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Oct 30, 2024 · The class template std::unexpected represents an unexpected value stored in std::expected. In particular, std::expected has constructors with std::unexpected as a single. Aug 20, 2024 · The default std::unexpected_handler calls std::terminate. If a destructor reset the unexpected handler during stack unwinding and the unwinding later led to unexpected being called,. Mar 27, 2025 · Represents an expected void value or contains an unexpected value. If it contains an unexpected value, it is nested within the expected object. A program is ill-formed if it instantiates an. Nov 27, 2023 · Synopsis // mostly freestandingnamespace std {// class template unexpectedtemplate<class E >class unexpected; // class template. Nov 3, 2024 · 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.

2) Compares std::expected object with an std::unexpected object. The objects compare equal if and only if lhs contains an unexpected value that is equal to unex.error(). If the expression lhs.error()==.