Go语言中使用反射的范例代码片段
// Data Model
type Dish struct { Id int Name string Origin string Query func() }
创建实例
shabushabu = Dish.new shabushabu.instance_variables # => [] shabushabu.name = "Shabu-Shabu" shabushabu.instance_variables # => ["@name"] shabushabu.origin = "Japan" shabushabu.instance_variables # => ["@name", "@origin"]
完整代码
package main import( "fmt" "reflect" ) func main(){ // iterate through the attributes of a Data Model instance for name, mtype := range attributes(&Dish{}) { fmt.Printf("Name: %s, Type %s\n", name, mtype.Name()) } } // Data Model type Dish struct { Id int Name string Origin string Query func() } // Example of how to use Go's reflection // Print the attributes of a Data Model func attributes(m interface{}) (map[string]reflect.Type) { typ := reflect.TypeOf(m) // if a pointer to a struct is passed, get the type of the dereferenced object if typ.Kind() == reflect.Ptr{ typ = typ.Elem() } // create an attribute data structure as a map of types keyed by a string. attrs := make(map[string]reflect.Type) // Only structs are supported so return an empty result if the passed object // isn't a struct if typ.Kind() != reflect.Struct { fmt.Printf("%v type can't have attributes inspected\n", typ.Kind()) return attrs } // loop through the struct's fields and set the map for i := 0; i < typ.NumField(); i++ { p := typ.Field(i) if !p.Anonymous { attrs[p.Name] = p.Type } } return attrs }