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std::boolalpha, std::noboolalpha

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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
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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
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Other formatting
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Traitement des espaces blancs
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Whitespace processing
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Sortie de rinçage
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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 <ios>
std::ios_base& boolalpha( std::ios_base& str );
(1)
std::ios_base& noboolalpha( std::ios_base& str );
(2)
1)
permet le drapeau boolalpha dans le flux str comme si en appelant str.setf(std::ios_base::boolalpha)
Original:
enables the boolalpha flag in the stream str as if by calling str.setf(std::ios_base::boolalpha)
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2)
désactive le drapeau boolalpha dans le flux str comme si en appelant str.unsetf(std::ios_base::boolalpha)
Original:
disables the boolalpha flag in the stream str as if by calling str.unsetf(std::ios_base::boolalpha)
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std::boolalpha est un manipulateur d'E / S, de sorte qu'il peut être appelé avec une expression telle que pour tout out << std::boolalpha out de std::basic_ostream type ou d'une expression telle que pour tout in >> std::boolalpha in de type std::basic_istream .
Original:
std::boolalpha is an I/O manipulator, so it may be called with an expression such as out << std::boolalpha for any out of type std::basic_ostream or with an expression such as in >> std::boolalpha for any in of type std::basic_istream.
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Sommaire

[modifier] Paramètres

str -
référence aux flux d'entrée / sortie
Original:
reference to I/O stream
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[modifier] Retourne la valeur

str (référence au flux après la manipulation)
Original:
str (reference to the stream after manipulation)
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[modifier] Exemple

#include <sstream>
#include <locale>
#include <iostream>
int main()
{
    // boolalpha output
    std::cout << std::boolalpha 
              << "boolalpha true: " << true << '\n'
              << "boolalpha false: " << false << '\n';
    std::cout << std::noboolalpha 
              << "noboolalpha true: " << true << '\n'
              << "noboolalpha false: " << false << '\n';
    // booalpha parse
    bool b1, b2;
    std::istringstream is("true false");
    is >> std::boolalpha >> b1 >> b2;
    std::cout << '\"' << is.str() << "\" parsed as " << b1 << ' ' << b2 << '\n';
}

Résultat :

boolalpha true: true
boolalpha false: false
noboolalpha true: 1
noboolalpha false: 0
"true false" parsed as 1 0

[modifier] Voir aussi

Modèle:cpp/locale/numpunct/dsc do truenameModèle:cpp/locale/numpunct/dsc do falsename
efface les drapeaux ios_base spécifiées
Original:
clears the specified ios_base flags
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(fonction) [edit]
fixe les drapeaux ios_base spécifiées
Original:
sets the specified ios_base flags
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(fonction) [edit]