| postponeAction {pkgmaker} | R Documentation |
This function implement a mechanism to postpone actions,
which can be executed at a later stage. This is useful
when developing packages, where actions that need to be
run in the link{.onLoad} function but can be
defined close to their context.
postponeAction(expr, key = digest(tempfile()),
group = NULL, envir = topns(strict = FALSE),
verbose = getOption("verbose"))
runPostponedAction(group = NULL,
verbose = getOption("verbose"))
expr |
expression that define the action to postpone. Currently only functions are supported. |
key |
identifier for this specific action. It should be unique across the postponed actions from the same group. |
group |
optional parent action group. This enables to define meaningful sets of actions that can be run all at once. |
envir |
environment in which the action should be executed. Currently not used. |
verbose |
logical that toggles verbose messages. |
opt <- options(verbose=2)
# define actions
postponeAction(function(){print(10)}, "print")
postponeAction(function(){print(1:10)}, "more")
postponeAction()
# execute actions
runPostponedAction()
runPostponedAction()
# restore options
options(opt)