gf/container/gtype/interface.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 (
	"encoding/json"
	"sync/atomic"
)

type Interface struct {
	value atomic.Value
}

// NewInterface returns a concurrent-safe object for interface{} type,
// with given initial value <value>.
func NewInterface(value ...interface{}) *Interface {
	t := &Interface{}
	if len(value) > 0 && value[0] != nil {
		t.value.Store(value[0])
	}
	return t
}

// Clone clones and returns a new concurrent-safe object for interface{} type.
func (v *Interface) Clone() *Interface {
	return NewInterface(v.Val())
}

// Set atomically stores <value> into t.value and returns the previous value of t.value.
// Note: The parameter <value> cannot be nil.
func (v *Interface) Set(value interface{}) (old interface{}) {
	old = v.Val()
	v.value.Store(value)
	return
}

// Val atomically loads t.value.
func (v *Interface) Val() interface{} {
	return v.value.Load()
}

// MarshalJSON implements the interface MarshalJSON for json.Marshal.
func (v *Interface) MarshalJSON() ([]byte, error) {
	return json.Marshal(v.Val())
}