std::thread::thread
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thread(); |
(1) | (depuis C++11) |
thread( thread&& other ); |
(2) | (depuis C++11) |
template< class Function, class... Args > explicit thread( Function&& f, Args&&... args ); |
(3) | (depuis C++11) |
thread(const thread&) = delete; |
(4) | (depuis C++11) |
Construit objet nouveau thread .
Original:
Constructs new thread object.
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1)
Cre un objet nouveau thread qui ne reprsente pas un fil .
Original:
Creates new thread object which does not represent a thread.
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2)
Dplacez constructeur. Construit l'objet thread pour reprsenter le thread d'excution qui a t reprsent par
other. Aprs cet appel other ne reprsente plus un thread d'excution .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 After this call other no longer represents a thread of execution.The text has been machine-translated via Google Translate.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)
Cre un nouveau
std::thread objet et l'associe un thread d'excution. D'abord le constructeur de copie toutes args... arguments pour stockage local des threads comme par la fonction: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);
}
@ @ Toutes les exceptions leves lors de l'valuation et de la copie des arguments sont jets dans le thread en cours, et non pas le nouveau thread .
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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@ @ Le code qui sera excut dans le nouveau thread est dfini comme suit.
Nous allons consulter None
copied_args comme t1, t2, ..., tN, o N est 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:Original:
Let's refer to None
copied_args as t1, t2, ..., tN, where N is 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:The text has been machine-translated via Google Translate.
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- Si
fest un pointeur vers une fonction membre de la classeT, il est alors appel. La valeur de retour est ignore. En effet, le code suivant est excut: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)si le type det1est soitT, la rfrenceTou de rfrence taper driv deT.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)autrement .Original:((*t1).*f)(t2, ..., tN)otherwise.The text has been machine-translated via Google Translate.
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- Si
N == 1etfest pointeur vers un objet membre de donnes d'une classe, il est alors accessible. La valeur de l'objet est ignor. En effet, le code suivant est excut:Original:IfN == 1andfis 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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- Si
t1.*fet du type det1est soitT, ou rfrenceTrfrence au type driv deT.Original:t1.*fif 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).*fautrement .Original:(*t1).*fotherwise.The text has been machine-translated via Google Translate.
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fest appel comme un pointeur vers une fonction non-membre dans les autres cas. La valeur de retour est ignore. En effet,f(t1, t2, ..., tN)est excut .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.
Nous allons consulter None
copied_args comme t1, t2, ..., tN, o N est 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:Original:
Let's refer to None
copied_args as t1, t2, ..., tN, where N is 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:The text has been machine-translated via Google Translate.
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- Si
fest un pointeur vers une fonction membre de la classeT, il est alors appel. La valeur de retour est ignore. En effet, le code suivant est excut: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)si le type det1est soitT, la rfrenceTou de rfrence taper driv deT.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)autrement .Original:((*t1).*f)(t2, ..., tN)otherwise.The text has been machine-translated via Google Translate.
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- Si
N == 1etfest pointeur vers un objet membre de donnes d'une classe, il est alors accessible. La valeur de l'objet est ignor. En effet, le code suivant est excut:Original:IfN == 1andfis 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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- Si
t1.*fet du type det1est soitT, ou rfrenceTrfrence au type driv deT.Original:t1.*fif 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).*fautrement .Original:(*t1).*fotherwise.The text has been machine-translated via Google Translate.
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fest appel comme un pointeur vers une fonction non-membre dans les autres cas. La valeur de retour est ignore. En effet,f(t1, t2, ..., tN)est excut .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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4)
Le constructeur de copie est supprime; fils ne sont pas copiable. Il n'ya pas deux
std::thread objets peuvent reprsenter le mme thread d'excution .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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Paramtres
| other | - | un autre objet thread pour construire cet objet thread avec
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 | - | fonctionner excuter dans le nouveau thread
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... | - | arguments passer la nouvelle fonction
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. |
Exceptions
1-2)
3)
std::system_error si le thread n'a pas pu tre dmarr. L'exception peut reprsenter le
std::errc::resource_unavailable_try_again condition d'erreur ou d'une autre condition d'erreur spcifique l'implmentation .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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Notes
Les arguments de la fonction de thread sont copies par valeur. Si un argument de rfrence doit tre pass la fonction de thread, il doit tre envelopp (par exemple avec std::ref ou 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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Toute valeur de retour de la fonction est ignore. Si la fonction lve une exception, std::terminate est appele. Afin de passer des valeurs de retour ou des exceptions au thread, appelez ou std::promise std::async peut tre utilis .
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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Exemple
#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';
}
Rsultat possible :
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