Espaços nominais
Variantes
Acções

std::boolalpha, std::noboolalpha

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< cpp‎ | io‎ | manip

 
 
De entrada / saída da biblioteca
I / O manipuladores
C estilo de I / O
Buffers
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Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(obsoleta)
Streams
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Streams
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Abstrações
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Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
File I / O
Original:
File I/O
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basic_ifstream
basic_ofstream
basic_fstream
Cordas I / O
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String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Matriz de I / O
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Array I/O
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istrstream(obsoleta)
ostrstream(obsoleta)
strstream(obsoleta)
Tipos
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Types
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streamoff
streamsize
fpos
Interface de categoria de erro
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Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
Entrada / saída manipuladores
De ponto flutuante de formatação
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Floating-point formatting
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Formatação inteiro
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Integer formatting
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Formatação booleana
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Boolean formatting
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boolalpha
noboolalpha
Largura do campo e controle de preenchimento
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Field width and fill control
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Outra formatação
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Other formatting
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Espaços de processamento
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Whitespace processing
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Saída de descarga
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Output flushing
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Sinalizadores de status manipulação
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Status flags manipulation
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Tempo e dinheiro I / O
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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)
permite a bandeira boolalpha no str fluxo, como se chamando 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)
desabilita a bandeira boolalpha no str fluxo, como se chamando 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 é um manipulador de I / O, por isso pode ser chamado com uma expressão como out << std::boolalpha para qualquer out de std::basic_ostream tipo ou com uma expressão como in >> std::boolalpha para qualquer tipo de in 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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Índice

[editar] Parâmetros

str -
referência ao fluxo de E / S
Original:
reference to I/O stream
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[editar] Valor de retorno

str (referência ao fluxo após a manipulação)
Original:
str (reference to the stream after manipulation)
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[editar] Exemplo

#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';
}

Output:

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

[editar] Veja também

Predefinição:cpp/locale/numpunct/dsc do truenamePredefinição:cpp/locale/numpunct/dsc do falsename
limpa os sinalizadores ios_base especificados
Original:
clears the specified ios_base flags
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(função) [edit]
define os sinalizadores ios_base especificados
Original:
sets the specified ios_base flags
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(função) [edit]