mlr3misc (version 0.3.0)

require_namespaces: Require Multiple Namespaces

Description

Packages are loaded (not attached) via base::requireNamespace(). If at least on package can not be loaded, an exception of class "packageNotFoundError" is raised. The character vector of missing packages is stored in the condition as packages.

Usage

require_namespaces(
  pkgs,
  msg = "The following packages could not be loaded: %s"
)

Arguments

pkgs

(character()) Packages to load.

msg

(character(1)) Message to print on error. Use "%s" as placeholder for the list of packages.

Value

(named character()) of loaded packages (invisibly).

Examples

# NOT RUN {
require_namespaces("mlr3misc")

# catch condition, return missing packages
tryCatch(require_namespaces(c("mlr3misc", "foobaaar")),
  packageNotFoundError = function(e) e$packages)
# }