require_namespaces {mlr3misc}

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)