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std::cout, std::wcout

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< cpp‎ | io

 
 
D'entrée / sortie de bibliothèque
I / O manipulateurs
C-style I / O
Tampons
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf (obsolète)
Cours d'eau
Original:
Streams
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Abstractions
Original:
Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
Fichier E / O
Original:
File I/O
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basic_ifstream
basic_ofstream
basic_fstream
Chaîne I / O
Original:
String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Tableau I / O
Original:
Array I/O
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istrstream (obsolète)
ostrstream (obsolète)
strstream (obsolète)
Types
Original:
Types
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streamoff
streamsize
fpos
Interface catégorie d'erreur
Original:
Error category interface
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iostream_category (C++11)
io_errc (C++11)
 
std::basic_ostream
Les objets globaux
Original:
Global objects
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cout
wcout
Les fonctions membres
Original:
Member functions
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basic_ostream::basic_ostream
basic_ostream::~basic_ostream
basic_ostream::operator= (C++11)
Entrée formaté
Original:
Formatted input
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basic_ostream::operator<<
Entrée non formaté
Original:
Unformatted input
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basic_ostream::put
basic_ostream::write
Positionnement
Original:
Positioning
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basic_ostream::tellp
basic_ostream::seekp
Divers
Original:
Miscellaneous
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basic_ostream::flush
basic_ostream::swap (C++11)
Classes de membres
Original:
Member classes
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basic_ostream::sentry
Tiers fonctions
Original:
Non-member functions
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operator<<(std::basic_ostream)
 
Defined in header <iostream>
extern std::ostream cout;
(1)
extern std::wostream wcout;
(2)
Les objets globaux std::cout et de sortie de commande std::wcout à une mémoire tampon de flux de type défini par l'application (extraite de std::streambuf), associé au flux de sortie standard C stdout .
Original:
The global objects std::cout and std::wcout control output to a stream buffer of implementation-defined type (derived from std::streambuf), associated with the standard C output stream stdout.
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Ces objets sont garantis d'être construits avant le premier constructeur d'un objet statique est appelé et ils sont garantis pour survivre à la dernière destructeur d'un objet statique, de sorte qu'il est toujours possible d'écrire à std::cout dans le code utilisateur .
Original:
These objects are guaranteed to be constructed before the first constructor of a static object is called and they are guaranteed to outlive the last destructor of a static object, so that it is always possible to write to std::cout in user code.
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Sauf sync_with_stdio(false) a été délivré, il est sûr d'accéder simultanément à ces objets à partir de plusieurs threads à la fois pour une sortie formatée et non formaté .
Original:
Unless sync_with_stdio(false) has been issued, it is safe to concurrently access these objects from multiple threads for both formatted and unformatted output.
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Une fois initialisé, std::cout est tie () 'd pour std::cin et std::wcout est tie ()' d pour std::wcin, ce qui signifie que toute opération d'entrée sur std::cin exécute std::cout.flush() (via un constructeur de std::basic_istream::sentry) .
Original:
Once initialized, std::cout is tie()'d to std::cin and std::wcout is tie()'d to std::wcin, meaning that any input operation on std::cin executes std::cout.flush() (via std::basic_istream::sentry's constructor).
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Une fois initialisé, std::cout est également attacher () 'd pour std::cerr et std::wcout est tie ()' d pour std::wcerr, ce qui signifie que toute opération de sortie sur std::cerr exécute std::cout.flush() (via un constructeur de std::basic_ostream::sentry) (depuis C++11)
Original:
Once initialized, std::cout is also tie()'d to std::cerr and std::wcout is tie()'d to std::wcerr,, meaning that any output operation on std::cerr executes std::cout.flush() (via std::basic_ostream::sentry's constructor) (depuis C++11)
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[modifier] Exemple

#include <iostream>
struct Foo {
    int n;
    Foo() {
       std::cout << "static constructor\n";
    }
    ~Foo() {
       std::cout << "static destructor\n";
    }
};
Foo f; // static object
int main()
{
    std::cout << "main function\n";
}

Résultat :

static constructor
main function
static destructor

[modifier] Voir aussi

initialise les objets de flux standard
Original:
initializes standard stream objects
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(classe membre publique de std::ios_base) [edit]
écrit à la norme C stderr
(
objet global
Original:
global object
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)
flux d'erreur
Original:
writes to the standard C error stream stderr
(
objet global
Original:
global object
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)
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[edit]
cout
wcout
écrit à la norme C stdout
(
objet global
Original:
global object
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)
flux de sortie
Original:
writes to the standard C output stream stdout
(
objet global
Original:
global object
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)
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[edit]