std::boolalpha, std::noboolalpha

 

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)

 

D'entrée / sortie de bibliothèque

I / O manipulateurs

C-style I / O

Tampons Original: Buffers The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_streambuf

basic_filebuf

basic_stringbuf

strstreambuf (obsolète)

Cours d'eau Original: Streams The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Abstractions Original: Abstractions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

ios_base

basic_ios

basic_istream

basic_ostream

basic_iostream

Fichier E / O Original: File I/O The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_ifstream

basic_ofstream

basic_fstream

Chaîne I / O Original: String I/O The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_istringstream

basic_ostringstream

basic_stringstream

Tableau I / O Original: Array I/O The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

istrstream (obsolète)

ostrstream (obsolète)

strstream (obsolète)

Types Original: Types The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

streamoff

streamsize

fpos

Interface catégorie d'erreur Original: Error category interface The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

iostream_category (C++11)

io_errc (C++11)

 

D'entrée / sortie manipulateurs

À virgule flottante en forme Original: Floating-point formatting The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
showpoint noshowpoint setprecision	fixed scientific hexfloat defaultfloat (C++11) (C++11)
Formatage entier Original: Integer formatting The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
setbase showbase noshowbase	dec hex oct
Formatage booléen Original: Boolean formatting The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
boolalpha noboolalpha
Largeur de champ et de contrôle de remplissage Original: Field width and fill control The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
setfill setw	internal left right
Autre mise en forme Original: Other formatting The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
showpos noshowpos	uppercase nouppercase
Traitement des espaces blancs Original: Whitespace processing The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
ws ends	skipws noskipws
Sortie de rinçage Original: Output flushing The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
flush endl	unitbuf nounitbuf
Indicateurs d'état manipulation Original: Status flags manipulation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
resetiosflags	setiosflags
Temps et d'argent I / O Original: Time and money I/O The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
get_money (C++11) get_time (C++11)	put_money (C++11) put_time (C++11)

 

Défini dans l'entête <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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Paramètres

str

-

référence aux flux d'entrée / sortie Original: reference to I/O stream 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

str (référence au flux après la manipulation)

Original:

str (reference to the stream after manipulation)

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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

Voir aussi

resetiosflags	efface les drapeaux ios_base spécifiées Original: clears the specified ios_base flags The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction)
setiosflags	fixe les drapeaux ios_base spécifiées Original: sets the specified ios_base flags The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction)
do_truename [ virtuel Original: virtual The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. ]	fournit la chaîne de caractères à utiliser en tant que nom de la true booléen Original: provides the string to use as the name of the boolean true The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction membre virtuelle protégée de std::numpunct)
do_falsename [ virtuel Original: virtual The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. ]	fournit la chaîne de caractères à utiliser en tant que nom de la false booléen Original: provides the string to use as the name of the boolean false The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction membre virtuelle protégée de std::numpunct)