github.com/zhongdalu/gf@v1.0.0/g/container/gtype/interface.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 Interface struct {
    14  	value atomic.Value
    15  }
    16  
    17  // NewInterface returns a concurrent-safe object for interface{} type,
    18  // with given initial value <value>.
    19  func NewInterface(value ...interface{}) *Interface {
    20  	t := &Interface{}
    21  	if len(value) > 0 && value[0] != nil {
    22  		t.value.Store(value[0])
    23  	}
    24  	return t
    25  }
    26  
    27  // Clone clones and returns a new concurrent-safe object for interface{} type.
    28  func (v *Interface) Clone() *Interface {
    29  	return NewInterface(v.Val())
    30  }
    31  
    32  // Set atomically stores <value> into t.value and returns the previous value of t.value.
    33  // Note: The parameter <value> cannot be nil.
    34  func (v *Interface) Set(value interface{}) (old interface{}) {
    35  	old = v.Val()
    36  	v.value.Store(value)
    37  	return
    38  }
    39  
    40  // Val atomically loads t.value.
    41  func (v *Interface) Val() interface{} {
    42  	return v.value.Load()
    43  }