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

     1  // +build OMIT
     2  
     3  package main
     4  
     5  import (
     6  	"fmt"
     7  	"math"
     8  )
     9  
    10  type I interface {
    11  	M()
    12  }
    13  
    14  type T struct {
    15  	S string
    16  }
    17  
    18  func (t *T) M() {
    19  	fmt.Println(t.S)
    20  }
    21  
    22  type F float64
    23  
    24  func (f F) M() {
    25  	fmt.Println(f)
    26  }
    27  
    28  func main() {
    29  	var i I
    30  
    31  	i = &T{"Hello"}
    32  	describe(i)
    33  	i.M()
    34  
    35  	i = F(math.Pi)
    36  	describe(i)
    37  	i.M()
    38  }
    39  
    40  func describe(i I) {
    41  	fmt.Printf("(%v, %T)\n", i, i)
    42  }