std::experimental::weak_ptr

 

C++

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Named requirements

Feature test macros(C++20)

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Concepts library(C++20)

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Technical specifications

Symbols index

External libraries

 

Experimental

Technical Specification

Filesystem library(filesystem TS)

Library fundamentals(library fundamentals TS)

Library fundamentals 2(library fundamentals TS v2)

Library fundamentals 3(library fundamentals TS v3)

Extensions for parallelism(parallelism TS)

Extensions for parallelism 2(parallelism TS v2)

Extensions for concurrency(concurrency TS)

Extensions for concurrency 2(concurrency TS v2)

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Library fundamentals

experimental::optional

experimental::any

experimental::basic_string_view

experimental::sample

experimental::shared_ptr

experimental::weak_ptr

experimental::apply

experimental::invocation_typeexperimental::raw_invocation_type

experimental::search

experimental::default_searcherexperimental::make_default_searcher

experimental::boyer_moore_searcherexperimental::make_boyer_moore_searcher

experimental::boyer_moore_horspool_searcherexperimental::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

 

Defined in header <experimental/memory>
template<class T >class weak_ptr;		(library fundamentals TS)

std::experimental::weak_ptr is a modified version of std::weak_ptr that interoperates with std::experimental::shared_ptr and has support for arrays.

Member types

Member type	Definition
element_type	std::remove_extent_t<T>

Member functions

(constructor)

constructs new weak_ptr (public member function)

Members and non-members identical to std::weak_ptr

Member functions

The following member functions work with std::experimental::shared_ptr instead of std::shared_ptr and std::experimental::weak_ptr instead of std::weak_ptr. The behavior is otherwise identical.

(destructor)	destroys a weak_ptr (public member function of std::weak_ptr<T>)
operator=	assigns the weak_ptr (public member function of std::weak_ptr<T>)
Modifiers
reset	releases the ownership of the managed object (public member function of std::weak_ptr<T>)
swap	swaps the managed objects (public member function of std::weak_ptr<T>)
Observers
use_count	returns the number of shared_ptr objects that manage the object (public member function of std::weak_ptr<T>)
expired	checks whether the referenced object was already deleted (public member function of std::weak_ptr<T>)
lock	creates a shared_ptr that manages the referenced object (public member function of std::weak_ptr<T>)
owner_before	provides owner-based ordering of weak pointers (public member function of std::weak_ptr<T>)

Non-member functions

This non-member function is declared in the std::experimental namespace, and work with std::experimental::weak_ptr rather than std::weak_ptr, but otherwise behaves identically to the corresponding C++14 function.

std::swap(std::weak_ptr) (C++11)

specializes the std::swap algorithm (function template)