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reflect.Cap() Function in Golang with Examples
  • Last Updated : 03 May, 2020
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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.Cap() Function in Golang is used to get the v’s capacity. To access this function, one needs to imports the reflect package in the program.

Syntax:

func (v Value) Cap() int

Parameters: This function does not accept any parameters.

Return Value: This function returns the interger value.

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



Example 1:




// Golang program to illustrate 
// reflect.Cap() Function 
  
package main
   
 import (
    "fmt"
    "reflect"
 )
   
func main() {
    c := make(chan int, 1)
    vc := reflect.ValueOf(c)
      
    succeeded := vc.TrySend(reflect.ValueOf(123))
      
    // use of Cap() method
    fmt.Println(succeeded, vc.Len(), vc.Cap())
   
}               

Output:

true 1 1

Example 2:




// Golang program to illustrate 
// reflect.Cap() Function 
  
package main 
  
import ( 
    "fmt"
    "reflect"
  
// Main function 
func main() { 
  
    var val chan string 
  
    var strVal reflect.Value = reflect.ValueOf(&val) 
  
    indirectStr := reflect.Indirect(strVal) 
   
    value := reflect.MakeChan(indirectStr.Type(), 1024) 
      
    // use of Cap() method
    fmt.Printf("Type : [%v] \nCapacity : [%v]", value.Kind(), value.Cap()) 

Output:

Type : [chan] 
Capacity : [1024]

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