std::getline
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| Déclaré dans l'en-tête <string>
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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) | (depuis 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) | (depuis C++11) |
getline lit les caractères à partir d'un flux d'entrée et les place dans une chaîne:Original:
getline reads characters from an input stream and places them into a string:The text has been machine-translated via Google Translate.
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1)
Se comporte comme
UnformattedInputFunction, sauf que input.gcount() n'est pas affectée. Après la construction et la vérification de l'objet sentinelle, effectue les opérations suivantes:Original:
Behaves as
UnformattedInputFunction, except that input.gcount() is not affected. After constructing and checking the sentry object, performs the following:The text has been machine-translated via Google Translate.
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1)
Appels
str.erase()Original:
Calls
str.erase()The text has been machine-translated via Google Translate.
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2)
Extrait les caractères de
input et les ajoute à str jusqu'à ce qu'un des événements suivants se produit (vérifié dans l'ordre indiqué)Original:
Extracts characters from
input and appends them to str until one of the following occurs (checked in the order listed)The text has been machine-translated via Google Translate.
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a)
fin-de-fichier sur la situation
input, dans ce cas, getline ensembles eofbit et retours .Original:
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b)
le caractère d'entrée suivant est disponible
delim, telle que mesurée par Traits::eq(c, delim), dans ce cas, le caractère de délimitation est extrait de input, mais n'est pas ajouté à 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.The text has been machine-translated via Google Translate.
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c)
str.max_size() caractères ont été stockés, dans ce cas, getline ensembles failbit et retours .Original:
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3)
Si aucun caractère ont été extraites pour une raison quelconque (même pas jeté le délimiteur),
getline ensembles failbit et retours .Original:
If no characters were extracted for whatever reason (not even the discarded delimiter),
getline sets failbit and returns.The text has been machine-translated via Google Translate.
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2)
Même que
getline(input, str, input.widen(’\n’)), soit le délimiteur par défaut est le caractère fin de ligne .Original:
Same as
getline(input, str, input.widen(’\n’)), that is, the default delimiter is the endline character.The text has been machine-translated via Google Translate.
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Paramètres
| input | - | le flux pour obtenir les données
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 chaîne pour mettre les données
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 | - | le caractère délimiteur
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. |
Retourne la valeur
input
Exemple
Le code suivant demande à l'utilisateur son nom, puis les salue l'aide de ce nom .
Original:
The following code asks the user for their name, then greets them using that name.
The text has been machine-translated via Google Translate.
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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.";
// read file line by line
std::istringstream input;
input.str("1\n2\n3\n4\n5\n6\n7\n");
int sum = 0;
for (std::string line; std::getline(input, line); )
sum += std::stoi(line);
std::cout << "\nThe sum is " << sum << ".\n\n";
// use separator to read parts of the line
std::istringstream input2;
input2.str("a;b;c;d");
for (std::string line; std::getline(input2, line, ';'); )
std::cout << line << '\n';
return 0;
}
Résultat possible :
What is your name? John Q. Public
Hello John Q. Public, nice to meet you.
The sum is 28.
a
b
c
d