How to use reflect.Type.Implements

[David DENG]

The problem is how to generate a reflect.Type of an interface type? if this is not possible, in which case this method could be used?

Thanks!

[Jan Mercl]

On Thu, Mar 19, 2015 at 5:40 AM David DENG <david...@gmail.com> wrote:

> The problem is how to generate a reflect.Type of an interface type? if this
> is not possible, in which case this method could be used?

For example (http://play.golang.org/p/V7XTlxTC8Q):

package main

import (

"bufio"

"fmt"

"io"

"os"

"reflect"

)

var (

iface        interface{}

ioReader     io.Reader

ioRuneReader io.RuneReader

)

func main() {

bufioReader := bufio.NewReader(nil)

osFile := &os.File{}

iface = bufioReader

t := reflect.TypeOf(iface)

fmt.Println(t.Implements(reflect.TypeOf(&ioReader).Elem()))

fmt.Println(t.Implements(reflect.TypeOf(&ioRuneReader).Elem()))

iface = osFile

t = reflect.TypeOf(iface)

fmt.Println(t.Implements(reflect.TypeOf(&ioReader).Elem()))

fmt.Println(t.Implements(reflect.TypeOf(&ioRuneReader).Elem()))

}

Output.

true

true

true

false

-j

[Jesse McNelis]

On 19 Mar 2015 15:40, "David DENG" <david...@gmail.com> wrote:
>
> The problem is how to generate a reflect.Type of an interface type? if this is not possible, in which case this method could be used?
>

Get the reflect.Type of a pointer to that interface and then called the .Elem() method to get a reflect.Type of the interface.

[David DENG]

Thanks guys, the pointer-Elem trick works!