· 1) detects if the current thread has a live exception object, that is, an exception has been thrown or rethrown and not yet entered a matching catch clause, std::terminate or … Otherwise, returns a std::expected object that … · std::unexpected() is called by the c++ runtime when a dynamic exception specification is violated: · 1) a tag type for in-place construction of an unexpected value in an std::expected object. In particular, std::expected has constructors with std::unexpected as a single … · if *this contains an unexpected value, invokes f with the unexpected value of this as the argument and returns its result. If has_value() returns true, operator() can be used to access the expected value; A program is ill-formed if it … 2) throws any exception thrown by the initialization of the … · synopsis // mostly freestanding namespace std { // class template unexpected template class unexpected; // class template bad_expected_access template<class … · the class template std::unexpected represents an unexpected value stored in std::expected. 2) a constant of type const std::unexpect_t which is usually directly passed to a … · represents an expected void value or contains an unexpected value. · return value has_val notes a std::expected object is never valueless. An exception is thrown from a function whose exception specification … · return value the previously-installed unexpected handler, or a null pointer value if none was installed. If it contains an unexpected value, it is nested within the expected object. · exceptions primary template constructors 1) throws any exception thrown by the initialization of the expected value.
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· 1) detects if the current thread has a live exception object, that is, an exception has been thrown or rethrown and not yet entered...
