What are some examples of RAII in C++?

What are some examples of RAII in C++?

RAII stands for Resource Acquisition Is Initialization. It ensures that resources are properly released when they go out of scope. A common example is using smart pointers like std::unique_ptr and std::shared_ptr.

Can you show me a code example using std::unique_ptr?

Sure! Here's a simple example:

#include <iostream>
#include <memory>

void useResource() {
    std::unique_ptr<int> ptr(new int(10)); // Resource acquired
    std::cout << *ptr << std::endl; // Use the resource
} // Resource automatically released here

What happens if I forget to use smart pointers?

If you forget to use smart pointers, you may end up with memory leaks, as the dynamically allocated memory won't be freed when it goes out of scope.

Are there other RAII examples besides smart pointers?

Yes, other examples include file handles, mutexes, and database connections, where the resource is tied to the object's lifetime.