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std::ws

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< cpp‎ | io‎ | manip

 
 
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
Original:
Error category interface
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iostream_category (C++11)
io_errc (C++11)
 
D'entrée / sortie manipulateurs
À virgule flottante en forme
Original:
Floating-point formatting
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Formatage entier
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Integer formatting
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Formatage booléen
Original:
Boolean formatting
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boolalpha
noboolalpha
Largeur de champ et de contrôle de remplissage
Original:
Field width and fill control
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Autre mise en forme
Original:
Other formatting
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Traitement des espaces blancs
Original:
Whitespace processing
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ws
ends
Sortie de rinçage
Original:
Output flushing
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Indicateurs d'état manipulation
Original:
Status flags manipulation
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Temps et d'argent I / O
Original:
Time and money I/O
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get_money (C++11)
get_time (C++11)
put_money (C++11)
put_time (C++11)
 
Defined in header <istream>
template< class CharT, class Traits >
std::basic_istream<CharT,Traits>& ws( std::basic_istream<CharT, Traits>& is );
Les rejets les espaces au début d'un flux d'entrée .
Original:
Discards leading whitespace from an input stream.
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Se comporte comme un UnformattedInputFunction, sauf que is.gcount() n'est pas modifié. Après la construction et la vérification de l'objet sentinelle, extrait les caractères à partir du flux et les supprime jusqu'à l'une des conditions suivantes est remplie:
Original:
Behaves as an UnformattedInputFunction, except that is.gcount() is not modified. After constructing and checking the sentry object, extracts characters from the stream and discards them until any one of the following conditions occurs:
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  • condition de fin de fichier se produit dans la séquence d'entrée (dans ce cas, la fonction appelle setstate(eofbit) mais ne définit pas failbit .
    Original:
    end of file condition occurs in the input sequence (in which case the function calls setstate(eofbit) but does not set failbit.
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  • l'c caractère suivant disponible dans la séquence d'entrée n'est pas déterminé par des espaces, comme std::isspace(c, is.getloc()). Le caractère non-blanc n'est pas extraite .
    Original:
    the next available character c in the input sequence is not whitespace as determined by std::isspace(c, is.getloc()). The non-whitespace character is not extracted.
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Il s'agit d'un manipulateur d'entrée uniquement d'E / S, il peut être appelé avec une expression telle que pour tout in << std::ws in de type std::basic_istream .
Original:
This is an input-only I/O manipulator, it may be called with an expression such as in << std::ws for any in of type std::basic_istream.
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Sommaire

[modifier] Paramètres

is -
référence aux flux d'entrée
Original:
reference to input stream
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[modifier] Retourne la valeur

is (référence au flux après l'extraction des espaces consécutifs)
Original:
is (reference to the stream after extraction of consecutive whitespace)
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[modifier] Exemple

#include <iostream>
#include <sstream>
int main()
{
    std::istringstream s("     this is a test");
    std::string line;
    s >> std::ws;
    getline(s, line);
    std::cout << "ws + getline returns: \"" << line << "\"\n";
}

Résultat :

ws + getline returns: "this is a test"

[modifier] Voir aussi

extraits et des personnages rejets jusqu'à ce que le caractère donné se trouve
Original:
extracts and discards characters until the given character is found
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(fonction membre publique de std::basic_istream) [edit]