Go語言中使用反射的方法

2020-04-01 19:21:33

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這篇文章主要介紹了Go語言中使用反射的方法,實例分析了Go語言實現反射的技巧,具有一定參考借鑒價值,需要的朋友可以參考下

本文實例講述了Go語言中使用反射的方法。分享給大家供大家參考。具體實現方法如下：

復制代碼代碼如下:

		// Data Model
		type Dish struct {
		  Id  int
		  Name string
		  Origin string
		  Query func()
		}

創建實例如下：

復制代碼代碼如下:

		shabushabu = Dish.new
		shabushabu.instance_variables # => []
		shabushabu.name = "Shabu-Shabu"
		shabushabu.instance_variables # => ["@name"]
		shabushabu.origin = "Japan"
		shabushabu.instance_variables # => ["@name", "@origin"]

完整代碼如下：

復制代碼代碼如下:

		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
		}