Transferring Ownership with std::move

Medium Dynamic Memory & Smart Pointers

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Problem Statement

Create a `std::unique_ptr ptr1` containing an integer read from input. Use `std::move` to transfer ownership of the pointer to `ptr2`. Check if `ptr1` is now null; if so, print ‘ptr1 empty’. Then print ‘ptr2: [val]’.

Input Format

A single integer.

Output Format

Print the status of both pointers.

Constraints

None

Sample Input

Sample Output

ptr1 empty
ptr2: 77

Explanation

Because unique_ptrs are exclusive, they cannot be copied. Their ownership must be explicitly 'moved' to another pointer, leaving the original pointer empty.

Starter Code

#include <iostream>
#include <memory>
#include <utility>

int main() {
    int val;
    if (std::cin >> val) {
        // Transfer ownership using std::move and verify
    }
    return 0;
}

Limits

Time Limit: 1s
Memory Limit: 256MB

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