Defines a function that delegates to another module.

Functions defined with defdelegate/2 are public and can be invoked from outside the module they're defined in, as if they were defined using def/2. Therefore, defdelegate/2 is about extending the current module's public API. If what you want is to invoke a function defined in another module without using its full module name, then use alias/2 to shorten the module name or use import/2 to be able to invoke the function without the module name altogether.

Delegation only works with functions; delegating macros is not supported.

Check def/2 for rules on naming and default arguments.

Options

• :to - the module to dispatch to.

• :as - the function to call on the target given in :to. This parameter is optional and defaults to the name being delegated (funs).

Examples

defmodule MyList do
  defdelegate reverse(list), to: Enum
  defdelegate other_reverse(list), to: Enum, as: :reverse
end

MyList.reverse([1, 2, 3])
#=> [3, 2, 1]

MyList.other_reverse([1, 2, 3])
#=> [3, 2, 1]