R/dplyr-compat.R

In topepo/tidyposterior: Bayesian Analysis to Compare Models using Resampling Statistics

# nocov
## adapted from
## https://github.com/hadley/dtplyr/blob/2308ff25e88bb81fe84f9051e37ddd9d572189ee/R/compat-dplyr-0.6.0.R
## and based on
## https://github.com/tidyverse/googledrive/commit/95455812d2e0d6bdf92b5f6728e3265bf65d8467#diff-ba61d4f2ccd992868e27305a9ab68a3c

## function is called in .onLoad()
register_s3_method <- function(pkg, generic, class, fun = NULL) { # nocov start
  stopifnot(is_string(pkg))
  envir <- asNamespace(pkg)

  stopifnot(is_string(generic))
  stopifnot(is_string(class))
  if (is.null(fun)) {
    fun <- get(paste0(generic, ".", class), envir = parent.frame())
  }
  stopifnot(is.function(fun))

  if (pkg %in% loadedNamespaces()) {
    registerS3method(generic, class, fun, envir = envir)
  }

  # Always register hook in case package is later unloaded & reloaded
  setHook(
    packageEvent(pkg, "onLoad"),
    function(...) {
      registerS3method(generic, class, fun, envir = envir)
    }
  )
} # nocov end