Float64frombits(v.value)
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new = old + delta
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if atomic.CompareAndSwapUint64(
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(*uint64)(unsafe.Pointer(&v.value)),
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math.Float64bits(old),
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math.Float64bits(new),
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) {
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break
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}
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}
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return
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}
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// Cas executes the compare-and-swap operation for value.
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func (v *Float64) Cas(old, new float64) bool {
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return atomic.CompareAndSwapUint64(&v.value, uint64(old), uint64(new))
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}
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