Golang 反射

反射

反射三法则

从接口值到反射对象

package mainimport (    "fmt"    "reflect")func main() {    var x float64 = 3.4    v := reflect.ValueOf(x)    fmt.Println("type:", v.Type())    fmt.Println("kind is float64:", v.Kind() == reflect.Float64)    fmt.Println("value:", v.Float())}

从反射对象到接口值

package mainimport (    "fmt"    "reflect")func main() {    var x float64 = 3.4    v := reflect.ValueOf(x)    fmt.Println(v.Interface())}

只能修改值是settable的反射对象的值

package mainimport (    "fmt"    "reflect")func main() {    var x float64 = 3.4    p := reflect.ValueOf(&x) // Note: take the address of x.    fmt.Println("type of p:", p.Type())    fmt.Println("settability of p:", p.CanSet())    v :=p.Elem()//Elem 返回指针p指向的值    fmt.Println("settability of v:", v.CanSet())    v.SetFloat(7.1)    fmt.Println(v.Interface())    fmt.Println(x)//now original x is changed}

接口

nil

参考

官方指导
reflect包
说话的白菜
博客