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std::setw

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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
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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)
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Types
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streamoff
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Error category interface
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iostream_category(C++11)
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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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setfill
setw
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 <iomanip>
/*unspecified*/ setw( int n );
Quando utilizado numa expressão out << setw(n) ou in >> setw(n), define o parâmetro do fluxo de width out ou in exactamente n. Este valor não é "pegajoso": a próxima entrada ou operação de saída que é afetado pelo valor do campo do fluxo width, repõe a zero (ou seja, "não especificado").
Original:
When used in an expression out << setw(n) or in >> setw(n), sets the width parameter of the stream out or in to exactly n. This value is not "sticky": the next input or output operation that is affected by the value of the stream's width field, resets it to zero (meaning "unspecified").
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Índice

[editar] Parâmetros

n -
novo valor para a largura
Original:
new value for width
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[editar] Valor de retorno

Devolve um objecto de tipo não especificado de tal forma que se str é o nome de um fluxo de saída de tipo std::basic_ostream<CharT, Traits> ou std::basic_istream<CharT, Traits>, então a expressão str << setw(n) str >> setw(n) ou se comporta como se o seguinte código foi executado:
Original:
Returns an object of unspecified type such that if str is the name of an output stream of type std::basic_ostream<CharT, Traits> or std::basic_istream<CharT, Traits>, then the expression str << setw(n) or str >> setw(n) behaves as if the following code was executed:
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str.width(n);

[editar] Exemplo

#include <sstream>
#include <iostream>
#include <iomanip>
int main()
{
        std::cout << "no setw: " << 42 << '\n'
                  << "setw(6): " << std::setw(6) << 42 << '\n';
        std::istringstream is("hello, world");
        char arr[10];
        is >> std::setw(6) >> arr;
        std::cout << "Input from \"" << is.str() << "\" with setw(6) gave \"" << arr << "\"\n";
}

Output:

no setw: 42
setw(6):     42
Input from "hello, world" with setw(6) gave "hello"

[editar] Veja também

manages field width
(of std::ios_base função pública membro) [edit]
muda o caráter de preenchimento
Original:
changes the fill character
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(modelo de função) [edit]