Espaços nominais
Variantes
Acções

std::showbase, std::noshowbase

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< cpp‎ | io‎ | manip

 
 
De entrada / saída da biblioteca
I / O manipuladores
C estilo de I / O
Buffers
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(obsoleta)
Streams
Original:
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
Original:
String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Matriz de I / O
Original:
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
Original:
Floating-point formatting
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Formatação inteiro
Original:
Integer formatting
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setbase
showbase
noshowbase
Formatação booleana
Original:
Boolean formatting
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boolalpha
noboolalpha
Largura do campo e controle de preenchimento
Original:
Field width and fill control
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Outra formatação
Original:
Other formatting
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Espaços de processamento
Original:
Whitespace processing
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Saída de descarga
Original:
Output flushing
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Sinalizadores de status manipulação
Original:
Status flags manipulation
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Tempo e dinheiro 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& showbase( std::ios_base& str );
(1)
std::ios_base& noshowbase( std::ios_base& str );
(2)
1)
permite a bandeira showbase no str fluxo, como se chamando str.setf(std::ios_base::showbase)
Original:
enables the showbase flag in the stream str as if by calling str.setf(std::ios_base::showbase)
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2)
desabilita a bandeira showbase no str fluxo, como se chamando str.unsetf(std::ios_base::showbase)
Original:
disables the showbase flag in the stream str as if by calling str.unsetf(std::ios_base::showbase)
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Trata-se de um manipulador de I / O, que pode ser chamada com uma indicação tal como para qualquer out << std::showbase out de std::basic_ostream tipo ou com uma indicação tal como para qualquer in >> std::showbase in de std::basic_istream tipo.
Original:
This is an I/O manipulator, it may be called with an expression such as out << std::showbase for any out of type std::basic_ostream or with an expression such as in >> std::showbase 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>
#include <iomanip>
int main()
{
    // showbase affects the output of octals and hexadecimals
    std::cout << std::hex
              << "showbase: " << std::showbase << 42 << '\n'
              << "noshowbase: " << std::noshowbase << 42 << '\n';
 
    // and both input and output of monetary values
    std::locale::global(std::locale("en_US.utf8"));
    long double val = 0;
    std::istringstream is("3.14");
    is >> std::showbase >> std::get_money(val);
    std::cout << "With showbase, parsing 3.14 as money gives " << val << '\n';
    is.seekg(0);
    is >> std::noshowbase >> std::get_money(val);
    std::cout << "Without showbase, parsing 3.14 as money gives " << val << '\n';
}

Output:

showbase: 0x2a
noshowbase: 2a
With showbase, parsing 3.14 as money gives 0
Without showbase, parsing 3.14 as money gives 314

[editar] Veja também

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]