[expected.un.cons] (original) (raw)

22 General utilities library [utilities]

22.8 Expected objects [expected]

22.8.3 Class template unexpected [expected.unexpected]

22.8.3.2 Constructors [expected.un.cons]

template<class Err = E> constexpr explicit unexpected(Err&& e);

Constraints:

• is_same_v<remove_cvref_t<Err>, unexpected> is false; and
• is_same_v<remove_cvref_t<Err>, in_place_t> is false; and
• is_constructible_v<E, Err> is true.

Effects: Direct-non-list-initializes unex with std​::​forward<Err>(e).

Throws: Any exception thrown by the initialization of unex.

template<class... Args> constexpr explicit unexpected(in_place_t, Args&&... args);

Constraints: is_constructible_v<E, Args...> is true.

Effects: Direct-non-list-initializes_unex_ with std​::​forward<Args>(args)....

Throws: Any exception thrown by the initialization of unex.

template<class U, class... Args> constexpr explicit unexpected(in_place_t, initializer_list<U> il, Args&&... args);

Constraints: is_constructible_v<E, initializer_list<U>&, Args...> is true.

Effects: Direct-non-list-initializes_unex_ with il, std​::​forward<Args>(args)....

Throws: Any exception thrown by the initialization of unex.