Replaces the value in a std::experimental::weak_ptr with the value in another
std::experimental::weak_ptr, transferring ownership
from the supplied std::experimental::weak_ptr to *this.
template<typename Other> weak_ptr& operator=(weak_ptr<Other>&& other) noexcept;
template<typename Other> weak_ptr& operator=(weak_ptr<Other>&& other) noexcept{ weak_ptr temp(std::move(other)); this->swap(temp); return *this; }
#include <experimental/atomic>