defergroup

type DeferGroup ¶

type DeferGroup struct {
	// contains filtered or unexported fields
}

Just like "defer", but can be canceled. Useful in constructor functions when there are multiple resources need to be acquired, but that can fail to be allocated itself.

Examples:

 dg := DeferGroup{}
	defer dg.Exec()

	resource, err := Allocate()
	if err != nil {
		return err
	}
	dg.Defer(func() { resource.Close() })

	// More allocations.

	dg.CancelExec() // Everything is OK, no cleanup required.
	return nil

func (m *DeferGroup) CancelExec()

func (m *DeferGroup) Defer(fn func())

func (m *DeferGroup) Exec()