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A program is ill-formed if it instantiates an unexpected with a non-object type, an array type, a specialization of std::unexpected, or a cv. · synopsis // mostly freestanding namespace std { // class template unexpected template class unexpected; In addition, t must not be std::in_place_t or std::unexpect_t. // specialization for void template class bad_expected_access ; A program is ill-formed if it instantiates an expected with a reference type, a function type, or a specialization of std::unexpected. 3) throws any exception thrown by the initialization of the expected or unexpected value. In particular, std::expected has constructors with std::unexpected as a single argument, which creates an expected object that contains an unexpected value. 2) throws any exception thrown by the initialization of the expected or unexpected value. If it contains an unexpected value, it is nested within the expected object. // class template bad_expected_access template class bad_expected_access; // in-place construction of unexpected values struct unexpect_t 2) a constant of type const std::unexpect_t which is usually directly passed to a constructor of std::expected to construct an unexpected value. · exceptions primary template constructors 1) throws any exception thrown by the initialization of the expected value. · represents an expected void value or contains an unexpected value. · the class template std::unexpected represents an unexpected value stored in std::expected. · 1) a tag type for in-place construction of an unexpected value in an std::expected object.