std::thread::thread
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| thread(); |
(1) | (начиная с C++11) |
| thread( thread&& other ); |
(2) | (начиная с C++11) |
| template< class Function, class... Args > explicit thread( Function&& f, Args&&... args ); |
(3) | (начиная с C++11) |
| thread(const thread&) = delete; |
(4) | (начиная с C++11) |
Создает новый объект потока.
Original:
Constructs new thread object.
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1)
Создает новый объект потока, который не представляет собой поток.
Original:
Creates new thread object which does not represent a thread.
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2)
Переместить конструктор. Создает объект потока представляют поток исполнения, который был представлен
other. После этого вызова other больше не представляет поток выполнения.Original:
Move constructor. Constructs the thread object to represent the thread of execution that was represented by
other. After this call other no longer represents a thread of execution.The text has been machine-translated via Google Translate.
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3)
Создает новый объект
std::thread и связывает его с потоком выполнения. Первый конструктор копирует все аргументы args... к локальной памяти потока, как по функции:Original:
Creates new
std::thread object and associates it with a thread of execution. First the constructor copies all arguments args... to thread-local storage as if by the function:The text has been machine-translated via Google Translate.
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template <class T> typename decay<T>::type decay_copy(T&& v) { return std::forward<T>(v); }
@ @ Любые исключения, при оценке и копирование аргументов бросают в текущем потоке, а не новый нить.
Original:
@@ Any exceptions thrown during evaluation and copying of the arguments are thrown in the current thread, not the new thread.
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@ @ Код, который будет выполняться в новом потоке определяется следующим образом. Обратимся к None
copied_args, как t1, t2,..., tN, где N является sizeof...(copied_args)and copied_args is the result of calling decay_copy as defined above. The following code will be run in the new thread: - Если
fявляется указателем на функцию-член классаT, то она называется. Возвращаемое значение игнорируется. По сути, выполняется следующий код:Original:Iffis pointer to a member function of classT, then it is called. The return value is ignored. Effectively, the following code is executed:The text has been machine-translated via Google Translate.
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- (t1.*f)(t2, ..., tN), если тип
t1либоT, ссылка наTили ссылка на тип, производный отT.Original:(t1.*f)(t2, ..., tN) if the type oft1is eitherT, reference toTor reference to type derived fromT.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions. - ((*t1).*f)(t2, ..., tN) иначе.Original:((*t1).*f)(t2, ..., tN) otherwise.The text has been machine-translated via Google Translate.
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-
- Если N == 1 и
fявляется указателем на объект элемента данных класса, то при обращении к нему. Стоимость объекта игнорируются. По сути, выполняется следующий код:Original:If N == 1 andfis pointer to a member data object of a class, then it is accessed. The value of the object is ignored. Effectively, the following code is executed:The text has been machine-translated via Google Translate.
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- t1.*f если и тип
t1либоT, ссылка наTили ссылка на тип, производный отT.Original:t1.*f if and the type oft1is eitherT, reference toTor reference to type derived fromT.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions. - (*t1).*f иначе.Original:(*t1).*f otherwise.The text has been machine-translated via Google Translate.
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-
-
fназывается указателем на не являющихся членами функции во всех остальных случаях. Возвращаемое значение игнорируется. По сути, f(t1, t2, ..., tN) выполняется.Original:fis called as a pointer to a non-member function in all other cases. The return value is ignored. Effectively, f(t1, t2, ..., tN) is executed.The text has been machine-translated via Google Translate.
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Original:
@@ The code that will be run in the new thread is defined as follows. Обратимся к None
copied_args, как t1, t2,..., tN, где N является sizeof...(copied_args)and copied_args is the result of calling decay_copy as defined above. The following code will be run in the new thread: - Если
fявляется указателем на функцию-член классаT, то она называется. Возвращаемое значение игнорируется. По сути, выполняется следующий код:Original:Iffis pointer to a member function of classT, then it is called. The return value is ignored. Effectively, the following code is executed:The text has been machine-translated via Google Translate.
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- (t1.*f)(t2, ..., tN), если тип
t1либоT, ссылка наTили ссылка на тип, производный отT.Original:(t1.*f)(t2, ..., tN) if the type oft1is eitherT, reference toTor reference to type derived fromT.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions. - ((*t1).*f)(t2, ..., tN) иначе.Original:((*t1).*f)(t2, ..., tN) otherwise.The text has been machine-translated via Google Translate.
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-
- Если N == 1 и
fявляется указателем на объект элемента данных класса, то при обращении к нему. Стоимость объекта игнорируются. По сути, выполняется следующий код:Original:If N == 1 andfis pointer to a member data object of a class, then it is accessed. The value of the object is ignored. Effectively, the following code is executed:The text has been machine-translated via Google Translate.
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- t1.*f если и тип
t1либоT, ссылка наTили ссылка на тип, производный отT.Original:t1.*f if and the type oft1is eitherT, reference toTor reference to type derived fromT.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions. - (*t1).*f иначе.Original:(*t1).*f otherwise.The text has been machine-translated via Google Translate.
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-
-
fназывается указателем на не являющихся членами функции во всех остальных случаях. Возвращаемое значение игнорируется. По сути, f(t1, t2, ..., tN) выполняется.Original:fis called as a pointer to a non-member function in all other cases. The return value is ignored. Effectively, f(t1, t2, ..., tN) is executed.The text has been machine-translated via Google Translate.
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The text has been machine-translated via Google Translate.
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4)
Конструктор копирования удаляется; темы, не копируемой. Нет двух
std::thread объекты могут представлять собой тот же поток исполнения.Original:
The copy constructor is deleted; threads are not copyable. No two
std::thread objects may represent the same thread of execution.The text has been machine-translated via Google Translate.
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Содержание |
[править] Параметры
| other | - | другой объект потока, чтобы построить этот объект потока с
Original: another thread object to construct this thread object with The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| f | - | Функция для выполнения в новом потоке
Original: function to execute in the new thread The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| args... | - | Аргументы перейти к новой функции
Original: arguments to pass to the new function The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
[править] Исключения
1-2)
3)
std::system_error, если поток не может быть запущен. Исключение может представлять
std::errc::resource_unavailable_try_again ошибке или другой конкретной реализации ошибку.Original:
std::system_error if the thread could not be started. The exception may represent the error condition
std::errc::resource_unavailable_try_again or another implementation-specific error condition.The text has been machine-translated via Google Translate.
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[править] Notes
Аргументы функции потока копируются по значению. Если ссылочный аргумент должен быть передан функции потока, он должен быть обернут (например, с std::ref или std::cref).
Original:
The arguments to the thread function are copied by value. If a reference argument needs to be passed to the thread function, it has to be wrapped (e.g. with std::ref or std::cref).
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Любой возвращаемого значения функции игнорируется. Если функция генерирует исключение, std::terminate называется. Для того чтобы пройти возвращаемых значений или исключений обратно в вызывающую нить, std::promise или std::async могут быть использованы.
Original:
Any return value from the function is ignored. If the function throws an exception, std::terminate is called. In order to pass return values or exceptions back to the calling thread, std::promise or std::async may be used.
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[править] Пример
#include <iostream> #include <utility> #include <thread> #include <chrono> #include <functional> #include <atomic> void f1(int n) { for(int i=0; i<5; ++i) { std::cout << "Thread " << n << " executing\n"; std::this_thread::sleep_for(std::chrono::milliseconds(10)); } } void f2(int& n) { for(int i=0; i<5; ++i) { std::cout << "Thread 2 executing\n"; ++n; std::this_thread::sleep_for(std::chrono::milliseconds(10)); } } int main() { int n = 0; std::thread t1; // t1 is not a thread std::thread t2(f1, n+1); // pass by value std::thread t3(f2, std::ref(n)); // pass by reference std::thread t4(std::move(t3)); // t4 is now running f2(). t3 is no longer a thread t2.join(); t4.join(); std::cout << "Final value of n is " << n << '\n'; }
Возможный вывод:
Thread 1 executing Thread 2 executing Thread 1 executing Thread 2 executing Thread 1 executing Thread 2 executing Thread 1 executing Thread 2 executing Thread 1 executing Thread 2 executing Final value of n is 5