直奔主题，看一下go中的接口是啥样子
package main
import "fmt"
type Point struct {
X, Y float64
}
type IInstance interface {
Instance() float64
}
type Path []Point
func (p Path) Instance() float64 {
return 123
}
func main() {
var i IInstance
p := Path{{1,2,},{3,4}}
i = p
fmt.Println(i.Instance())
}
package main
import (
"math"
"fmt"
)
type Point struct {
X,Y float64
}
func (p *Point) Distance2Point(q Point) float64 {
return math.Hypot(q.X-p.X, q.Y-p.Y)
}
func (p *Point) Distance() float64 {
return math.Hypot(p.X, p.Y)
}
type IDistance interface {
Distance() float64
}
type Path []*Point
func (p Path) Distance() float64 {
var sum float64
for i := 0; i < len(p)-1; i++ {
sum += p[i].Distance2Point(*p[i+1])
}
return sum
}
func print(p IDistance) {
fmt.Println(p.Distance())
}
func main() {
var path Path
path = make([]*Point, 3)
p1 := &Point{X:1, Y:2}
p2 := &Point{X:3, Y:4}
p3 := &Point{X:5, Y:6}
path[0] = p1
path[1] = p2
path[2] = p3
var i IDistance
i = p1
fmt.Println(i.Distance())
i = p2
fmt.Println(i.Distance())
i = path
fmt.Println(i.Distance())
print(path)
print(p1)
}
