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std::setbase

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< cpp‎ | io‎ | manip

 
 
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Puffern
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Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(veraltet)
Streams
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Streams
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Abstraktionen
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Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
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Datei-I / O
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File I/O
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String I/O
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Array I/O
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streamoff
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iostream_category(C++11)
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Eingang / Ausgang Manipulatoren
Gleitkomma-Formatierung
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Floating-point formatting
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Integer-Formatierung
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Integer formatting
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Boolean Formatierung
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Boolean formatting
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boolalpha
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Feldbreite und fill Kontrolle
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Field width and fill control
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Andere Formatierungen
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Other formatting
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Whitespace-Verarbeitung
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Whitespace processing
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Output Spülung
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Output flushing
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Statusflags Manipulation
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Status flags manipulation
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Zeit und Geld 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 );
Wenn in einem Ausdruck verwendet out << setbase(base) oder in >> setbase(base), ändert die basefield Flagge des Stroms out oder in, abhängig vom Wert des base: der Wert 16 Sätze basefield um std::ios_base::hex der Wert 8 Sätze std::ios_base::oct der Wert 10 Sätze 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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Werte base ausgenommen 8, 10 oder 16 zurückgesetzt basefield auf Null, die Ausgabe dezimal und Präfix-abhängigen Eingangs entspricht .
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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Inhaltsverzeichnis

[Bearbeiten] Parameter

base -
neuen Wert für BASEFIELD
Original:
new value for basefield
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[Bearbeiten] Rückgabewert

Gibt ein Objekt vom angegebenen Typ, so dass, wenn str der Name eines Output-Stream vom Typ ist std::basic_ostream<CharT, Traits> oder std::basic_istream<CharT, Traits>, dann ist der Ausdruck str << setbase(base) oder str >> setbase(base) verhält, als ob der folgende Code ausgeführt wurde:
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);

[Bearbeiten] Beispiel

#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

[Bearbeiten] Siehe auch

ändert sich die Basis für die ganze I / O verwendet
Original:
changes the base used for integer I/O
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(Funktion) [edit]
steuert, ob Präfix verwendet wird, um numerische Basis anzugeben
Original:
controls whether prefix is used to indicate numeric base
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(Funktion) [edit]