undo

Documentation

Index

• func Do(fn func(u Undoer) error) error
• type Undoer

Examples

• Do

Functions

func Do

func Do(fn func(u Undoer) error) error

Do runs a func with a new Undoer. If the func returns error, all the undo funcs, registered with the Undoer will run in reverse order and all errors will be joined with the main error.

Example

fmt.Println(Do(func(u Undoer) error {
	u.Undo(func() error {
		fmt.Println("undoing")
		return errors.New("undo error")
	})
	fmt.Println("doing")
	return errors.New("do error")
}))

Output:

doing
undoing
do error
undo error

Types

type Undoer

type Undoer interface {
	// Undo registers an undo function.
	Undo(fn func() error)
}

Undoer allows registring undo functions.