github.com/brownsys/tracing-framework-go@v0.0.0-20161210174012-0542a62412fe/go/darwin_amd64/misc/tour/content/methods/indirection-values.go (about)

     1  // +build OMIT
     2  
     3  package main
     4  
     5  import (
     6  	"fmt"
     7  	"math"
     8  )
     9  
    10  type Vertex struct {
    11  	X, Y float64
    12  }
    13  
    14  func (v Vertex) Abs() float64 {
    15  	return math.Sqrt(v.X*v.X + v.Y*v.Y)
    16  }
    17  
    18  func AbsFunc(v Vertex) float64 {
    19  	return math.Sqrt(v.X*v.X + v.Y*v.Y)
    20  }
    21  
    22  func main() {
    23  	v := Vertex{3, 4}
    24  	fmt.Println(v.Abs())
    25  	fmt.Println(AbsFunc(v))
    26  
    27  	p := &Vertex{4, 3}
    28  	fmt.Println(p.Abs())
    29  	fmt.Println(AbsFunc(*p))
    30  }