Go语言抽象能力弱是语言特性限制的。
如下用工厂模式实现两种配置加载的逻辑。
获取配置方式一:
func GetConfig[T any]() T {switch any(*new(T)).(type) {case Config1:return any(Config1{}).(T)case Config2:return any(Config2{}).(T)default:return any(Config0{}).(T)}
}type Config0 struct{}type Config1 struct {Pkg string
}type Config2 struct{}
获取配置方式二:
type Cfg interface {Load()
}func GetConfig[T any]() (T, error) {cfg, ok := any(new(T)).(Cfg)if !ok {return *new(T), errors.New(fmt.Sprintf("%T type is not implement Cfg interface", *new(T)))}cfg.Load()return *any(cfg).(*T), nil
}type Config0 struct {Name string
}func (c *Config0) Load() {c.Name = "name"
}type Config1 struct {Pkg string
}func (c *Config1) Load() {c.Pkg = "pkg"
}type Config2 struct {Operator string
}func (c *Config2) Load() {c.Operator = "+"
}