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golang如何实现静态变量的效果

妙音 posted @ 2021年4月24日 20:46 in golang , 2254 阅读
 

说明

 
go的结构和方法接收者, 可以模拟类的概念, 然而go不支持静态变量
 
不能总是每次先创建一个结构体, 然后获取变量吧
 
该如何办？
 
 

如何创建"类"

 
先展示一下，平时我是如何创建"类"的
 
1.私有的结构体作为真实对象
 
2. 对外暴露方法，这个方法类似class可以作为参数传递，使用这个class就可以创建对象
 
3. BaseVar定义对外暴露的接口
 
4. 定义方法的interface，方便作为参数传递
 
type BaseVar interface {
    //对外暴露的接口
}

//方便传递
type VarDecriptor func(params ...interface{}) BaseVar

//等同于类
func VarBinary(params ...interface{}) BaseVar {
s := &varBinary{
FormatCode: 0o10,
TextCode: "B",
PreferredTypes: []reflect.Kind{reflect.Uint8, reflect.Slice},
}
return s
}

//实质上的对象
type varBinary struct{
BaseVar   //外部接口
FormatCode int
TextCode string
PreferredTypes  []reflect.Kind //bytes bytearray
value           []byte
}
 

静态变量有何意义

 
关联常量与类
 

解决方法

 
定义全局变量，以"类"名作为key，存放静态变量。runtime能动态获取"类"名，通过"类"名取值。
 
var gFormatCode = map[string]int{
"VarBinary": 1,
}

func FormatCode(f VarDecriptor) int {
    //取方法名
fname := runtime.FuncForPC(reflect.ValueOf(fc).Pointer()).Name()
names := strings.Split(fname, ".")
funcName := names[1]
    //从全局变量中取值
return gFormatCode[funcName]
}

//使用时通过FormatCode，传入上面的VarBinary，就可以获取常量
 
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