std::operator<<,>>

<metanoindex/>

 

C++

Langage

Concepts

Bibliothèque d'utilitaires

Bibliothèque pour les chaînes de caractères

Bibliothèque de conteneurs

Bibliothèque d'algorithmes

Bibliothèque d'itérateurs

Bibliothèque pour le calcul numérique

Bibliothèque pour les entrées/sorties

Bibliothèque pour la régionalisation

Bibliothèque pour les expressions régulières (C++11)

Bibliothèque pour les opérations atomiques (C++11)

Bibliothèque pour les processus légers (threads) (C++11)

 

Bibliothèque de chaînes de caractères

Chaînes à zéro terminal 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.

Les chaînes d'octets

Chaines multi-octets

Les chaînes étendues

Classes 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

Les fonctions membres 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

Elément d'accès 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

Les itérateurs 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)

Capacité 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)

Opérations 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

Recherche 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

Constantes 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

Tiers fonctions 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)

Classes d'aide 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)

 

<tbody> </tbody>

Déclaré dans l'en-tête <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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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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Paramètres

os	-	un flux de sortie de caractères Original: a character output stream The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
is	-	un flux d'entrée de caractères Original: a character input stream 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 à insérer ou à extraire Original: the string to be inserted or extracted 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

1) os

2) is

Exemple

#include <iostream>
#include <string>

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

Résultat :

Hello, whirled!