require_namespaces: Require Multiple Namespaces

In mlr3misc: Helper Functions for 'mlr3'

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",
  quietly = FALSE
)

Arguments

pkgs	(character()) Packages to load.
msg	(character(1)) Message to print on error. Use "%s" as placeholder for the list of packages.
quietly	(logical(1)) If TRUE then returns TRUE if all packages are loaded, otherwise FALSE.

Value

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

Examples

require_namespaces("mlr3misc")

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

mlr3misc documentation built on Sept. 20, 2023, 5:06 p.m.