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std::getline

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< cpp‎ | string‎ | basic string

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C++
 
Bibliothèque de chaînes de caractères
Chaînes à zéro terminal
Original:
Null-terminated strings
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Les chaînes d'octets
Chaines multi-octets
Les chaînes étendues
Classes
Original:
Classes
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basic_string
char_traits
 
std::basic_string
Les fonctions membres
Original:
Member functions
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basic_string::basic_string
basic_string::operator=
basic_string::assign
basic_string::get_allocator
Elément d'accès
Original:
Element access
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basic_string::at
basic_string::operator[]
basic_string::front (C++11)
basic_string::back (C++11)
basic_string::data
basic_string::c_str
Les itérateurs
Original:
Iterators
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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)
Capacité
Original:
Capacity
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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)
Opérations
Original:
Operations
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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
Recherche
Original:
Search
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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
Constantes
Original:
Constants
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basic_string::npos
Tiers fonctions
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Non-member functions
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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)
Classes d'aide
Original:
Helper classes
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hash<std::string>
hash<std::wstring>
hash<std::u32string>
hash<std::u16string>		 (C++11)
 
Déclaré dans l'en-tête <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) (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:
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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:
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1)
Appels str.erase()
Original:
Calls str.erase()
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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)
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a)
fin-de-fichier sur la situation input, dans ce cas, getline ensembles eofbit et retours .
Original:
end-of-file condition on input, in which case, getline sets eofbit and returns.
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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.
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c)
str.max_size() caractères ont été stockés, dans ce cas, getline ensembles failbit et retours .
Original:
str.max_size() characters have been stored, in which case getline sets failbit and returns.
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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.
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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.
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[modifier] Paramètres

input -
le flux pour obtenir les données
Original:
the stream to get data from
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str -
la chaîne pour mettre les données
Original:
the string to put the data into
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delim -
le caractère délimiteur
Original:
the delimiter character
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[modifier] Retourne la valeur

input

[modifier] 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.
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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
Récupérée de « https://fr.cppreference.com/mwiki/index.php?title=cpp/string/basic_string/getline&oldid=50324 »