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