mirror of
https://gitee.com/johng/gf.git
synced 2024-12-03 04:37:49 +08:00
90 lines
2.5 KiB
Go
90 lines
2.5 KiB
Go
// 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"
|
|
)
|
|
|
|
// Float32 is a struct for concurrent-safe operation for type float32.
|
|
type Float32 struct {
|
|
value uint32
|
|
}
|
|
|
|
// NewFloat32 creates and returns a concurrent-safe object for float32 type,
|
|
// with given initial value <value>.
|
|
func NewFloat32(value ...float32) *Float32 {
|
|
if len(value) > 0 {
|
|
return &Float32{
|
|
value: math.Float32bits(value[0]),
|
|
}
|
|
}
|
|
return &Float32{}
|
|
}
|
|
|
|
// Clone clones and returns a new concurrent-safe object for float32 type.
|
|
func (v *Float32) Clone() *Float32 {
|
|
return NewFloat32(v.Val())
|
|
}
|
|
|
|
// Set atomically stores <value> into t.value and returns the previous value of t.value.
|
|
func (v *Float32) Set(value float32) (old float32) {
|
|
return math.Float32frombits(atomic.SwapUint32(&v.value, math.Float32bits(value)))
|
|
}
|
|
|
|
// Val atomically loads and returns t.value.
|
|
func (v *Float32) Val() float32 {
|
|
return math.Float32frombits(atomic.LoadUint32(&v.value))
|
|
}
|
|
|
|
// Add atomically adds <delta> to t.value and returns the new value.
|
|
func (v *Float32) Add(delta float32) (new float32) {
|
|
for {
|
|
old := math.Float32frombits(v.value)
|
|
new = old + delta
|
|
if atomic.CompareAndSwapUint32(
|
|
(*uint32)(unsafe.Pointer(&v.value)),
|
|
math.Float32bits(old),
|
|
math.Float32bits(new),
|
|
) {
|
|
break
|
|
}
|
|
}
|
|
return
|
|
}
|
|
|
|
// Cas executes the compare-and-swap operation for value.
|
|
func (v *Float32) Cas(old, new float32) (swapped bool) {
|
|
return atomic.CompareAndSwapUint32(&v.value, math.Float32bits(old), math.Float32bits(new))
|
|
}
|
|
|
|
// String implements String interface for string printing.
|
|
func (v *Float32) String() string {
|
|
return strconv.FormatFloat(float64(v.Val()), 'g', -1, 32)
|
|
}
|
|
|
|
// MarshalJSON implements the interface MarshalJSON for json.Marshal.
|
|
func (v *Float32) MarshalJSON() ([]byte, error) {
|
|
return gconv.UnsafeStrToBytes(strconv.FormatFloat(float64(v.Val()), 'g', -1, 32)), nil
|
|
}
|
|
|
|
// UnmarshalJSON implements the interface UnmarshalJSON for json.Unmarshal.
|
|
func (v *Float32) UnmarshalJSON(b []byte) error {
|
|
v.Set(gconv.Float32(gconv.UnsafeBytesToStr(b)))
|
|
return nil
|
|
}
|
|
|
|
// UnmarshalValue is an interface implement which sets any type of value for <v>.
|
|
func (v *Float32) UnmarshalValue(value interface{}) error {
|
|
v.Set(gconv.Float32(value))
|
|
return nil
|
|
}
|