Set for golang
package main
import (
"fmt"
"github.com/Wang-Kai/gset"
)
func main() {
set := gset.NewStrSet().Add("hostname1", "hostname1", "hostname2")
if !set.Has("hostname3") {
println("The hostname3 dose not exist")
}
fmt.Printf("There are %d host", set.Len())
}