promise

package

v1.52.0 Latest Latest Go to latest Published: Sep 18, 2026 License: Apache-2.0 Imports: 2 Imported by: 0

Details

Package promise carries no dependencies beyond the standard library, so a package that needs only a promise does not inherit the rest of utils.

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func Await[T any](ctx context.Context, p *Promise[T]) (T, error)

type Promise[T any] struct {
	Result T
	Err    error
	// contains filtered or unexported fields
}

func Go[T any](f func() (T, error)) *Promise[T]

func New[T any]() *Promise[T]

func NewResolved[T any](result T, err error) *Promise[T]

NewResolved is spelled apart from the Resolved method, which reports whether a promise has settled.

func (p *Promise[T]) Done() <-chan struct{}

func (p *Promise[T]) Resolve(result T, err error)

func (p *Promise[T]) Resolved() bool

func (p *Promise[T]) Then(f func(T, error))

Then registers f to run when p resolves, on the goroutine that calls Resolve. If p is already resolved, f runs inline on the calling goroutine.