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std::basic_istream::sentry

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< cpp‎ | io‎ | basic istream

 
 
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
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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
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Error category interface
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iostream_category (C++11)
io_errc (C++11)
 
std::basic_istream
Les objets globaux
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Global objects
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cin
wcin
Les fonctions membres
Original:
Member functions
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basic_istream::basic_istream
basic_istream::~basic_istream
basic_istream::operator= (C++11)
Entrée formaté
Original:
Formatted input
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basic_istream::operator>>
Entrée non formaté
Original:
Unformatted input
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basic_istream::get
basic_istream::peek
basic_istream::unget
basic_istream::putback
basic_istream::getline
basic_istream::ignore
basic_istream::read
basic_istream::readsome
basic_istream::gcount
Positionnement
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Positioning
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basic_istream::tellg
basic_istream::seekg
Divers
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Miscellaneous
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basic_istream::sync
basic_istream::swap (C++11)
Classes de membres
Original:
Member classes
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basic_istream::sentry
Tiers fonctions
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Non-member functions
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operator>>(std::basic_istream)
 
basic_istream::sentry
Fonctions
Original:
Functions
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sentry::sentry
sentry::~sentry
sentry::operator bool
 
Defined in header <istream>
template< class CharT, class Traits = std::char_traits<CharT>>
class std::basic_istream<CharT, Traits>::sentry;

An object of class basic_istream::sentry is constructed in local scope at the beginning of each member function of std::basic_istream that performs input (both formatted and unformatted). Its constructor prepares the input stream: checks if the stream is already in a failed state, flushes the tie()'d output streams, skips leading whitespace if skipws flag is set, and performs other implementation-defined tasks if necessary. All cleanup, if necessary, is performed in the destructor, so that it is guaranteed to happen if exceptions are thrown during input.

Sommaire

[modifier] Types de membres

traits_type Traits

[modifier] Fonctions membres

construit la sentinelle object.
All les tâches de préparation ont fait ici
Original:
constructs the sentry object.
All the preparation tasks are done here
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(fonction membre publique) [edit]
finalizes the stream object after formatted input or after exception, if necessary
(fonction membre publique)
operator=
[
supprimée
Original:
deleted
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]
copiez pas cessible
Original:
not copy assignable
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(fonction membre publique)
vérifie si la préparation de l'objet de flux a été un succès
Original:
checks if the preparation of the stream object was successful
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(fonction membre publique) [edit]

[modifier] Exemple

#include <iostream>
#include <sstream>
 
struct Foo {
   char n[5];
};
std::istream& operator>>(std::istream& is, Foo& f)
{
    std::istream::sentry s(is);
    if(s)
        is.read(f.n, 5);
    return is;
}
 
int main()
{
    std::string input = "   abcde";
    std::istringstream stream(input);
    Foo f;
    stream >> f;
    std::cout.write(f.n, 5);
    std::cout << '\n';
}

Résultat :

abcde


[modifier] Voir aussi

extraits des données formatées
Original:
extracts formatted data
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(fonction membre publique) [edit]
extrait des tableaux de caractères et de caractères
Original:
extracts characters and character arrays
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(fonction générique) [edit]