Defined in header <exception> | ||
---|---|---|
void unexpected(); | (until C++11) | |
[[noreturn]] void unexpected(); | (since C++11) (deprecated) (removed in C++17) |
std::unexpected()
is called by the C++ runtime when a dynamic exception specification is violated: an exception is thrown from a function whose exception specification forbids exceptions of this type.
std::unexpected()
may also be called directly from the program.
In either case, std::unexpected
calls the currently installed std::unexpected_handler
. The default std::unexpected_handler
calls std::terminate
.
If a destructor reset the unexpected handler during stack unwinding and the unwinding later led to | (until C++11) |
If a destructor reset the unexpected handler during stack unwinding, it is unspecified which handler is called if the unwinding later led to | (since C++11) |
(none).
(none).
Throw any exception thrown by the currently installed std::unexpected_handler
.
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
DR | Applied to | Behavior as published | Correct behavior |
---|---|---|---|
LWG 2111 | C++11 | effect of calling set_unexpected during stack unwinding differs from C++98 and breaks some ABIs | made unspecified |
(removed in C++17) | the type of the function called by std::unexpected (typedef) |
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