optional Directory Reference

Files
	basic_optional_storage.h
	constructible_from_cref_optional.h
	get_value.h
	is_nullopt.h
	lift_bool.h
	make_optional.h
	nullopt.h
	optional.h
	optional_forward_declaration.h
	optional_storage.h
	optional_void.h
	prelude.h
	set_nullopt.h
	set_value.h
	storage_for.h