github.com/zhongdalu/gf@v1.0.0/g/container/gtype/int32.go (about)

     1  // Copyright 2018 gf Author(https://github.com/zhongdalu/gf). All Rights Reserved.
     2  //
     3  // This Source Code Form is subject to the terms of the MIT License.
     4  // If a copy of the MIT was not distributed with this file,
     5  // You can obtain one at https://github.com/zhongdalu/gf.
     6  
     7  package gtype
     8  
     9  import (
    10  	"sync/atomic"
    11  )
    12  
    13  type Int32 struct {
    14  	value int32
    15  }
    16  
    17  // NewInt32 returns a concurrent-safe object for int32 type,
    18  // with given initial value <value>.
    19  func NewInt32(value ...int32) *Int32 {
    20  	if len(value) > 0 {
    21  		return &Int32{
    22  			value: value[0],
    23  		}
    24  	}
    25  	return &Int32{}
    26  }
    27  
    28  // Clone clones and returns a new concurrent-safe object for int32 type.
    29  func (v *Int32) Clone() *Int32 {
    30  	return NewInt32(v.Val())
    31  }
    32  
    33  // Set atomically stores <value> into t.value and returns the previous value of t.value.
    34  func (v *Int32) Set(value int32) (old int32) {
    35  	return atomic.SwapInt32(&v.value, value)
    36  }
    37  
    38  // Val atomically loads t.value.
    39  func (v *Int32) Val() int32 {
    40  	return atomic.LoadInt32(&v.value)
    41  }
    42  
    43  // Add atomically adds <delta> to t.value and returns the new value.
    44  func (v *Int32) Add(delta int32) (new int32) {
    45  	return atomic.AddInt32(&v.value, delta)
    46  }
    47  
    48  // Cas executes the compare-and-swap operation for value.
    49  func (v *Int32) Cas(old, new int32) bool {
    50  	return atomic.CompareAndSwapInt32(&v.value, old, new)
    51  }