What is std::exception rethrow in C++?

Can you explain what std::exception rethrow means in C++?

Sure! In C++, std::exception rethrow refers to the practice of throwing an exception again after catching it, allowing it to propagate up the call stack.

Why would I want to rethrow an exception instead of just handling it?

Rethrowing an exception is useful when you want to perform some cleanup or logging in the catch block but still want the exception to be handled by a higher-level handler.

Can you show me an example of how to rethrow an exception?

Certainly! Here's a simple example:

try {
    // code that may throw an exception
} catch (const std::exception& e) {
    // log the exception
    std::cerr << "Caught: " << e.what() << std::endl;
    throw; // rethrow the exception
}