Models OTP behaviours and the children they start.
Recognised by use GenServer, use Agent, use Task, use Supervisor,
use DynamicSupervisor, use Application, or use GenStateMachine
(and the @behaviour equivalents). Children are read from any list bound
to a variable named children, or passed directly to
Supervisor.start_link/2 or Supervisor.init/2; each child spec is
reduced to its module (Mod, {Mod, arg}, %{start: {Mod, _, _}},
Mod.child_spec(...)).
Summary
Functions
Whether the process starts child.
Whether the process is one that must be started by something else.