reflect.TrySend() Function in Golang with Examples

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.TrySend() Function in Golang attempts to send x on the channel v but will not block. To access this function, one needs to imports the reflect package in the program.

Syntax:

func (v Value) TrySend(x Value) bool

Parameters: This function accept one parameter of Value type (x).

Return Value: This function returns whether the value was sent.

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

Example 1:

// Golang program to illustrate
// reflect.TrySend() Function

package main

 import (
    "fmt"
    "reflect"
 )

func main() {
    c := make(chan int, 1)
    vc := reflect.ValueOf(c)

    // use of TrySend() method
    succeeded := vc.TrySend(reflect.ValueOf(123))

    fmt.Println(succeeded, vc.Len(), vc.Cap())

}

Output:

true 1 1

Example 2:

// Golang program to illustrate
// reflect.TrySend() Function

 package main

 import (
    "fmt"
    "reflect"
 )

func main() {
    c := make(chan int, 1)
    vc := reflect.ValueOf(c)

     // use of TrySend() method
    succeeded := vc.TrySend(reflect.ValueOf(123))
    fmt.Println(succeeded, vc.Len(), vc.Cap())

    vSend, vZero := reflect.ValueOf(789), reflect.Value{}
    branches := []reflect.SelectCase{
        {Dir: reflect.SelectDefault, Chan: vZero, Send: vZero},
        {Dir: reflect.SelectRecv, Chan: vc, Send: vZero},
        {Dir: reflect.SelectSend, Chan: vc, Send: vSend},
    }

    selIndex, vRecv, sentBeforeClosed := reflect.Select(branches)
    fmt.Println(selIndex)
    fmt.Println(sentBeforeClosed)
    fmt.Println(vRecv.Int())
    vc.Close()
    // Remove the send case branch this time,
    // for it may cause panic.
    selIndex, _, sentBeforeClosed = reflect.Select(branches[:2])
    fmt.Println(selIndex, sentBeforeClosed)
}

Output:

true 1 1
1
true
123
1 false