Golang flag.Getter type example

package flag

Getter is an interface that allows the contents of a Value to be retrieved. It wraps the Value interface, rather than being part of it, because it appeared after Go 1 and its compatibility rules. All Value types provided by this package satisfy the Getter interface.

Golang flag.Getter type usage example

 cfg := config.Config{
 Verbosity: (*flagset.Lookup("verbosity")).Value.(flag.Getter).Get().(int),
 EtcdServers: (*flagset.Lookup("etcd_servers")).Value.(flag.Getter).Get().(stringSlice),
 EtcdKeyPrefix: (*flagset.Lookup("etcd_key_prefix")).Value.(flag.Getter).Get().(string),
 EtcdKeyFile: (*flagset.Lookup("etcd_keyfile")).Value.(flag.Getter).Get().(string),
 EtcdCertFile: (*flagset.Lookup("etcd_certfile")).Value.(flag.Getter).Get().(string),
 }

Reference :

http://golang.org/pkg/flag/#Getter