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reflect.UnsafeAddr() Function in Golang with Examples

  • Last Updated : 10 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.UnsafeAddr() Function in Golang is used to get the pointer to v’s data. To access this function, one needs to imports the reflect package in the program.

Syntax:

func (v Value) UnsafeAddr() uintptr

Parameters: This function does not accept any parameter.

Return Value: This function returns the pointer to v’s data.

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



Example 1:




// Golang program to illustrate 
// reflect.UnsafeAddr() Function 
    
package main 
    
import ( 
    "fmt"
    "reflect"
    "unsafe"
    
// Main function 
func main() {
        var s = struct{ foo int }{42}
    var i int
  
    rs := reflect.ValueOf(&s).Elem() 
    rf := rs.Field(0)                
    ri := reflect.ValueOf(&i).Elem() 
  
    rf = reflect.NewAt(rf.Type(), unsafe.Pointer(rf.UnsafeAddr())).Elem()
    ri.Set(rf)
    rf.Set(ri)
    fmt.Println(rf) 
    fmt.Println(ri) 
      
}

Output:

42
42

Example 2:




// Golang program to illustrate 
// reflect.UnsafeAddr() Function 
    
package main 
    
import ( 
    "fmt"
    "reflect"
    "unsafe"
    
// Main function 
func main() {
    var s = struct{ foo int }{374}
    var i int
  
    rs := reflect.ValueOf(s)
  
    rf := rs.Field(0)
      
    rs2 := reflect.New(rs.Type()).Elem()
    rs2.Set(rs)
    rf = rs2.Field(0)
    rf = reflect.NewAt(rf.Type(), unsafe.Pointer(rf.UnsafeAddr())).Elem()
      
    ri := reflect.ValueOf(&i).Elem() // i, but writeable
    ri.Set(rf)
      
    fmt.Println(rf) 
    fmt.Println(ri) 
      
}

Output:

374
374



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