39 lines
1.4 KiB
Go
39 lines
1.4 KiB
Go
|
// +build go1.13
|
||
|
|
|
||
|
|
package errors
|
||
|
|
|
||
|
|
import (
|
||
|
|
stderrors "errors"
|
||
|
|
)
|
||
|
|
|
||
|
|
// Is reports whether any error in err's chain matches target.
|
||
|
|
//
|
||
|
|
// The chain consists of err itself followed by the sequence of errors obtained by
|
||
|
|
// repeatedly calling Unwrap.
|
||
|
|
//
|
||
|
|
// An error is considered to match a target if it is equal to that target or if
|
||
|
|
// it implements a method Is(error) bool such that Is(target) returns true.
|
||
|
|
func Is(err, target error) bool { return stderrors.Is(err, target) }
|
||
|
|
|
||
|
|
// As finds the first error in err's chain that matches target, and if so, sets
|
||
|
|
// target to that error value and returns true.
|
||
|
|
//
|
||
|
|
// The chain consists of err itself followed by the sequence of errors obtained by
|
||
|
|
// repeatedly calling Unwrap.
|
||
|
|
//
|
||
|
|
// An error matches target if the error's concrete value is assignable to the value
|
||
|
|
// pointed to by target, or if the error has a method As(interface{}) bool such that
|
||
|
|
// As(target) returns true. In the latter case, the As method is responsible for
|
||
|
|
// setting target.
|
||
|
|
//
|
||
|
|
// As will panic if target is not a non-nil pointer to either a type that implements
|
||
|
|
// error, or to any interface type. As returns false if err is nil.
|
||
|
|
func As(err error, target interface{}) bool { return stderrors.As(err, target) }
|
||
|
|
|
||
|
|
// Unwrap returns the result of calling the Unwrap method on err, if err's
|
||
|
|
// type contains an Unwrap method returning error.
|
||
|
|
// Otherwise, Unwrap returns nil.
|
||
|
|
func Unwrap(err error) error {
|
||
|
|
return stderrors.Unwrap(err)
|
||
|
|
}
|