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                            Golang 接口技巧 ：

讓編譯器檢查，以確保某個類型實現接口。 

~~~
var _ fmt.Stringer = (*Data)(nil)
~~~
~~~
package main

import "fmt"

type Data struct {
	id   int
	name string
}

func (self *Data) String() string {
	return fmt.Sprintf("%d, %s", self.id, self.name)
}
func main() {
	var _ fmt.Stringer = (*Data)(nil)
}
~~~
某些時候，讓函數直接 "實現" 接口能省不少事。
 
~~~
package main

type Tester interface {
	Do()
}

type FuncDo func()

func (self FuncDo) Do() { self() }

func main() {
	var t Tester = FuncDo(func() { println("Hello, World!") })
	t.Do()
}
~~~

輸出結果：
~~~
Hello, World!
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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