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% File src/library/base/man/taskCallback.Rd
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% File src/library/base/man/taskCallback.Rd
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% Part of the R package, https://www.R-project.org
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% Part of the R package, https://www.R-project.org
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% Copyright 1995-2015 R Core Team
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% Copyright 1995-2016 R Core Team
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% Distributed under GPL 2 or later
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% Distributed under GPL 2 or later
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\name{taskCallback}
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\name{taskCallback}
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\alias{addTaskCallback}
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\alias{addTaskCallback}
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\alias{removeTaskCallback}
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\alias{removeTaskCallback}
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  to allow C routines rather than R functions be used.
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  to allow C routines rather than R functions be used.
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}
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}
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\seealso{
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\seealso{
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  \code{\link{getTaskCallbackNames}}
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  \code{\link{getTaskCallbackNames}}
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  \code{\link{taskCallbackManager}}
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  \code{\link{taskCallbackManager}}
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  \url{http://developer.r-project.org/TaskHandlers.pdf}
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  \url{https://developer.r-project.org/TaskHandlers.pdf}
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}
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}
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\examples{
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\examples{
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times <- function(total = 3, str = "Task a") {
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times <- function(total = 3, str = "Task a") {
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  ctr <- 0
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  ctr <- 0
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  function(expr, value, ok, visible) {
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  function(expr, value, ok, visible) {