std::thread::thread
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thread(); |
(1) | (dal C++11) |
thread( thread&& other ); |
(2) | (dal C++11) |
template< class Function, class... Args > explicit thread( Function&& f, Args&&... args ); |
(3) | (dal C++11) |
thread(const thread&) = delete; |
(4) | (dal C++11) |
Costruisce oggetto nuova discussione.
Original:
Constructs new thread object.
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1)
Crea nuovo oggetto thread che non rappresenta un filo.
Original:
Creates new thread object which does not represent a thread.
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2)
Sposta costruttore. Costruisce l'oggetto thread per rappresentare il thread di esecuzione che è stata rappresentata da
other. Dopo questa chiamata other non rappresenta più un thread di esecuzione.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 After this call other no longer represents a thread of execution.The text has been machine-translated via Google Translate.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)
Crea nuovo
std::thread oggetto e lo associa un thread di esecuzione. In primo luogo il costruttore copia tutti args... argomenti per thread-local storage come se per la funzione: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);
}
@ @ Tutte le eccezioni generate durante la valutazione e la copia degli argomenti vengono gettati nel thread corrente non, il nuovo 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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@ @ Il codice che verrà eseguito nel nuovo thread è definito come segue. Facciamo riferimento al None
copied_args come t1, t2,..., tN, dove N è 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:
- Se
fè puntatore a una funzione membro della classeT, allora si chiama. Il valore restituito viene ignorato. In effetti, il codice riportato di seguito viene eseguito: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)se il tipo dit1è oT, il riferimento aTo riferimenti alle tipo derivato daT.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)altrimenti.Original:((*t1).*f)(t2, ..., tN)otherwise.The text has been machine-translated via Google Translate.
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- Se
N == 1efè puntatore a un oggetto membro dati di una classe, quindi vi si accede. Il valore dell'oggetto viene ignorato. In effetti, il codice riportato di seguito viene eseguito: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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t1.*fse e il tipo dit1è oT, riferimento allaTo riferimento tipo derivato daT.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).*faltrimenti.Original:(*t1).*fotherwise.The text has been machine-translated via Google Translate.
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fsi chiama come un puntatore a una funzione non membro in tutti gli altri casi. Il valore restituito viene ignorato. In effetti,f(t1, t2, ..., tN)viene eseguito.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. Facciamo riferimento al None
copied_args come t1, t2,..., tN, dove N è 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:
- Se
fè puntatore a una funzione membro della classeT, allora si chiama. Il valore restituito viene ignorato. In effetti, il codice riportato di seguito viene eseguito: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)se il tipo dit1è oT, il riferimento aTo riferimenti alle tipo derivato daT.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)altrimenti.Original:((*t1).*f)(t2, ..., tN)otherwise.The text has been machine-translated via Google Translate.
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- Se
N == 1efè puntatore a un oggetto membro dati di una classe, quindi vi si accede. Il valore dell'oggetto viene ignorato. In effetti, il codice riportato di seguito viene eseguito: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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t1.*fse e il tipo dit1è oT, riferimento allaTo riferimento tipo derivato daT.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).*faltrimenti.Original:(*t1).*fotherwise.The text has been machine-translated via Google Translate.
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fsi chiama come un puntatore a una funzione non membro in tutti gli altri casi. Il valore restituito viene ignorato. In effetti,f(t1, t2, ..., tN)viene eseguito.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)
Il costruttore di copia, è soppresso il thread non sono copiabili. Non ci sono due
std::thread oggetti possono rappresentare lo stesso thread di esecuzione.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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Parametri
| other | - | un altro oggetto thread per costruire questo oggetto filo con
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 | - | funzione da eseguire nel nuovo 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... | - | argomenti da passare alla nuova funzione
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. |
Eccezioni
1-2)
3)
std::system_error se il thread non può essere avviato. L'eccezione può rappresentare il
std::errc::resource_unavailable_try_again condizione di errore o un'altra implementazione specifica condizione di errore.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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Note
Gli argomenti della funzione di thread vengono copiati per valore. Se un argomento di riferimento deve essere passato alla funzione thread, deve essere avvolto (ad esempio con std::ref o 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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Qualsiasi valore restituito dalla funzione viene ignorata. Se la funzione genera un'eccezione, std::terminate si chiama. Per superare i valori di ritorno o eccezioni nuovo al thread chiamante, std::promise o std::async può essere utilizzato.
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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Esempio
#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';
}
Possible output:
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