How do std::unique_ptr and exceptions work together in C++?

Can you explain how std::unique_ptr works with exceptions in C++?

Sure! std::unique_ptr is a smart pointer that manages the lifetime of a dynamically allocated object. When an exception is thrown, the unique_ptr automatically deletes the associated object, preventing memory leaks.

What happens if I throw an exception while a unique_ptr is managing an object?

If an exception is thrown, the unique_ptr will ensure that the object it manages is properly deleted when it goes out of scope, thus handling resource management safely.

Can you give an example of this in code?

Certainly! Here's a simple example:

#include <iostream>
#include <memory>

void riskyFunction() {
    throw std::runtime_error("An error occurred!");
}

int main() {
    std::unique_ptr<int> ptr = std::make_unique<int>(42);
    try {
        riskyFunction();
    } catch (const std::exception& e) {
        std::cout << e.what() << std::endl;
    }
    // ptr is automatically deleted here
}