std::experimental::weak_ptr<T>::weak_ptr
From cppreference.com
< cpp | experimental | weak ptr
| constexpr weak_ptr() noexcept; |
(1) | (library fundamentals TS) |
| weak_ptr( const weak_ptr& r ) noexcept; |
(2) | (library fundamentals TS) |
| template< class Y > weak_ptr( const weak_ptr<Y>& r ) noexcept; |
(2) | (library fundamentals TS) |
| template< class Y > weak_ptr( const std::experimental::shared_ptr<Y>& r ) noexcept; |
(2) | (library fundamentals TS) |
| weak_ptr( weak_ptr&& r ) noexcept; |
(3) | (library fundamentals TS) |
| template< class Y > weak_ptr( weak_ptr<Y>&& r ) noexcept; |
(3) | (library fundamentals TS) |
Constructs a new weak_ptr that potentially shares an object with r.
1) Default constructor. Constructs empty
weak_ptr.2) Constructs new
weak_ptr which shares an object managed by r. If r manages no object, *this manages no object too. The templated overloads don't participate in overload resolution unless either Y* is implicitly convertible to T*, or Y is the type "array of N U" for some type U and some number N, and T is the type "array of unknown bound of (possibly cv-qualified) U". 3) Move constructors. Moves a
weak_ptr instance from r into *this. After this, r is empty and r.use_count() == 0. The templated overload doesn't participate in overload resolution unless either Y* is implicitly convertible to T*, or Y is the type "array of N U" for some type U and some number N, and T is the type "array of unknown bound of (possibly cv-qualified) U".Parameters
| r | - | a std::experimental::shared_ptr or std::experimental::weak_ptr that will be viewed by this std::experimental::weak_ptr |
Exceptions
noexcept specification:
noexcept
Example
| This section is incomplete Reason: no example |
See also
creates a new weak_ptr (public member function of std::weak_ptr<T>) | |
assigns the weak_ptr (public member function of std::weak_ptr<T>) |