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

 

C++

Language

Standard library headers

Concepts

Utilities library

Strings library

Containers library

Algorithms library

Iterators library

Numerics library

Input/output library

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Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

Filesystem library (C++17)

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

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

Exceptions

noexcept specification:  

noexcept

  

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)