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std::setbase

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Buffers
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basic_streambuf
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strstreambuf(obsoleta)
Streams
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Streams
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ios_base
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File I/O
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Entrada / saída manipuladores
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Floating-point formatting
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Formatação inteiro
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Integer formatting
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Boolean formatting
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boolalpha
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Other formatting
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Time and money I/O
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get_money(C++11)
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Defined in header <iomanip>
/*unspecified*/ setbase( int base );
Quando utilizado numa expressão out << setbase(base) ou in >> setbase(base), altera o sinalizador basefield do fluxo out in ou, dependendo do valor de base: o valor 16 conjuntos basefield para std::ios_base::hex, o valor de 8 conjuntos std::ios_base::oct, o valor de 10 conjuntos std::ios_base::dec.
Original:
When used in an expression out << setbase(base) or in >> setbase(base), changes the basefield flag of the stream out or in, depending on the value of base: the value 16 sets basefield to std::ios_base::hex, the value 8 sets std::ios_base::oct, the value 10 sets std::ios_base::dec.
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Valores de base outro de 8, 10, ou 16 basefield reposto a zero, o que corresponde a saída decimal e prefixo-dependente de entrada.
Original:
Values of base other than 8, 10, or 16 reset basefield to zero, which corresponds to decimal output and prefix-dependent input.
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Índice

[editar] Parâmetros

base -
novo valor para basefield
Original:
new value for basefield
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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 << setbase(base) str >> setbase(base) 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 << setbase(base) or str >> setbase(base) behaves as if the following code was executed:
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str.setf(base ==  8 ? std::ios_base::oct :
            base == 10 ? std::ios_base::dec :
                base == 16 ? std::ios_base::hex :
                     std::ios_base::fmtflags(0),
         std::ios_base::basefield);

[editar] Exemplo

#include <iostream>
#include <sstream>
#include <iomanip>
int main()
{
    std::cout << "Parsing string \"10 0x10 010\"\n";
 
    int n1, n2, n3;
    std::istringstream s("10 0x10 010");
    s >> std::setbase(16) >> n1 >> n2 >> n3;
    std::cout << "hexadecimal parse: " << n1 << ' ' << n2 << ' ' << n3 << '\n';
 
    s.clear();
    s.seekg(0);
    s >> std::setbase(0) >> n1 >> n2 >> n3;
    std::cout << "prefix-dependent parse: " << n1 << ' ' << n2 << ' ' << n3 << '\n';
 
    std::cout << "hex output: " << std::setbase(16)
              << std::showbase << n1 << ' ' << n2 << ' ' << n3 << '\n';
}

Output:

Parsing string "10 0x10 010"
hexadecimal parse: 16 16 16
prefix-dependent parse: 10 16 8
hex output: 0xa 0x10 0x8

[editar] Veja também

muda a base utilizada para o inteiro I / O
Original:
changes the base used for integer I/O
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(função) [edit]
controla se o prefixo é usado para indicar base numérica
Original:
controls whether prefix is used to indicate numeric base
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(função) [edit]