std::experimental::static_pointer_cast, std::experimental::dynamic_pointer_cast, std::experimental::const_pointer_cast, std::experimental::reinterpret_pointer_cast

 

C++

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Standard library

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

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Metaprogramming library (C++11)

General utilities library

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Iterators library

Ranges library (C++20)

Algorithms library

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Filesystem library (C++17)

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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)

Concepts (concepts TS)

Ranges (ranges TS)

Reflection (reflection TS)

Mathematical special functions (special functions TR)

Experimental Non-TS

Pattern Matching

Linear Algebra

std::execution

Contracts

2D Graphics

 

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::shared_ptr

Member functions

shared_ptr::shared_ptr

shared_ptr::get

shared_ptr::operator*shared_ptr::operator->

shared_ptr::operator[]

Non-member functions

experimental::static_pointer_castexperimental::dynamic_pointer_castexperimental::const_pointer_castexperimental::reinterpret_pointer_cast

std::hash

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

 

template< class T, class U > std::experimental::shared_ptr<T> static_pointer_cast( const std::experimental::shared_ptr<U>& r ) noexcept;	(1)	(library fundamentals TS)
template< class T, class U > std::experimental::shared_ptr<T> dynamic_pointer_cast( const std::experimental::shared_ptr<U>& r ) noexcept;	(2)	(library fundamentals TS)
template< class T, class U > std::experimental::shared_ptr<T> const_pointer_cast( const std::experimental::shared_ptr<U>& r ) noexcept;	(3)	(library fundamentals TS)
template< class T, class U > std::experimental::shared_ptr<T> reinterpret_pointer_cast( const std::experimental::shared_ptr<U>& r ) noexcept;	(4)	(library fundamentals TS)

See More

Creates a new instance of std::experimental::shared_ptr whose stored pointer is obtained from r's stored pointer using a cast expression. If r is empty, so is the new shared_ptr (but its stored pointer is not necessarily null).

Otherwise, the new shared_ptr will share ownership with r, except that it is empty if the dynamic_cast performed by dynamic_pointer_cast returns a null pointer.

Let Y be typename std::experimental::shared_ptr<T>::element_type, then the resulting std::experimental::shared_ptr's stored pointer will be obtained by calling (in respective order):

1) static_cast<Y*>(r.get()).

2) dynamic_cast<Y*>(r.get()) (if the result of the dynamic_cast is a null pointer value, the returned shared_ptr will be empty).

3) const_cast<Y*>(r.get()).

4) reinterpret_cast<Y*>(r.get()).

The behavior of these functions is undefined unless the corresponding cast from U* to T* is well formed:

1) The behavior is undefined unless static_cast<T*>((U*)nullptr) is well formed.

2) The behavior is undefined unless dynamic_cast<T*>((U*)nullptr) is well formed.

3) The behavior is undefined unless const_cast<T*>((U*)nullptr) is well formed.

4) The behavior is undefined unless reinterpret_cast<T*>((U*)nullptr) is well formed.

Parameters

r

-

the pointer to convert

Example

See also

(constructor)	constructs new shared_ptr (public member function)
static_pointer_castdynamic_pointer_castconst_pointer_castreinterpret_pointer_cast (C++17)	applies static_cast, dynamic_cast, const_cast, or reinterpret_cast to the stored pointer (function template)