How do I use unique_ptr in C++17?

How do I use unique_ptr in C++17?

In C++17, std::unique_ptr is a smart pointer that manages a dynamically allocated object. It ensures that the object is deleted when the unique_ptr goes out of scope. You can create a unique_ptr using std::make_unique<T>().

Can you show me a simple example?

Sure! Here's a simple example:

#include <iostream>
#include <memory>

int main() {
    std::unique_ptr<int> ptr = std::make_unique<int>(42);
    std::cout << *ptr << std::endl; // Outputs: 42
    return 0;
}

This creates a unique_ptr that points to an integer with the value 42.

What happens if I try to copy a unique_ptr?

You cannot copy a unique_ptr because it is designed to have sole ownership of the object it points to. If you try to copy it, you'll get a compilation error. You can, however, move it using std::move().

What are the advantages of using unique_ptr over raw pointers?

The main advantages of unique_ptr over raw pointers are automatic memory management, prevention of memory leaks, and ensuring that the object is deleted when it goes out of scope, which helps in managing resource ownership more safely.