golang设计模式之选项模式

type Options struct {
   StrOption1 string
   StrOption2 string
   StrOption3 string
   IntOption1 int
   IntOption2 int
   IntOption3 int
}

type Option func(opts *Options)

func InitOption3(opts ...Option) {
    options := &Options{}
    for _, opt := range opts {
        opt(options)
    }

    fmt.Printf("init options3:%#v
", options)
}

func WithStringOption1(str string) Option {
    return func(opts *Options) {
        opts.StrOption1 = str
    }
}

func WithStringOption2(str string) Option {
    return func(opts *Options) {
        opts.StrOption2 = str
    }
}

func WithStringOption3(str string) Option {
    return func(opts *Options) {
        opts.StrOption3 = str
    }
}

func WithIntOption1(val int) Option {
    return func(opts *Options) {
        opts.IntOption1 = val
    }
}

func WithIntOption2(val int) Option {
    return func(opts *Options) {
        opts.IntOption2 = val
    }
}

func WithIntOption3(val int) Option {
    return func(opts *Options) {
        opts.IntOption3 = val
    }
}

func main() {
    InitOption3(
        WithStringOption1("str1"),
        WithStringOption3("str3"),
        WithIntOption3(3),
        WithIntOption2(2),
        WithIntOption1(1),
        WithStringOption2("str2"),
    )
}

执行：

init options3:&main.Options{StrOption1:"str1", StrOption2:"str2", StrOption3:"str3", IntOption1:1, IntOption2:2, IntOption3:3}