A future represents a value that will be available at some point in the future
A future is an abstraction for a value that may
available at some point in the future. A future can either be
resolved, a state which can be checked
resolved(). As long as it is unresolved, the
value is not available. As soon as it is resolved, the value
is available via
Future(expr = NULL, envir = parent.frame(), substitute = FALSE, stdout = TRUE, globals = NULL, packages = NULL, seed = NULL, lazy = FALSE, local = TRUE, gc = FALSE, earlySignal = FALSE, label = NULL, ...)
An R expression.
The environment from where global objects should be identified.
If TRUE, argument
substitute():ed, otherwise not.
If TRUE (default), then the standard output is captured, and re-outputted when
value()is called. If FALSE, any output is silenced (by sinking it to the null device as it is outputted). If NA (not recommended), output is not intercepted.
(optional) a logical, a character vector, or a named list to control how globals are handled. For details, see section 'Globals used by future expressions' in the help for
(optional) a character vector specifying packages to be attached in the R environment evaluating the future.
(optional) A L'Ecuyer-CMRG RNG seed.
FALSE(default), the future is resolved eagerly (starting immediately), otherwise not.
If TRUE, the expression is evaluated such that all assignments are done to local temporary environment, otherwise the assignments are done to the global environment of the R process evaluating the future.
If TRUE, the garbage collector run (in the process that evaluated the future) after the value of the future is collected. Some types of futures ignore this argument.
Specified whether conditions should be signaled as soon as possible or not.
An optional character string label attached to the future.
Additional named elements of the future.
A Future object is itself an environment.
An object of class
One function that creates a Future is
It returns a Future that evaluates an R expression in the future.
An alternative approach is to use the
assignment operator, which creates a future from the
right-hand-side (RHS) R expression and assigns its future value
to a variable as a promise.