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std::basic_ostream::operator<<

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< cpp‎ | io‎ | basic ostream

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C++
 
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)
 
std::basic_ostream
Gli oggetti globali
Original:
Global objects
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Membri funzioni
Original:
Member functions
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basic_ostream::basic_ostream
basic_ostream::~basic_ostream
basic_ostream::operator=(C++11)
Ingresso formattato
Original:
Formatted input
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basic_ostream::operator<<
Ingresso non formattato
Original:
Unformatted input
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basic_ostream::put
basic_ostream::write
Posizionamento
Original:
Positioning
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basic_ostream::tellp
basic_ostream::seekp
Varie
Original:
Miscellaneous
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basic_ostream::flush
basic_ostream::swap(C++11)
Membri classi
Original:
Member classes
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basic_ostream::sentry
Non membri funzioni
Original:
Non-member functions
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operator<<(std::basic_ostream)
 
basic_ostream& operator<<( short value );
basic_ostream& operator<<( unsigned short value );
 (1)
basic_ostream& operator<<( int value );
basic_ostream& operator<<( unsigned int value );
 (2)
basic_ostream& operator<<( long value );
basic_ostream& operator<<( unsigned long value );
 (3)
basic_ostream& operator<<( long long value );
basic_ostream& operator<<( unsigned long long value );
 (4) (dal C++11)
basic_ostream& operator<<( float value );

basic_ostream& operator<<( double value );

basic_ostream& operator<<( long double value );
 (5)
basic_ostream& operator<<( bool value );
 (6)
basic_ostream& operator<<( const void* value );
 (7)
basic_ostream& operator<<( std::basic_streambuf<CharT, Traits>* sb);
 (8)
basic_ostream& operator<<( basic_ostream& st,

                           std::ios_base& (*func)(std::ios_base&) );
basic_ostream& operator<<( basic_ostream& st,
                           std::basic_ios<CharT,Traits>& (*func)(std::basic_ios<CharT,Traits>&) );
basic_ostream& operator<<( basic_ostream& st,

                           std::basic_ostream& (*func)(std::basic_ostream&) );
 (9)
Inserisce i dati nel flusso.
Original:
Inserts data into the stream.
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Le (1-7) versioni del gestore si comportano come funzioni di output formattato, e la 8) versione si comporta funzione di output non formattato. Queste funzioni avviare l'esecuzione con la costruzione di un oggetto di tipo sentry, che svuota il buffer di uscita tie()'d, se necessario, e controlla gli errori del flusso. Dopo la costruzione, se i rendimenti sentinella oggetto false, le funzioni restituiscono senza tentare alcun output. Se si verifica un errore durante l'uscita, le funzioni di uscita in formato impostato setstate(ios_base::failbit). Se viene generata un'eccezione durante l'uscita, poi ios :: badbit è impostato (l'eccezione è soppressa a meno (exceptions()&badbit) != 0, nel qual caso viene rilanciata)
Original:
The (1-7) versions of the operator behave as formatted output functions, and the 8) version behaves as unformatted output function. These functions begin execution by constructing an object of type sentry, which flushes the tie()'d output buffers if necessary and checks the stream errors. After construction, if the sentry object returns false, the functions return without attempting any output. If an error occurs during output, formatted output functions set setstate(ios_base::failbit). If an exception is thrown during output, then ios::badbit is set (the exception is suppressed unless (exceptions()&badbit) != 0, in which case it is rethrown)
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1-2)
Se value è short o int, poi getta a unsigned short o unsigned int se ios_base::flags() & ios_base::basefield è ios_base::oct o ios_base::hex. Dopo di che, getta a long in ogni caso e uscite come in 3). Se value è unsigned short o unsigned int, getta a unsigned long e uscite come in 3)
Original:
If value is short or int, then casts it to unsigned short or unsigned int if ios_base::flags() & ios_base::basefield is ios_base::oct or ios_base::hex. After that, casts to long in any case and outputs as in 3). If value is unsigned short or unsigned int, casts to unsigned long and outputs as in 3)
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3-4)
Inserisce un valore intero chiamando num_put::put(). Se la condizione di fine file è stato rilevato durante l'uscita (put().failed() == true), stabilisce ios::badbit.
Original:
Inserts an integer value by calling num_put::put(). If the end of file condition was encountered during output (put().failed() == true), sets ios::badbit.
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5)
Inserisce un valore in virgola mobile chiamando num_put::put() Se la condizione di fine file è stato rilevato durante l'uscita (put().failed() == true), imposta ios::badbit.
Original:
Inserts a floating point value by calling num_put::put() If the end of file condition was encountered during output (put().failed() == true), sets ios::badbit.
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6)
Inserti bool valore chiamando num_put::put() Se la condizione di fine file è stato rilevato durante l'uscita (put().failed() == true), imposta ios::badbit.
Original:
Inserts bool value by calling num_put::put() If the end of file condition was encountered during output (put().failed() == true), sets ios::badbit.
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7)
Inserisce un valore puntatore generico chiamando num_put::put() Se la condizione di fine file è stato rilevato durante l'uscita (put().failed() == true), imposta ios::badbit.
Original:
Inserts a generic pointer value by calling num_put::put() If the end of file condition was encountered during output (put().failed() == true), sets ios::badbit.
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8)
Inserisce tutti i dati dal sb. Dopo la creazione dell'oggetto di sentinella, controlla se sb è un puntatore nullo. Se lo è, esegue setstate(badbit) ed esce. In caso contrario, estrae i caratteri dalla sequenza di input controllato da sb e le inserisce in *this fino a quando una delle seguenti condizioni sono soddisfatte:
Original:
Inserts all data from sb. After constructing the sentry object, checks if sb is a null pointer. If it is, executes setstate(badbit) and exits. Otherwise, extracts characters from the input sequence controlled by sb and inserts them into *this until one of the following conditions are met:
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  • end-of-file avviene sulla sequenza di input;
    Original:
    end-of-file occurs on the input sequence;
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  • inserire nella sequenza di uscita fallisce (nel qual caso il carattere da inserire non viene estratto)
    Original:
    inserting in the output sequence fails (in which case the character to be inserted is not extracted);
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  • si verifica un'eccezione (in questo caso l'eccezione e 'colto).
    Original:
    an exception occurs (in which case the exception is caught).
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Se non sono stati inseriti caratteri, esegue setstate(badbit). Se viene generata un'eccezione durante l'estrazione, imposta failbit
Original:
If no characters were inserted, executes setstate(badbit). If an exception was thrown while extracting, sets failbit
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9)
Chiamate func(*this);. Questo sovraccarico è utilizzato per implementare uscita I / O manipolatori come std::endl.
Original:
Calls func(*this);. This overload is used to implement output I/O manipulators such as std::endl.
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Indice

[modifica] Parametri

value -
intero, a virgola mobile, valore booleano, o puntatore da inserire
Original:
integer, floating-point, boolean, or pointer value to insert
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func -
funzione da chiamare
Original:
function to call
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sb -
puntatore alla streambuffer a leggere i dati
Original:
pointer to the streambuffer to read the data from
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[modifica] Valore di ritorno

*this

[modifica] Note

Non ci sono il sovraccarico per i puntatori a puntatori volatili o di una funzione (diversi da quelli con le firme accettate 9) sovraccarico). Il tentativo di produrre tali oggetti invoca conversione implicita a bool, e, per ogni valore non nullo del puntatore, il 1 valore viene stampato (a meno che non boolalpha è stato impostato).
Original:
There are no overload for pointers to volatile or function pointers (other than the ones with signatures accepted by the 9) overload). Attempting to output such objects invokes implicit conversion to bool, and, for any non-null pointer value, the value 1 is printed (unless boolalpha was set).
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[modifica] Esempio

#include <iostream>
#include <iomanip>
#include <sstream>
int main()
{
    std::istringstream input(" \"Some text.\" ");
    volatile int n = 42;
    double f = 3.14;
    bool b = true;;
    std::cout << n   // int overload
              << ' ' // non-member overload
              << std::boolalpha << b // bool overload
              << " " // non-member overload
              << std::fixed << f // double overload
              << input.rdbuf() // streambuf overload
              << &n // bool overload
              << std::endl; // function overload
}

Output: 

42 true 3.140000 "Some text." true

[modifica] Vedi anche
inserisce i dati carattere
Original:
inserts character data
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(funzione) [modifica]
esegue lo streaming di I / O di stringhe
Original:
performs stream I/O of strings
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(funzione di modello)
esegue flusso di input e output di bitset
Original:
performs stream input and output of bitsets
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(funzione)
serializza e deserializza un numero complesso
Original:
serializes and deserializes a complex number
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(funzione di modello)
esegue flusso di ingresso e di uscita sul pseudo-casuale numero di motore
Original:
performs stream input and output on pseudo-random number engine
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(funzione) [modifica]
esegue flusso di ingresso e di uscita sul pseudo-casuale distribuzione numerica
Original:
performs stream input and output on pseudo-random number distribution
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(funzione) [modifica]
inserisce un carattere
Original:
inserts a character
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(metodo pubblico) [modifica]
blocchi inserti di caratteri
Original:
inserts blocks of characters
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(metodo pubblico) [modifica]
Estratto da "https://it.cppreference.com/mwiki/index.php?title=cpp/io/basic_ostream/operator_ltlt&oldid=25707"