std::shared_future<T>::shared_future

 

C++

Language

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Freestanding and hosted implementations

Named requirements

Language support library

Concepts library (C++20)

Diagnostics library

Utilities library

Strings library

Containers library

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Ranges library (C++20)

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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

 

Thread support library

Threads
thread (C++11)
jthread (C++20)
stop_token (C++20)
stop_source (C++20)
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hardware_destructive_interference_sizehardware_constructive_interference_size (C++17)(C++17)
this_thread namespace
get_id (C++11) yield (C++11)	sleep_for (C++11) sleep_until (C++11)
Mutual exclusion
mutex (C++11) recursive_mutex (C++11) shared_mutex (C++17)	timed_mutex (C++11) recursive_timed_mutex (C++11) shared_timed_mutex (C++14)
Generic lock management
lock_guard (C++11) scoped_lock (C++17) unique_lock (C++11) shared_lock (C++14) defer_lock_ttry_to_lock_tadopt_lock_t (C++11)(C++11)(C++11)	lock (C++11) try_lock (C++11) defer_locktry_to_lockadopt_lock (C++11)(C++11)(C++11) once_flag (C++11) call_once (C++11)
Condition variables
condition_variable (C++11)
condition_variable_any (C++11)
notify_all_at_thread_exit (C++11)
cv_status (C++11)
Semaphores
counting_semaphorebinary_semaphore (C++20)(C++20)
Latches and barriers
latch (C++20)
barrier (C++20)
Futures
promise (C++11) future (C++11) shared_future (C++11) packaged_task (C++11) async (C++11)	launch (C++11) future_status (C++11) future_error (C++11) future_category (C++11) future_errc (C++11)

 

std::shared_future

Member functions

shared_future::shared_future

shared_future::~shared_future

shared_future::operator=

Getting the result

shared_future::get

State

shared_future::valid

shared_future::wait

shared_future::wait_for

shared_future::wait_until

 

shared_future() noexcept;	(1)	(since C++11)
	(2)
shared_future( const shared_future& other );			(since C++11) (until C++17)
shared_future( const shared_future& other ) noexcept;			(since C++17)
shared_future( std::future<T>&& other ) noexcept;		(3)	(since C++11)
shared_future( shared_future&& other ) noexcept;		(4)	(since C++11)

Constructs a new shared_future.

1) Default constructor. Constructs an empty shared future, that doesn't refer to a shared state, that is valid() == false.

2) Constructs a shared future that refers to the same shared state, if any, as other.

3-4) Transfers the shared state held by other to *this. After the construction, other.valid() == false, and this->valid() returns the same value as other.valid() would have returned before the construction.

Parameters

other

-

another future object to initialize with