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reflect.Uint() 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.Uint() Function in Golang is used to get v’s underlying value, as a uint64. To access this function, one needs to imports the reflect package in the program.

Syntax:

func (v Value) Uint() uint64

Parameters: This function does not accept any parameter.

Return Value: This function returns the v’s underlying value, as a uint64.

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



Example 1:




// Golang program to illustrate
// reflect.Uint() Function
     
package main
     
import (
    "fmt"
    "reflect"
)
    
func sum(args []reflect.Value) []reflect.Value {
    a, b := args[0], args[1]
    if a.Kind() != b.Kind() {
        fmt.Println("??? ????.")
        return nil
    }
    
    switch a.Kind() {
    case reflect.Int, reflect.Int8, reflect.Int16,
                     reflect.Int32, reflect.Int64:
        return []reflect.Value{reflect.ValueOf(a.Int() + b.Int())}
  
    case reflect.Uint, reflect.Uint8, reflect.Uint16,
                      reflect.Uint32, reflect.Uint64:
        return []reflect.Value{reflect.ValueOf(a.Uint() + b.Uint())}
  
    case reflect.Float32, reflect.Float64:
        return []reflect.Value{reflect.ValueOf(a.Float() + b.Float())}
  
    case reflect.String:
        return []reflect.Value{reflect.ValueOf(a.String() + b.String())}
    default:
        return []reflect.Value{}
    }
}
    
func makeSum(fptr interface{}) {
    fn := reflect.ValueOf(fptr).Elem()
    
    v := reflect.MakeFunc(fn.Type(), sum)
    
    fn.Set(v)
}
     
// Main function
func main() {
    
    var intSum func(int, int) int64
    var floatSum func(float32, float32) float64
    var stringSum func(string, string) string
    
    makeSum(&intSum)
    makeSum(&floatSum)
    makeSum(&stringSum)
    
    fmt.Println(intSum(1, 2))
    fmt.Println(floatSum(2.1, 3.5))
    fmt.Println(stringSum("Geeksfor","Geeks"))
    
}

Output:

3
5.599999904632568
GeeksforGeeks

Example 2:




// Golang program to illustrate
// reflect.Uint() Function
     
package main
     
import (
    "fmt"
    "reflect"
)
    
func sum(args []reflect.Value) []reflect.Value {
    a, b := args[0], args[1]
    if a.Kind() != b.Kind() {
        fmt.Println("??? ????.")
        return nil
    }
    
    switch a.Kind() {
    case reflect.Int, reflect.Int8, reflect.Int16,
                     reflect.Int32, reflect.Int64:
        return []reflect.Value{reflect.ValueOf(a.Int() + b.Int())}
  
    case reflect.Uint, reflect.Uint8, reflect.Uint16,
                      reflect.Uint32, reflect.Uint64:
        return []reflect.Value{reflect.ValueOf(a.Uint() + b.Uint())}
  
    case reflect.Float32, reflect.Float64:
        return []reflect.Value{reflect.ValueOf(a.Float() + b.Float())}
  
    case reflect.String:
        return []reflect.Value{reflect.ValueOf(a.String() + b.String())}
    default:
        return []reflect.Value{}
    }
}
    
func makeSum(fptr interface{}) {
    fn := reflect.ValueOf(fptr).Elem()
    
    v := reflect.MakeFunc(fn.Type(), sum)
    
    fn.Set(v)
}
     
// Main function
func main() {
   
    var stringSum func(string, string) string
   
    makeSum(&stringSum)
    
    fmt.Println(stringSum("Value_1 : ","Geeks_1"))
    
}

Output:

Value_1 : Geeks_1



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