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operator<<<div class="t-tr-text">(Std :: basic_ostream)<div class="t-tr-dropdown"><div><div><div class="t-tr-dropdown-arrow-border"></div><div class="t-tr-dropdown-arrow"></div><div class="t-tr-dropdown-h">Original:</div><div class="t-tr-dropdown-orig">(std::basic_ostream)</div><div class="t-tr-dropdown-notes">The text has been machine-translated via [http://translate.google.com Google Translate].<br/> You can help to correct and verify the translation. Click [http://en.cppreference.com/w/Cppreference:MachineTranslations here] for instructions.</div></div></div></div></div>

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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)
 
template< class CharT, class Traits>

basic_ostream<CharT,Traits>& operator<<( basic_ostream<CharT,Traits>& os,
                                         CharT ch );
template< class CharT, class Traits>
basic_ostream<CharT,Traits>& operator<<( basic_ostream<CharT,Traits>& os,
                                         char ch );
template< class Traits >
basic_ostream<char,Traits>& operator<<( basic_ostream<char,Traits>& os,
                                        char ch );
template< class Traits >
basic_ostream<char,Traits>& operator<<( basic_ostream<char,Traits>& os,
                                        signed char ch );
template< class Traits >
basic_ostream<char,Traits>& operator<<( basic_ostream<char,Traits>& os,

                                        unsigned char ch );
 (1)
template< class CharT, class Traits >

basic_ostream<CharT,Traits>& operator<<( basic_ostream<CharT,Traits>& os,
                                         const CharT* s );
template< class CharT, class Traits >
basic_ostream<CharT,Traits>& operator<<( basic_ostream<CharT,Traits>& os,
                                         const char* s );
template< class Traits >
basic_ostream<char,Traits>& operator<<( basic_ostream<char,Traits>& os,  
                                        const char* s );
template< class Traits >
basic_ostream<char,Traits>& operator<<( basic_ostream<char,Traits>& os,
                                        const signed char* s );
template< class Traits >
basic_ostream<char,Traits>& operator<<( basic_ostream<char,traits>& os,

                                        const unsigned char* s );
 (2)
template< class CharT, class Traits, class T >

basic_ostream< charT, traits >& operator<<( basic_ostream<CharT,Traits>&& os,

                                            const T& value );
 (3) (dal C++11)
Inserisce un carattere o una stringa di caratteri.
Original:
Inserts a character or a character string.
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1-2)
sono formattati funzioni di uscita: si comincia 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, queste funzioni restituiscono senza tentare alcun output. Se si verifica un errore durante l'uscita, queste funzioni setstate(ios_base::failbit) chiamare. 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:
are formatted output functions: they 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, these functions return without attempting any output. If an error occurs during output, these functions call 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)
Inserisce un carattere ch. Se il tipo di carattere non è CharT, viene prima convertito con os.widen(ch). Riempimento è determinato come per la fase 3 di num_put::put(). Dopo l'inserimento, width(0) è chiamato.
Original:
Inserts a character ch. If the type of the character is not CharT, it is first converted with os.widen(ch). Padding is determined as if by Stage 3 of num_put::put(). After insertion, width(0) is called.
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2)
Inserisce caratteri successivi dalla matrice di caratteri il cui primo elemento è puntato da s.
Original:
Inserts successive characters from the character array whose first element is pointed to by s.
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  • per i sovraccarichi primo e il terzo (dove CharT corrisponda al tipo di ch), esattamente traits::length(s) caratteri vengono inseriti.
    Original:
    for the first and third overloads (where CharT matches the type of ch), exactly traits::length(s) characters are inserted.
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  • per il secondo overload, esattamente std::char_traits<char>::length(s) caratteri vengono inseriti.
    Original:
    for the second overload, exactly std::char_traits<char>::length(s) characters are inserted.
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  • per gli ultimi due overload, esattamente traits::length(reinterpret_cast<const char*>(s)) sono inseriti.
    Original:
    for the last two overloads, exactly traits::length(reinterpret_cast<const char*>(s)) are inserted.
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Riempimento è determinato come per la fase 3 di num_put::put(). Tutti i personaggi sono allargati con os.widen() prima dell'inserimento. Dopo l'inserimento, width(0) è chiamato.
Original:
Padding is determined as if by Stage 3 of num_put::put(). All characters are widened using os.widen() before insertion. After insertion, width(0) is called.
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3)
Chiama l'operatore di inserimento appropriato, dato un riferimento a un oggetto rvalue flusso di uscita (equivalente a os << value).
Original:
Calls the appropriate insertion operator, given an rvalue reference to an output stream object (equivalent to os << value).
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Indice

[modifica] Parametri

os -
uscita del flusso di inserire i dati
Original:
output stream to insert data to
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ch -
riferimento a un carattere da inserire
Original:
reference to a character to insert
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s -
puntatore a una stringa di caratteri da inserire
Original:
pointer to a character string to insert
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[modifica] Valore di ritorno

st

[modifica] Esempio

#include <iostream>
#include <sstream>
int main()
{
    std::cout << "Hello, world" // the const char* overlaod
              << '\n';          // the char overload
    std::string s = (std::ostringstream() << 1.2).str(); // rvalue overload
    std::cout << s << '\n';
}

Output: 

Hello, world
1.2

[modifica] Vedi anche
inserisce i dati formattati
Original:
inserts formatted data
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(metodo pubblico) [modifica]
Estratto da "https://it.cppreference.com/mwiki/index.php?title=cpp/io/basic_ostream/operator_ltlt2&oldid=25708"