std::unexpected_handler(3) C++ Standard Libary std::unexpected_handler(3) NAME std::unexpected_handler - std::unexpected_handler Synopsis Defined in header <exception> typedef void (*unexpected_handler)(); (deprecated in C++11) (removed in C++17) std::unexpected_handler is the function pointer type (pointer to func- tion that takes no arguments and returns void), which is installed and queried by the functions std::set_unexpected and std::get_unexpected and called by std::unex- pected. The C++ implementation provides a default std::unexpected_handler func- tion, which calls std::terminate(). If the null pointer value is installed (by means of std::set_unexpected), the implementation may restore the default handler instead. A user-defined std::unexpected_handler is expected to either terminate the program or throw an exception. If it throws an exception, one of the following three situations may be encountered: 1) the exception thrown by std::unexpected_handler satisfies the dynamic exception specification that was violated earlier. The new exception is allowed to escape the function and stack unwinding continues. 2) the exception thrown by std::unexpected_handler still violates the exception specification: 2a) however, the exception specification allows std::bad_exception: the thrown exception object is destroyed, and std::bad_exception is constructed by the C++ runtime and thrown instead. 2b) the exception specification does not allow std::bad_exception: std::terminate() is called. See also unexpected function called when dynamic exception speci- fication is (removed in C++17) violated (function) set_unexpected changes the function to be called by std::un- expected (removed in C++17) (function) get_unexpected obtains the current unexpected_handler (C++11)(removed in C++17) (function) http://cppreference.com 2024.06.10 std::unexpected_handler(3)
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