Handling exceptions in noexcept functions

How can I handle exceptions within a noexcept function without terminating the program?

If a noexcept function needs to handle exceptions internally without propagating them to the caller, you can use a try-catch block within the function:

#include <iostream>
#include <stdexcept>

void doSomething() noexcept {
  try {
    // Code that may throw an exception
    throw std::runtime_error(
      "Something went wrong");
  } catch (const std::exception& e) {
    // Handle the exception internally
    std::cerr << "Caught exception: " << e.what()
              << '\n';
    
    // Perform necessary cleanup or error handling
  }
}

int main() {
  doSomething();
  std::cout << "Program continues without "
    "termination";
}
Caught exception: Something went wrong
Program continues without termination

By catching and handling the exception within the noexcept function, you prevent it from propagating to the caller and causing the program to terminate. However, it's important to ensure that the exception is properly handled and the function can still meet its postconditions and invariants.

Using std::terminate() and the noexcept Specifier

This lesson explores the std::terminate() function and noexcept specifier, with particular focus on their interactions with move semantics.

Questions & Answers

Answers are generated by AI models and may not have been reviewed. Be mindful when running any code on your device.

Difference between std::terminate and std::abort
What is the difference between std::terminate() and std::abort() in C++?
Implementing a noexcept move assignment operator
How can I implement a noexcept move assignment operator for a custom type?
Logging with a custom terminate handler
How can I use a custom terminate handler to log information about an unhandled exception?
Using noexcept with move-only types
Why is noexcept important when working with move-only types?
noexcept and exception guarantees
How does the noexcept specifier relate to exception safety guarantees in C++?
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