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]

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template<class Err = E> constexpr explicit unexpected(Err&& e);
1
#
Constraints:
  • (1.1)
    is_same_v<remove_cvref_t<Err>, unexpected> is false; and
  • (1.2)
    is_same_v<remove_cvref_t<Err>, in_place_t> is false; and
  • (1.3)
    is_constructible_v<E, Err> is true.
2
#
Effects: Direct-non-list-initializes unex with std​::​forward<Err>(e).
3
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Throws: Any exception thrown by the initialization of unex.
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template<class... Args> constexpr explicit unexpected(in_place_t, Args&&... args);
4
#
Constraints: is_constructible_v<E, Args...> is true.
5
#
Effects: Direct-non-list-initializes unex with std​::​forward<Args>(args)....
6
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Throws: Any exception thrown by the initialization of unex.
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template<class U, class... Args> constexpr explicit unexpected(in_place_t, initializer_list<U> il, Args&&... args);
7
#
Constraints: is_constructible_v<E, initializer_list<U>&, Args...> is true.
8
#
Effects: Direct-non-list-initializes unex with il, std​::​forward<Args>(args)....
9
#
Throws: Any exception thrown by the initialization of unex.