Nothing
# copied from vctrs, appropriately as described in ?vctrs::s3_register
s3_register <- function (generic, class, method = NULL) {
stopifnot(is.character(generic), length(generic) == 1)
stopifnot(is.character(class), length(class) == 1)
pieces <- strsplit(generic, "::")[[1]]
stopifnot(length(pieces) == 2)
package <- pieces[[1]]
generic <- pieces[[2]]
caller <- parent.frame()
get_method_env <- function() {
top <- topenv(caller)
if (isNamespace(top)) {
asNamespace(environmentName(top))
}
else {
caller
}
}
get_method <- function(method) {
if (is.null(method)) {
get(paste0(generic, ".", class), envir = get_method_env())
}
else {
method
}
}
register <- function(...) {
envir <- asNamespace(package)
method_fn <- get_method(method)
stopifnot(is.function(method_fn))
if (exists(generic, envir)) {
registerS3method(generic, class, method_fn, envir = envir)
}
# # commented because .rlang_s3_register_compat is not available, and
# # this is just used to warn
# else if (identical(Sys.getenv("NOT_CRAN"), "true")) {
# warn <- .rlang_s3_register_compat("warn")
# warn(c(sprintf("Can't find generic `%s` in package %s to register S3 method.",
# generic, package), i = "This message is only shown to developers using devtools.",
# i = sprintf("Do you need to update %s to the latest version?",
# package)))
# }
}
setHook(packageEvent(package, "onLoad"), function(...) {
register()
})
is_sealed <- function(pkg) {
identical(pkg, "base") || environmentIsLocked(asNamespace(pkg))
}
if (isNamespaceLoaded(package) && is_sealed(package)) {
register()
}
invisible()
}
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