async_reflect: Make an asynchronous function that always succeeds

In r-lib/async: Asynchronous Computation and 'I/O'

Make an asynchronous function that always succeeds

Description

This is sometimes useful, if the function is applied to entries in a vector or list.

Usage

async_reflect(task)

Arguments

task	Function to transform.

Value

Async function returning a deferred value that is never rejected. Instead its value is a list with entries error and result. If the original deferred was resolved, then error is NULL. If the original deferred was rejected, then result is NULL.

See Also

Other async control flow: async_backoff(), async_retry(), async_retryable(), async_sequence(), async_try_each(), async_until(), async_whilst()

Examples

 badfun <- async(function() stop("oh no!"))
 safefun <- async_reflect(badfun)
 synchronise(when_all(safefun(), "good"))

r-lib/async documentation built on Nov. 19, 2024, 12:08 p.m.