void swap (weak_ptr& x) noexcept;
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// weak_ptr::swap example
#include <iostream>
#include <memory>
int main () {
std::shared_ptr<int> sp1 (new int(10));
std::shared_ptr<int> sp2 (new int(20));
std::weak_ptr<int> wp1(sp1);
std::weak_ptr<int> wp2(sp2);
wp1.swap(wp2);
std::cout << "sp1 -> " << *sp1 << '\n';
std::cout << "sp2 -> " << *sp2 << '\n';
std::cout << "wp1 -> " << *wp1.lock() << '\n';
std::cout << "wp2 -> " << *wp2.lock() << '\n';
return 0;
}sp1 -> 10 sp2 -> 20 wp1 -> 20 wp2 -> 10