go修行10日目 embeded - Qiita

package main import "fmt" type Vertex struct{ x, y int } func (v Vertex) Area() int{ return v.x * v.y } func (v *Vertex) Scale(i int){ v.x = v.x * i v.y = v.y * i } type Vertex3D struct{ Vertex z int } func (v Vertex3D) Area3D() int{ return v.x * v.y * v.z } func (v *Vertex3D) Scale3D(i int){ v.x = v.x * i v.y = v.y * i v.z = v.z * i } func New(x, y, z int) *Vertex3D{ return &Vertex3D{Vertex{x, y}