std::operator<<,>>

<metanoindex/>

 

C++

Linguaggio

Concetti

Libreria di Utilità

Stringhe

Contenitori

Algoritmi

Iteratori

Libreria matematca

Input/output

Localizzazione

Espressioni regolari (C++11)

Operazioni atomicche (C++11)

Multithreading (C++11)

 

Stringhe libreria

Null-stringhe terminate Original: Null-terminated strings The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Byte stringhe

Multibyte stringhe

Stringhe larghe

Classi Original: Classes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_string

char_traits

 

std::basic_string

Membri funzioni Original: Member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_string::basic_string

basic_string::operator=

basic_string::assign

basic_string::get_allocator

Elemento accesso Original: Element access The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_string::at

basic_string::operator[]

basic_string::front (C++11)

basic_string::back (C++11)

basic_string::data

basic_string::c_str

Iteratori Original: Iterators The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_string::begin basic_string::cbegin (C++11)

basic_string::end basic_string::cend (C++11)

basic_string::rbegin basic_string::crbegin (C++11)

basic_string::rend basic_string::crend (C++11)

Capacità Original: Capacity The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_string::empty

basic_string::size

basic_string::length

basic_string::max_size

basic_string::reserve

basic_string::capacity

basic_string::shrink_to_fit (C++11)

Operazioni Original: Operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_string::clear

basic_string::insert

basic_string::erase

basic_string::push_back

basic_string::pop_back (C++11)

basic_string::append

basic_string::operator+=

basic_string::compare

basic_string::replace

basic_string::substr

basic_string::copy

basic_string::resize

basic_string::swap

Cerca Original: Search The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_string::find

basic_string::rfind

basic_string::find_first_of

basic_string::find_first_not_of

basic_string::find_last_of

basic_string::find_last_not_of

Costanti Original: Constants The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_string::npos

Non membri funzioni Original: Non-member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

operator+

operator== operator!= operator< operator> operator<= operator>=

swap(std::basic_string)

operator<< operator>>

getline

stoi stol stoll (C++11) (C++11) (C++11)

stoul stoull (C++11) (C++11)

stof stod stold (C++11) (C++11) (C++11)

to_string (C++11)

to_wstring (C++11)

Helper classi Original: Helper classes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

hash<std::string> hash<std::wstring> hash<std::u32string> hash<std::u16string> (C++11)

 

<tbody> </tbody>

Elemento definito nell'header <string>
template <class CharT, class Traits, class Allocator> std::basic_ostream<CharT, Traits>& operator<<(std::basic_ostream<CharT, Traits>& os, const std::basic_string<CharT, Traits, Allocator>& str);	(1)
template <class CharT, class Traits, class Allocator> std::basic_istream<CharT, Traits>& operator>>(std::basic_istream<CharT, Traits>& is, std::basic_string<CharT, Traits, Allocator>& str);	(2)

1)

In primo luogo, costruisce un oggetto std::basic_ostream::sentry, che svuota il legame () 'd flusso, se necessario, e verifica errori. Se l'oggetto sentinella restituisce false, esce immediatamente.

Original:

First, constructs a std::basic_ostream::sentry object, which flushes the tie()'d stream if necessary and checks for errors. If the sentry object returns false, exits immediately.

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Successivamente, se la sentinella oggetto true rendimenti, determina il formato di uscita imbottitura nella stessa maniera della fase 3 num_put::put().

Original:

Afterwards, if the sentry object returns true, determines the output format padding in the same manner as stage 3 of num_put::put().

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Poi memorizza ogni carattere della sequenza risultante (il contenuto di str più imbottitura) nel flusso di output os come se chiamando os.rdbuf()->sputn(seq, n), dove n=std::max(os.width(), str.size())

Original:

Then stores each character from the resulting sequence (the contents of str plus padding) to the output stream os as if by calling os.rdbuf()->sputn(seq, n), where n=std::max(os.width(), str.size())

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Infine, chiede os.width(0).

Original:

Finally, calls os.width(0).

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2)

In primo luogo, costruisce un oggetto std::basic_istream::sentry, che svuota il legame () 'd flusso se necessario, estratti ed elimina tutti i caratteri principali di spazio bianco a meno che la bandiera ios_base::skipws è stato cancellato, e controlli per gli errori. Se l'oggetto sentinella restituisce false, esce immediatamente.

Original:

First, constructs a std::basic_istream::sentry object, which flushes the tie()'d stream if necessary, extracts and discards all leading whitespace characters unless the ios_base::skipws flag was cleared, and checks for errors. If the sentry object returns false, exits immediately.

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In seguito, se i rendimenti sentinella oggetto true, cancella str con str.erase()

Original:

Afterwards, if the sentry object returns true, clears str with str.erase()

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Poi legge i caratteri da is e li aggiunge al str come per str.append(1, c), fino a quando una delle seguenti condizioni diventa vero:

Original:

Then reads characters from is and appends them to str as if by str.append(1, c), until one of the following conditions becomes true:

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• N caratteri vengono letti, dove N è is.width() se is.width() > 0, altrimenti N è str.max_size()

  Original:

  N characters are read, where N is is.width() if is.width() > 0, otherwise N is str.max_size()

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• la fine del file condizione si verifica nel is flusso

  Original:

  the end-of-file condition occurs in the stream is

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• std::isspace(c,is.getloc()) è vero per il carattere successivo c in is (questo carattere di spaziatura rimane nel flusso di input).

  Original:

  std::isspace(c,is.getloc()) is true for the next character c in is (this whitespace character remains in the input stream).

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Se nessun carattere vengono estratti poi std::ios::failbit è impostato su is, che possono gettare std::ios_base::failure.

Original:

If no characters are extracted then std::ios::failbit is set on is, which may throw std::ios_base::failure.

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Infine, chiama os.width(0) e distrugge l'oggetto std::basic_istream::sentry.

Original:

Finally, calls os.width(0) and destroys the std::basic_istream::sentry object.

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Eccezioni

1)

potrebbe generare std::ios_base::failure se viene generata un'eccezione durante l'output.

Original:

may throw std::ios_base::failure if an exception is thrown during output.

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2)

può gettare std::ios_base::failure se non i caratteri vengono estratti dal is (ad esempio, il flusso è alla fine del file, o è costituito da spazi bianchi solo), o se viene generata un'eccezione durante l'ingresso.

Original:

may throw std::ios_base::failure if no characters are extracted from is (e.g the stream is at end of file, or consists of whitespace only), or if an exception is thrown during input.

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Parametri

os	-	un flusso di output di caratteri Original: a character output stream The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
is	-	un flusso di immissione dei caratteri Original: a character input stream The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
str	-	la stringa da inserire o estrarre Original: the string to be inserted or extracted The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Valore di ritorno

1) os

2) is

Esempio

#include <iostream>
#include <string>

int main()
{
    std::string greeting = "Hello, whirled!"
    std::cout << greeting << '\n';
}

Output:

Hello, whirled!