std::experimental::shared_future

 

C++

Compiler support

Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

Metaprogramming library (C++11)

Diagnostics library

General utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Localizations library

Input/output library

Filesystem library (C++17)

Regular expressions library (C++11)

Concurrency support library (C++11)

Execution support library (C++26)

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

 

Extensions for concurrency

std::future extensions

experimental::future

experimental::shared_future

experimental::when_all

experimental::when_any

experimental::make_ready_future

experimental::make_exceptional_future

Latches and barriers

experimental::latch

experimental::barrier

experimental::flex_barrier

Atomic smart pointers

experimental::atomic_shared_ptr

experimental::atomic_weak_ptr

 

std::experimental::shared_future

shared_future::shared_future

shared_future::operator=

shared_future::is_ready

shared_future::then

 

Defined in header <experimental/shared_future>
template< class T > class shared_future;	(1)	(concurrency TS)
template< class T > class shared_future<T&>;	(2)	(concurrency TS)
template<>          class shared_future<void>;	(3)	(concurrency TS)

The class template std::experimental::shared_future extends std::shared_future with the following operations:

• an unwrapping constructor from future<shared_future<T>>;
• a member function is_ready to query whether the associated shared state is ready; and
• a member function then to attach a continuation to the future.

There is no interoperation between std::experimental::shared_future and std::shared_future.

Member functions

(constructor)	constructs a shared_future (public member function)
is_ready	checks if the shared state is ready (public member function)
then	attaches a continuation to a shared_future (public member function)
operator=	assigns the contents (public member function)

Members identical to std::shared_future

Member functions

(destructor)	destructs the future object (public member function of std::shared_future<T>)
Getting the result
get	returns the result (public member function of std::shared_future<T>)
State
valid	checks if the future has a shared state (public member function of std::shared_future<T>)
wait	waits for the result to become available (public member function of std::shared_future<T>)
wait_for	waits for the result, returns if it is not available for the specified timeout duration (public member function of std::shared_future<T>)
wait_until	waits for the result, returns if it is not available until specified time point has been reached (public member function of std::shared_future<T>)

See also

future (concurrency TS)

a version of std::future enhanced with continuations and other features (class template)