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# ---
# repo: r-lib/withr
# file: standalone-defer.R
# last-updated: 2024-01-15
# license: https://unlicense.org
# ---
#
# `defer()` is similar to `on.exit()` but with a better default for
# `add` (hardcoded to `TRUE`) and `after` (`FALSE` by default).
# It also supports adding handlers to other frames which is useful
# to implement `local_` functions.
#
#
# ## Changelog
#
# 2024-01-15:
# * Rewritten to be pure base R.
#
# nocov start
defer <- function(expr, envir = parent.frame(), after = FALSE) {
thunk <- as.call(list(function() expr))
do.call(
on.exit,
list(thunk, add = TRUE, after = after),
envir = envir
)
}
# nocov end
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