Go言語におけるエイリアス型を使ったパターン ref: http://qiita.com/tenntenn/items/c3afc87a20d9f50998bb

file0.txt

package main

import "fmt"

type Int int

func main() {
    n := 100
    m := Int(n) // キャスト
    fmt.Printf("%T, %T", n, m)
}

file1.txt

package main

import "fmt"

type Hex int

func (h Hex) String() string {
    return fmt.Sprintf("%#x", int(h))
}

func main() {
    fmt.Println(Hex(100))
}

file2.txt

package main

import "fmt"

type Meter int
type Kilogram int

type Person struct {
    Name   string
    Height Meter
    Weight Kilogram
}

type Female *Person
type Male *Person

func femaleOnly(f Female) {
    fmt.Println(f.Name, "is a female.")
}

func main() {
    yamada := &Person{"Yamada", Meter(172), Kilogram(60)}
    fmt.Println(yamada)

    femaleOnly(Female(yamada))

}