golang 服务或结构体可选参数的赋值

Posted 2022-11-18 share-ideas

// 服务结构体
type Server struct 
    opts options //可选参数变量
    addr string


//可选参数列表
type options struct 
    A int
    B string
    C bool
    D int


// 为可选参数赋值的函数
type ServerOption func(*options)

func Afunc(a int) ServerOption 
    return func(o *options) 
        o.A = a
    

func Bfunc(b string) ServerOption 
    return func(o *options) 
        o.B = b
    

func Cfunc(c bool) ServerOption 
    return func(o *options) 
        o.C = c
    


//新建服务
func NewServer(addr string, opt ....ServerOption) *Server 
    var opts options
    for _, o := opt 
        o(&options)
    
    
    return &Server
        opts: opts,
        addr: addr,
    

// 实例说明
server := NewServer("aaaa", Afunc(1), Cfunc(true))