package errors
import "errors"
errors包实现了创建错误值的函数。
Example
package errors_test
import (
"fmt"
"time"
)
// MyError is an error implementation that includes a time and message.
type MyError struct {
When time.Time
What string
}
func (e MyError) Error() string {
return fmt.Sprintf("%v: %v", e.When, e.What)
}
func oops() error {
return MyError{
time.Date(1989, 3, 15, 22, 30, 0, 0, time.UTC),
"the file system has gone away",
}
}
func Example() {
if err := oops(); err != nil {
fmt.Println(err)
}
// Output: 1989-03-15 22:30:00 +0000 UTC: the file system has gone away
}
Index
Examples
func New
func New(text string) error
使用字符串创建一个错误,请类比fmt包的Errorf方法,差不多可以认为是New(fmt.Sprintf(...))。
Example
err := errors.New("emit macho dwarf: elf header corrupted")
if err != nil {
fmt.Print(err)
}
Output:
emit macho dwarf: elf header corrupted
Example (Errorf)
const name, id = "bimmler", 17
err := fmt.Errorf("user %q (id %d) not found", name, id)
if err != nil {
fmt.Print(err)
}
Output:
user "bimmler" (id 17) not found