A future with a constant value
A constant future is a future whose expression is a constant and therefore by definition already resolved upon creation.
ConstantFuture( expr = NULL, envir = emptyenv(), substitute = FALSE, globals = NULL, packages = NULL, local = FALSE, ... )
An R expression.
The environment from where global objects should be identified.
If TRUE, argument
substitute():ed, otherwise not.
(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.
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.
An object of class