What are some unique pointer examples in C++?

Can you explain what a unique pointer is in C++?

A unique pointer is a smart pointer that owns a dynamically allocated object exclusively. It ensures that there is only one unique pointer to a resource, preventing memory leaks.

Can you give me some examples of how to use unique pointers?

Sure! Here's a simple example:

#include <iostream>
#include <memory>

int main() {
    std::unique_ptr<int> ptr = std::make_unique<int>(10);
    std::cout << *ptr << std::endl; // Outputs: 10
    return 0;
}

What happens if I try to copy a unique pointer?

If you try to copy a unique pointer, it will result in a compilation error because unique pointers cannot be copied. They can only be moved.

Can you show me how to transfer ownership of a unique pointer?

Certainly! You can transfer ownership using std::move:

std::unique_ptr<int> ptr1 = std::make_unique<int>(20);
std::unique_ptr<int> ptr2 = std::move(ptr1);
// Now ptr1 is nullptr and ptr2 owns the resource.