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\name{bptry}
\alias{bptry}
\title{Try expression evaluation, recovering from bperror signals}
\description{
This function is meant to be used as a wrapper around
\code{bplapply()} and friends, returning the evaluated expression
rather than signalling an error.
}
\usage{
bptry(expr, ..., bplist_error, bperror)
}
\arguments{
\item{expr}{An R expression; see \code{\link{tryCatch}}.}
\item{bplist_error}{
A \sQuote{handler} function of a single argument, used to catch
\code{bplist_error} conditions signalled by \code{expr}. A
\code{bplist_error} condition is signalled when an element of
\code{bplapply} and other iterations contain a evaluation that
failed. When missing, the default retrieves the \dQuote{result}
attribute from the error, containing the partially evaluated
results.
Setting \code{bplist_error=identity} returns the evaluated
condition.
Setting \code{bplist_error=stop} passes the condition to other
handlers, notably the handler provided by \code{bperror}.
}
\item{bperror}{
A \sQuote{handler} function of a single argument, use to catch
\code{bperror} conditions signalled by \code{expr}. A \code{bperror}
is a base class to all errors signaled by \pkg{BiocParallel}
code. When missing, the default returns the condition without
signalling an error.
}
\item{\dots}{
Additional named handlers passed to \code{tryCatch()}. These
user-provided handlers are evaluated before default handlers
\code{bplist_error}, \code{bperror}.
}
}
\value{
The partially evaluated list of results.
}
\author{Martin Morgan \email{martin.morgan@roswellpark.org}}
\seealso{
\code{\link{bpok}}, \code{\link{tryCatch}}, \code{\link{bplapply}}.
}
\examples{
param = registered()[[1]]
param
X = list(1, "2", 3)
bptry(bplapply(X, sqrt)) # bplist_error handler
result <- bptry(bplapply(X, sqrt), bplist_error=identity) # bperror handler
result
bpresult(result)
}
\keyword{manip}
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