void reset() noexcept;
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// weak_ptr::reset example
#include <iostream>
#include <memory>
int main () {
std::shared_ptr<int> sp (new int(10));
std::weak_ptr<int> wp(sp);
std::cout << "1. wp " << (wp.expired()?"is":"is not") << " expired\n";
wp.reset();
std::cout << "2. wp " << (wp.expired()?"is":"is not") << " expired\n";
return 0;
}1. wp is not expired 2. wp is expired