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reflect.CanAddr() Function in Golang with Examples
  • Last Updated : 03 May, 2020

Go language provides inbuilt support implementation of run-time reflection and allowing a program to manipulate objects with arbitrary types with the help of reflect package. The reflect.CanAddr() Function in Golang is used to check whether the value’s address can be obtained with Addr. To access this function, one needs to imports the reflect package in the program.

Syntax:

func (v Value) CanAddr() bool

Parameters: This function does not accept any parameters.

Return Value: This function returns the boolean value.

Below examples illustrate the use of the above method in Golang:



Example 1:




// Golang program to illustrate
// reflect.CanAddr() Function
    
package main
    
import (
    "fmt"
    "reflect"
)
    
// Main function 
func main() {
       
    typ := reflect.StructOf([]reflect.StructField{
        {
            Name: "Height",
            Type: reflect.TypeOf(float64(0)),
            Tag:  `json:"height"`,
        },
        {
            Name: "Age",
            Type: reflect.TypeOf(int(0)),
            Tag:  `json:"age"`,
        },
    })
   
    v := reflect.New(typ).Elem()
    v.Field(0).SetFloat(0.4)
    v.Field(1).SetInt(2)
    s := v.CanAddr()
    fmt.Printf("value: %+v\n", s)
}         

Output:

value: true

Example 2:




// Golang program to illustrate
// reflect.CanAddr() Function
    
package main
    
import (
    "fmt"
    "reflect"
)
    
// Main function 
type superint struct {
    A int
    B int
}
   
func (s *superint) lol() {}
   
type a interface{ lol() }
   
func main() {
    i := superint{A: 1, B: 9}
    valPtr := reflect.ValueOf(&i)
    fmt.Printf("%v \n", i)
   
    // use of Addr() method
    fmt.Printf("%v \n", valPtr.Elem().CanAddr())
}

Output:

{1 9} 
true 

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