std::getline

 

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)

 

Defined in header <string>
template< class CharT, class Traits, class Allocator > std::basic_istream<CharT,Traits>& getline( std::basic_istream<CharT,Traits>& input,                                            std::basic_string<CharT,Traits,Allocator>& str,                                            CharT delim );	(1)
template< class CharT, class Traits, class Allocator > std::basic_istream<CharT,Traits>& getline( std::basic_istream<CharT,Traits>&& input,                                            std::basic_string<CharT,Traits,Allocator>& str,                                            CharT delim );	(1)	(dal C++11)
template< class CharT, class Traits, class Allocator > std::basic_istream<CharT,Traits>& getline( std::basic_istream<CharT,Traits>& input,                                            std::basic_string<CharT,Traits,Allocator>& str );	(2)
template< class CharT, class Traits, class Allocator > std::basic_istream<CharT,Traits>& getline( std::basic_istream<CharT,Traits>&& input,                                            std::basic_string<CharT,Traits,Allocator>& str );	(2)	(dal C++11)

getline legge i caratteri da un flusso di input e li colloca in una stringa:

Original:

getline reads characters from an input stream and places them into a string:

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1)

Si comporta come UnformattedInputFunction, salvo che input.gcount() non è interessato. Dopo la costruzione e la verifica dell'oggetto sentinella, esegue le seguenti operazioni:

Original:

Behaves as UnformattedInputFunction, except that input.gcount() is not affected. After constructing and checking the sentry object, performs the following:

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1)

Chiamate str.erase()

Original:

Calls str.erase()

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2)

Estrae personaggi input e li aggiunge al str fino a quando uno dei seguenti casi (controllate nell'ordine elencato)

Original:

Extracts characters from input and appends them to str until one of the following occurs (checked in the order listed)

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a)

end-of-file sul input condizione, in questo caso, getline set eofbit e ritorna.

Original:

end-of-file condition on input, in which case, getline sets eofbit and returns.

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b)

il carattere successivo ingresso disponibile è delim, come testato da Traits::eq(c, delim), nel qual caso viene estratto il carattere delimitatore da input, ma non è aggiunto al str.

Original:

the next available input character is delim, as tested by Traits::eq(c, delim), in which case the delimiter character is extracted from input, but is not appended to str.

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c)

Caratteri str.max_size() sono stati memorizzati, in questo caso, getline set failbit e ritorna.

Original:

str.max_size() characters have been stored, in which case getline sets failbit and returns.

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3)

Se nessun carattere sono stati estratti per qualsiasi motivo (nemmeno il delimitatore scartato), getline set failbit e ritorna.

Original:

If no characters were extracted for whatever reason (not even the discarded delimiter), getline sets failbit and returns.

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2)

Stessa getline(input, str, input.widen(’\n’)), cioè, il default è il carattere delimitatore linea di fondo.

Original:

Same as getline(input, str, input.widen(’\n’)), that is, the default delimiter is the endline character.

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Parametri

input	-	il flusso per ottenere i dati Original: the stream to get data from 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 di mettere i dati in Original: the string to put the data into The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
delim	-	il carattere delimitatore Original: the delimiter character 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

input

Esempio

Il codice seguente chiede all'utente per il loro nome, poi li saluta con quel nome .

Original:

The following code asks the user for their name, then greets them using that name.

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#include <string>
#include <iostream>
 
int main()
{
    std::string name;
    std::cout << "What is your name? ";
    std::getline(std::cin, name);
    std::cout << "Hello " << name << ", nice to meet you.";
}

Possible output:

What is your name? John Q. Public
Hello John Q. Public, nice to meet you.