std::cerr, std::wcerr
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| Elemento definito nell'header <iostream>
|
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| extern std::ostream cerr; |
(1) | |
| extern std::wostream wcerr; |
(2) | |
Gli oggetti globali std::cerr e std::wcerr uscita di controllo ad un buffer del flusso di attuazione tipo definito (derivato da std::streambuf e std::wstreambuf, rispettivamente), associato al flusso di output di errore standard di C stderr.
Original:
The global objects std::cerr and std::wcerr control output to a stream buffer of implementation-defined type (derived from std::streambuf and std::wstreambuf, respectively), associated with the standard C error output stream stderr.
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Questi oggetti sono garantiti per essere costruito prima del primo costruttore di un oggetto statico viene chiamato e sono garantiti per sopravvivere distruttore ultimo di un oggetto statico, in modo che sia sempre possibile scrivere std::cerr nel codice utente.
Original:
These objects are guaranteed to be constructed before the first constructor of a static object is called and they are guaranteed to outlive the last destructor of a static object, so that it is always possible to write to std::cerr in user code.
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A meno che sync_with_stdio(false) è stato rilasciato, è sicuro per accedere a questi oggetti contemporaneamente da più thread sia per l'output formattato e non formattati.
Original:
Unless sync_with_stdio(false) has been issued, it is safe to concurrently access these objects from multiple threads for both formatted and unformatted output.
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Una volta inizializzato, std::cerr.flags() & unitbuf != 0 (lo stesso per
wcerr) il che significa che ogni uscita inviata a questi oggetti flusso viene immediatamente scaricato sul sistema operativo (tramite distruttore std::basic_ostream::sentry di).Original:
Once initialized, std::cerr.flags() & unitbuf != 0 (same for
wcerr) meaning that any output sent to these stream objects is immediately flushed to the OS (via std::basic_ostream::sentry's destructor).The text has been machine-translated via Google Translate.
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Inoltre, std::cerr.tie() torna &std::cout (uguale per
wcerr e wcout), il che significa che qualsiasi operazione di uscita sul std::cerr eseguito per primo std::cout.flush() (tramite il costruttore di std::basic_ostream::sentry) (dal C++11)Original:
In addition, std::cerr.tie() returns &std::cout (same for
wcerr and wcout), meaning that any output operation on std::cerr first executes std::cout.flush() (via std::basic_ostream::sentry's constructor) (dal C++11)The text has been machine-translated via Google Translate.
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[modifica] Esempio
output stderr con vampate cerr fuori l'uscita in attesa di cout, mentre la produzione di stderr tramite zoccolo non lo fa
Original:
output to stderr via cerr flushes out the pending output on cout, while output to stderr via clog does not
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#include <thread> #include <iostream> #include <chrono> void f() { std::cout << "Output from thread..."; std::this_thread::sleep_for(std::chrono::seconds(2)); std::cout << "...thread calls flush()" << std::endl; } int main() { std::thread t1(f); std::this_thread::sleep_for(std::chrono::seconds(1)); std::clog << "This output from main is not tie()'d to cout\n"; std::cerr << "This output is tie()'d to cout\n"; t1.join(); }
Output:
This output from main is not tie()'d to cout Output from thread...This output is tie()'d to cout ...thread calls flush()
[modifica] Vedi anche
| inizializza oggetti stream standard Original: initializes standard stream objects The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (membro pubblico of std::ios_base classe)
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| scrive allo standard stderr
(oggetto globale) flusso di errore C Original: The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. | |
| scrive nel flusso di output standard di stdout
(oggetto globale) C Original: The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. | |
