Namespace
Varianti

std::setbase

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< cpp‎ | io‎ | manip

 
 
Ingresso / libreria di output
I / O manipolatori
C-style I / O
Buffer
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(deprecato)
Streams
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Streams
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Astrazioni
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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
String I / O
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String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Array I / O
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Array I/O
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istrstream(deprecato)
ostrstream(deprecato)
strstream(deprecato)
Tipi
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Types
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streamoff
streamsize
fpos
Errore categoria interfaccia
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Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
Ingresso / uscita manipolatori
Virgola mobile formattazione
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Floating-point formatting
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Formattazione Integer
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Integer formatting
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Formattazione Boolean
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Boolean formatting
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boolalpha
noboolalpha
Larghezza del campo e il controllo di riempimento
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Field width and fill control
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Di formattazione
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Other formatting
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Elaborazione degli spazi vuoti
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Whitespace processing
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Uscita di lavaggio
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Output flushing
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Flag di stato manipolazione
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Status flags manipulation
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Tempo e denaro 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*/ setbase( int base );
Quando utilizzato in un'espressione out << setbase(base) o in >> setbase(base), cambia il flag basefield del flusso out in o, a seconda del valore della base: il valore 16 insiemi basefield al std::ios_base::hex, il valore 8 insiemi std::ios_base::oct, il valore 10 serie 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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Valori di base diverso da 8, 10, o 16 basefield azzeramento, che corrisponde all'uscita decimale e prefisso-dipendente ingresso.
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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Indice

[modifica] Parametri

base -
nuovo valore per basefield
Original:
new value for basefield
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[modifica] Valore di ritorno

Restituisce un oggetto di tipo non specificato tale che se str è il nome di un flusso di output di tipo std::basic_ostream<CharT, Traits> o std::basic_istream<CharT, Traits>, allora l'espressione str << setbase(base) str >> setbase(base) o si comporta come se il codice riportato di seguito è stato eseguito:
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);

[modifica] Esempio

#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

[modifica] Vedi anche

modifica la base utilizzata per intero di I / O
Original:
changes the base used for integer I/O
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(funzione) [edit]
controlla se il prefisso è usato per indicare base numerica
Original:
controls whether prefix is used to indicate numeric base
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(funzione) [edit]