/
float64.go
89 lines (76 loc) · 2.48 KB
/
float64.go
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// Copyright 2018 gf Author(https://github.com/gogf/gf). All Rights Reserved.
//
// This Source Code Form is subject to the terms of the MIT License.
// If a copy of the MIT was not distributed with this file,
// You can obtain one at https://github.com/gogf/gf.
package gtype
import (
"github.com/gogf/gf/util/gconv"
"math"
"strconv"
"sync/atomic"
"unsafe"
)
// Float64 is a struct for concurrent-safe operation for type float64.
type Float64 struct {
value uint64
}
// NewFloat64 creates and returns a concurrent-safe object for float64 type,
// with given initial value <value>.
func NewFloat64(value ...float64) *Float64 {
if len(value) > 0 {
return &Float64{
value: math.Float64bits(value[0]),
}
}
return &Float64{}
}
// Clone clones and returns a new concurrent-safe object for float64 type.
func (v *Float64) Clone() *Float64 {
return NewFloat64(v.Val())
}
// Set atomically stores <value> into t.value and returns the previous value of t.value.
func (v *Float64) Set(value float64) (old float64) {
return math.Float64frombits(atomic.SwapUint64(&v.value, math.Float64bits(value)))
}
// Val atomically loads and returns t.value.
func (v *Float64) Val() float64 {
return math.Float64frombits(atomic.LoadUint64(&v.value))
}
// Add atomically adds <delta> to t.value and returns the new value.
func (v *Float64) Add(delta float64) (new float64) {
for {
old := math.Float64frombits(v.value)
new = old + delta
if atomic.CompareAndSwapUint64(
(*uint64)(unsafe.Pointer(&v.value)),
math.Float64bits(old),
math.Float64bits(new),
) {
break
}
}
return
}
// Cas executes the compare-and-swap operation for value.
func (v *Float64) Cas(old, new float64) (swapped bool) {
return atomic.CompareAndSwapUint64(&v.value, math.Float64bits(old), math.Float64bits(new))
}
// String implements String interface for string printing.
func (v *Float64) String() string {
return strconv.FormatFloat(v.Val(), 'g', -1, 64)
}
// MarshalJSON implements the interface MarshalJSON for json.Marshal.
func (v *Float64) MarshalJSON() ([]byte, error) {
return gconv.UnsafeStrToBytes(strconv.FormatFloat(v.Val(), 'g', -1, 64)), nil
}
// UnmarshalJSON implements the interface UnmarshalJSON for json.Unmarshal.
func (v *Float64) UnmarshalJSON(b []byte) error {
v.Set(gconv.Float64(gconv.UnsafeBytesToStr(b)))
return nil
}
// UnmarshalValue is an interface implement which sets any type of value for <v>.
func (v *Float64) UnmarshalValue(value interface{}) error {
v.Set(gconv.Float64(value))
return nil
}