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90 lines
2.5 KiB
Go
90 lines
2.5 KiB
Go
// Copyright GoFrame Author(https://goframe.org). 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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"github.com/gogf/gf/util/gconv"
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"math"
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"strconv"
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"sync/atomic"
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"unsafe"
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)
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// Float64 is a struct for concurrent-safe operation for type float64.
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type Float64 struct {
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value uint64
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}
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// NewFloat64 creates and 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 and returns 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) (swapped bool) {
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return atomic.CompareAndSwapUint64(&v.value, math.Float64bits(old), math.Float64bits(new))
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}
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// String implements String interface for string printing.
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func (v *Float64) String() string {
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return strconv.FormatFloat(v.Val(), 'g', -1, 64)
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}
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// MarshalJSON implements the interface MarshalJSON for json.Marshal.
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func (v *Float64) MarshalJSON() ([]byte, error) {
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return gconv.UnsafeStrToBytes(strconv.FormatFloat(v.Val(), 'g', -1, 64)), nil
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}
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// UnmarshalJSON implements the interface UnmarshalJSON for json.Unmarshal.
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func (v *Float64) UnmarshalJSON(b []byte) error {
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v.Set(gconv.Float64(gconv.UnsafeBytesToStr(b)))
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return nil
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}
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// UnmarshalValue is an interface implement which sets any type of value for <v>.
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func (v *Float64) UnmarshalValue(value interface{}) error {
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v.Set(gconv.Float64(value))
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return nil
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}
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