std::experimental::weak_ptr::weak_ptr

 

C++

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Technical Specifications

 

Technical specifications

Filesystem library (filesystem TS)

Library fundamentals (library fundamentals TS)

Library fundamentals 2 (library fundamentals 2 TS)

Extensions for parallelism (parallelism TS)

Extensions for concurrency (concurrency TS)

Concepts (concepts TS)

Ranges (ranges TS)

Special mathematical functions (special math TR)

 

Library fundamentals

experimental::optional

experimental::any

experimental::basic_string_view

experimental::sample

experimental::shared_ptr

experimental::weak_ptr

experimental::apply

experimental::invocation_type experimental::raw_invocation_type

experimental::search

experimental::default_searcher experimental::make_default_searcher

experimental::boyer_moore_searcher experimental::make_boyer_moore_searcher

experimental::boyer_moore_horspool_searcher experimental::make_boyer_moore_horspool_searcher

type-erased and polymorphic allocators

variable templates for type traits

 

std::experimental::weak_ptr

weak_ptr::weak_ptr

Members and non-members identical to those of std::weak_ptr

 

constexpr weak_ptr();	(1)	(library fundamentals TS)
weak_ptr( const weak_ptr& r );	(2)	(library fundamentals TS)
template< class Y > weak_ptr( const weak_ptr<Y>& r );	(2)	(library fundamentals TS)
template< class Y > weak_ptr( const std::experimental::shared_ptr<Y>& r );	(2)	(library fundamentals TS)
weak_ptr( weak_ptr&& r );	(3)	(library fundamentals TS)
template< class Y > weak_ptr( weak_ptr<Y>&& r );	(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 Y* is implicitly convertible to T*.

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

  

See also

(constructor)	creates a new weak_ptr (public member function of std::weak_ptr)
operator=	assigns the weak_ptr (public member function of std::weak_ptr)