Namespace
Varianti

std::endl

Da cppreference.com.
< cpp‎ | io‎ | manip

 
 
Ingresso / libreria di output
I / O manipolatori
C-style I / O
Buffer
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(deprecato)
Streams
Original:
Streams
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Astrazioni
Original:
Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
File I / O
Original:
File I/O
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basic_ifstream
basic_ofstream
basic_fstream
String I / O
Original:
String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Array I / O
Original:
Array I/O
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istrstream(deprecato)
ostrstream(deprecato)
strstream(deprecato)
Tipi
Original:
Types
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streamoff
streamsize
fpos
Errore categoria interfaccia
Original:
Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
Ingresso / uscita manipolatori
Virgola mobile formattazione
Original:
Floating-point formatting
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Formattazione Integer
Original:
Integer formatting
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Formattazione Boolean
Original:
Boolean formatting
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boolalpha
noboolalpha
Larghezza del campo e il controllo di riempimento
Original:
Field width and fill control
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Di formattazione
Original:
Other formatting
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Elaborazione degli spazi vuoti
Original:
Whitespace processing
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Uscita di lavaggio
Original:
Output flushing
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flush
endl
Flag di stato manipolazione
Original:
Status flags manipulation
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Tempo e denaro I / O
Original:
Time and money I/O
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get_money(C++11)
get_time(C++11)
put_money(C++11)
put_time(C++11)
 
Defined in header <ostream>
template< class CharT, class Traits >
std::basic_ostream<charT,traits>& endl( std::basic_ostream<CharT, Traits>& os );
Inserisce un carattere in linea di fondo campo os sequenza di emissione e vampate come se chiamando os.put(os.widen('\n')) seguita da os.flush().
Original:
Inserts a endline character into the output sequence os and flushes it as if by calling os.put(os.widen('\n')) followed by os.flush().
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Si tratta di un solo output manipolatore di I / O, può essere chiamato con espressioni quali out << std::endl per qualsiasi out di std::basic_ostream tipo.
Original:
This is an output-only I/O manipulator, it may be called with an expression such as out << std::endl for any out of type std::basic_ostream.
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Indice

[modifica] Note

Questo manipolatore può essere usato per produrre una linea di uscita immediatamente, ad esempio durante la visualizzazione di uscita da un processo di lunga durata, la registrazione delle attività di più thread o la registrazione di attività di un programma che potrebbe bloccarsi in modo imprevisto. Un filo esplicito std::cout è necessario anche prima di una chiamata a std::system, se il processo generato esegue qualsiasi schermata I / O (un esempio comune è std::system("pause") su Windows). Nella maggior parte degli altri soliti interattivi I / O scenari, std::endl è ridondante se utilizzato con std::cout perché ogni input da std::cin, uscita std::cerr, o cessazione programma forza una chiamata a std::cout.flush(). L'uso di std::endl al posto di '\n', incoraggiato da alcune fonti, può significativamente degradare le prestazioni di uscita.
Original:
This manipulator may be used to produce a line of output immediately, e.g. when displaying output from a long-running process, logging activity of multiple threads or logging activity of a program that may crash unexpectedly. An explicit flush of std::cout is also necessary before a call to std::system, if the spawned process performs any screen I/O (a common example is std::system("pause") on Windows). In most other usual interactive I/O scenarios, std::endl is redundant when used with std::cout because any input from std::cin, output to std::cerr, or program termination forces a call to std::cout.flush(). Use of std::endl in place of '\n', encouraged by some sources, may significantly degrade output performance.
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In molte implementazioni, lo standard output è line-buffered, e '\n' scrittura provoca un colore in ogni caso, a meno che non std::cout.sync_with_stdio(false) è stato giustiziato. In tali situazioni, endl inutile degrada solo le prestazioni del file di output non standard output.
Original:
In many implementations, standard output is line-buffered, and writing '\n' causes a flush anyway, unless std::cout.sync_with_stdio(false) was executed. In those situations, unnecessary endl only degrades the performance of file output, not standard output.
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Gli esempi di codice in questo follow Bjarne Stroustrup wiki a Flushing lo standard output solo se necessario.
Original:
The code samples on this wiki follow Bjarne Stroustrup in flushing the standard output only where necessary.
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Quando una linea incompleta di uscita deve essere lavata, il manipolatore std::flush può essere utilizzato.
Original:
When an incomplete line of output needs to be flushed, the std::flush manipulator may be used.
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Quando tutti i caratteri di uscita deve essere lavata, il manipolatore std::unitbuf può essere utilizzato.
Original:
When every character of output needs to be flushed, the std::unitbuf manipulator may be used.
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[modifica] Parametri

os -
riferimento al flusso di output
Original:
reference to output stream
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[modifica] Valore di ritorno

os (riferimento al flusso dopo la manipolazione)
Original:
os (reference to the stream after manipulation)
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[modifica] Esempio

Con \ n invece di endl, il risultato sarebbe lo stesso, ma potrebbero non essere visualizzate in tempo reale .
Original:
With \n instead of endl, the output would be the same, but may not appear in real time.
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#include <iostream>
#include <chrono>
template<typename Diff>
void log_progress(Diff d)
{
    std::cout << std::chrono::duration_cast<std::chrono::milliseconds>(d).count()
              << " ms passed" << std::endl;
}
int main()
{
    std::cout.sync_with_stdio(false); // on some platforms, stdout flushes on \n
    volatile int sink=0;
 
    auto t1 = std::chrono::high_resolution_clock::now();
    for(int j=0; j<5; ++j)
    {
        for(int n=0; n<10000; ++n)
            for(int m=0; m<20000; ++m)
                sink += m*n; // do some work
        auto now = std::chrono::high_resolution_clock::now();
        log_progress(now - t1);
    }
}

Output:

487 ms passed
974 ms passed
1470 ms passed
1965 ms passed
2455 ms passed

[modifica] Vedi anche

controlla se l'uscita viene lavata dopo ogni operazione
Original:
controls whether output is flushed after each operation
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(funzione) [edit]
svuota il flusso di output
Original:
flushes the output stream
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(funzione di modello) [edit]
sincronizza con il dispositivo di archiviazione sottostante
Original:
synchronizes with the underlying storage device
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(membro pubblico of std::basic_ostream funzione) [edit]