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reflect.Cap() Function in Golang with Examples

  • Last Updated : 20 Apr, 2021

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 integer value. 
 

Below examples illustrate the use of the above method in Golang:
Example 1:
 

C






// 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:
 

C




// 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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