If a noexcept function throws an exception, whether directly or by rethrowing, it results in a call to std::terminate(), which by default, calls abort() and terminates the program.
#include <exception>
#include <iostream>
#include <stdexcept>
void rethrowException() noexcept {
try {
throw std::runtime_error(
"Original exception");
} catch (...) {
std::rethrow_exception(
std::current_exception());
}
}
int main() {
try {
rethrowException();
} catch (const std::exception& e) {
std::cout << "Caught exception: "
<< e.what() << "\n";
}
}Error: abort() has been calledIn this example, rethrowException() is marked noexcept, but it rethrows an exception. This will call std::terminate() and abort the program. The catch block in main() will never be reached.
It's important to ensure that noexcept functions do not throw exceptions, including through rethrowing. If a noexcept function needs to handle an exception, it should catch and handle it fully within the function without rethrowing.
Alternatively, if a function needs to rethrow exceptions, it should not be marked noexcept:
#include <exception>
#include <iostream>
#include <stdexcept>
void rethrowException() { // not noexcept
try {
throw std::runtime_error(
"Original exception");
} catch (...) {
std::rethrow_exception(
std::current_exception());
}
}
int main() {
try {
rethrowException();
} catch (const std::exception& e) {
std::cout << "Caught exception: "
<< e.what() << "\n";
}
}Caught exception: Original exceptionNow the exception is rethrown and caught in main() as expected.
Answers to questions are automatically generated and may not have been reviewed.
Storing and Rethrowing Exceptions
This lesson offers a comprehensive guide to storing and rethrowing exceptions
