| CARVIEW |
Select Language
HTTP/1.1 301 Moved Permanently
Server: nginx
Date: Wed, 23 Jul 2025 10:19:24 GMT
Content-Type: text/html; charset=UTF-8
Transfer-Encoding: chunked
Connection: keep-alive
Location: /reference/future/future/future/
HTTP/1.1 200 OK
Server: nginx
Date: Wed, 23 Jul 2025 10:19:24 GMT
Content-Type: text/html; charset=utf-8
Transfer-Encoding: chunked
Connection: keep-alive
ETag: W/"72e0-yzioidBoouM0jmD+9cv9uTnhCas"
Content-Encoding: gzip
Constructs a future object:
Futures with valid shared states can only be initially constructed by certain provider functions, such as async, promise::get_future or packaged_task::get_future.
Output:
Reference
C library:
- <cassert> (assert.h)
- <cctype> (ctype.h)
- <cerrno> (errno.h)
-
<cfenv> (fenv.h)C++11
- <cfloat> (float.h)
-
<cinttypes> (inttypes.h)C++11
- <ciso646> (iso646.h)
- <climits> (limits.h)
- <clocale> (locale.h)
- <cmath> (math.h)
- <csetjmp> (setjmp.h)
- <csignal> (signal.h)
- <cstdarg> (stdarg.h)
-
<cstdbool> (stdbool.h)C++11
- <cstddef> (stddef.h)
-
<cstdint> (stdint.h)C++11
- <cstdio> (stdio.h)
- <cstdlib> (stdlib.h)
- <cstring> (string.h)
-
<ctgmath> (tgmath.h)C++11
- <ctime> (time.h)
-
<cuchar> (uchar.h)C++11
- <cwchar> (wchar.h)
- <cwctype> (wctype.h)
Containers:
-
<array>C++11
- <deque>
-
<forward_list>C++11
- <list>
- <map>
- <queue>
- <set>
- <stack>
-
<unordered_map>C++11
-
<unordered_set>C++11
- <vector>
-
Input/Output:
Multi-threading:
-
<atomic>C++11
-
<condition_variable>C++11
-
<future>C++11
-
<mutex>C++11
-
<thread>C++11
-
Other:
- <algorithm>
- <bitset>
-
<chrono>C++11
-
<codecvt>C++11
- <complex>
- <exception>
- <functional>
-
<initializer_list>C++11
- <iterator>
- <limits>
- <locale>
- <memory>
- <new>
- <numeric>
-
<random>C++11
-
<ratio>C++11
-
<regex>C++11
- <stdexcept>
- <string>
-
<system_error>C++11
-
<tuple>C++11
-
<type_traits>C++11
-
<typeindex>C++11
- <typeinfo>
- <utility>
- <valarray>
<future>
classes
-
futureC++11
-
future_errorC++11
-
packaged_taskC++11
-
promiseC++11
-
shared_futureC++11
-
enum classes
-
future_errcC++11
-
future_statusC++11
-
launchC++11
-
functions
-
asyncC++11
-
future_categoryC++11
-
future
-
future::~futureC++11
-
future::futureC++11
member functions
-
future::getC++11
-
future::operator=C++11
-
future::shareC++11
-
future::validC++11
-
future::waitC++11
-
future::wait_forC++11
-
future::wait_untilC++11
-
public member function
<future>
std::future::future
| default (1) | future() noexcept; |
|---|---|
| copy [deleted] (2) | future (const future&) = delete; |
| move (3) | future (future&& x) noexcept; |
Construct future
- (1) default constructor
- Constructs an empty future: The object has no shared state, and thus is not valid, but it can be move-assigned another future value.
- (2) copy constructor [deleted]
- future objects cannot be copied (see shared_future for a copyable future class).
- (3) move constructor
- The constructed object acquires the shared state of x (if any).
x is left with no shared state (it is no longer valid).
Futures with valid shared states can only be initially constructed by certain provider functions, such as async, promise::get_future or packaged_task::get_future.
Parameters
- x
- Another future object of the same type (with the same template parameter, T).
Example
|
|
Output:
value: 10 |
Data races
The move constructor (3) modifies x.Exception safety
No-throw guarantee: never throws exceptions.See also
- future::operator=
- Move-assign future (public member function)
- future::get
- Get value (public member function)
Home page | Privacy policy
© cplusplus.com, 2000-2025 - All rights reserved - v3.3.4s
Spotted an error? contact us
© cplusplus.com, 2000-2025 - All rights reserved - v3.3.4s
Spotted an error? contact us