std::getline - cppreference.com

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Elemento definito nell'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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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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Chiamate str.erase()

Original:

Calls str.erase()

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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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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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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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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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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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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.