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std::operator<<,>>

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< cpp‎ | string‎ | basic string

 
 
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
Original:
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)
 
Defined in 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)
Tout d'abord, construit un objet std::basic_ostream::sentry, qui évacue la cravate () 'd flux si nécessaire et vérifie les erreurs. Si l'objet sentinelle retourne false, quitte immédiatement .
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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Ensuite, si l'objet true retours sentinelle, détermine le rembourrage format de sortie de la même manière que l'étape 3 de 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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Puis stocke chaque caractère de la séquence résultante (le contenu de str ainsi padding) pour le flux de sortie os comme si en appelant os.rdbuf()->sputn(seq, n), où 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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Enfin, les appels os.width(0) .
Original:
Finally, calls os.width(0).
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2)
Tout d'abord, construit un objet std::basic_istream::sentry, qui évacue la cravate () 'd flux si nécessaire, des extraits et des rejets tous les personnages principaux espaces blancs à moins que le drapeau ios_base::skipws a été défrichées, et vérifie les erreurs. Si l'objet sentinelle retourne false, quitte immédiatement .
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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Ensuite, si les rendements objet sentinelle true, efface str avec str.erase()
Original:
Afterwards, if the sentry object returns true, clears str with str.erase()
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Puis lit les caractères à partir de is et les ajoute à str comme par str.append(1, c), jusqu'à ce que l'une des conditions suivantes est remplie:
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 caractères sont lus, où N est is.width() si is.width() > 0, sinon N est 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 condition de fin de fichier se produit dans le courant de is
    Original:
    the end-of-file condition occurs in the stream is
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  • std::isspace(c,is.getloc()) est vrai pour le caractère suivant dans c is (ce caractère d'espacement reste dans le flux d'entrée) .
    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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Si aucun caractère n'est extraite puis std::ios::failbit est réglé sur is, ce qui peut jeter 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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Enfin, les appels os.width(0) et détruit l'objet std::basic_istream::sentry .
Original:
Finally, calls os.width(0) and destroys the std::basic_istream::sentry object.
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Sommaire

[modifier] Exceptions

1)
peut jeter std::ios_base::failure si une exception est levée lors de la sortie .
Original:
may throw std::ios_base::failure if an exception is thrown during output.
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2)
peut jeter std::ios_base::failure si aucun caractère sont extraites de is (par exemple, le flux est à la fin du fichier, ou est constitué d'espaces uniquement), ou si une exception est levée lors de l'entrée .
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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[modifier] Paramètres

os -
un flux de sortie de caractères
Original:
a character output stream
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is -
un flux d'entrée de caractères
Original:
a character input stream
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str -
la chaîne à insérer ou à extraire
Original:
the string to be inserted or extracted
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[modifier] Retourne la valeur

1) os

2) is

[modifier] Exemple

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

Résultat :

Hello, whirled!