Use is.promise to determine whether an R object is a promise. Use
as.promise (an S3 generic method) to attempt to coerce an R object to a
promise. This package includes support for converting future::Future
objects into promises.
is.promise(x)
is.promising(x)
as.promise(x)An R object to test or coerce.
as.promise returns a promise object, or throws an error if the
object cannot be converted.
is.promise returns TRUE if the given value is a promise object, and
FALSE otherwise.
is.promising returns TRUE if the given value is a promise object or
if it can be converted to a promise object using as.promise, and FALSE
otherwise.