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std::experimental::atomic_weak_ptr::atomic_weak_ptr

From cppreference.com
constexpr atomic_weak_ptr() noexcept;
(1)
constexpr atomic_weak_ptr( weak_ptr<T> desired ) noexcept;
(2)
atomic_weak_ptr( const atomic_weak_ptr& ) = delete;
(3)

Constructs a new atomic_weak_ptr object.

1) The default constructor initializes the object to an empty state.
2) Initializes the underlying weak_ptr<T> with desired. The initialization is not atomic.
3) Atomic variables are not CopyConstructible.

[edit] Parameters

desired - value to initialize with