error接口
02 Oct 2017实现error接口的结构体
结构体 MyError 实现了 Error 方法，fmt.Println 会判断它实现了error 接口, 调用它的Error 方法
实现
package main
import (
"fmt"
"time"
)
type MyError struct {
When time.Time
What string
}
func (e *MyError) Error() string {
return fmt.Sprintf("at %v, %s",
e.When, e.What)
}
func run() error {
return &MyError{
time.Now(),
"it didn't work",
}
}
func main() {
if err := run(); err != nil {
fmt.Println(err)
}
}
运行结果
at 2017-10-02 18:44:42.527726 +0800 CST, it didn't work