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std::setw

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< cpp‎ | io‎ | manip

 
 
Input / Output-Bibliothek
I / O-Manipulatoren
C-style I / O
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
basic_iostream
Datei-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(veraltet)
ostrstream(veraltet)
strstream(veraltet)
Types
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Types
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streamoff
streamsize
fpos
Fehler Kategorie Schnittstelle
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Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
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
noboolalpha
Feldbreite und fill Kontrolle
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Field width and fill control
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setfill
setw
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*/ setw( int n );
Wenn in einem Ausdruck verwendet out << setw(n) oder in >> setw(n), setzt die width Parameter der Strom out oder in genau n. Dieser Wert ist nicht "klebrig": Der nächste Eingang oder Ausgang Operation, die durch den Wert des Streams width Bereich betroffen ist, wird sie auf Null (im Sinne von "unspezifiziert") .
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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Inhaltsverzeichnis

[Bearbeiten] Parameter

n -
neuen Wert für die Breite
Original:
new value for width
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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 << setw(n) oder str >> setw(n) 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 << setw(n) or str >> setw(n) behaves as if the following code was executed:
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str.width(n);

[Bearbeiten] Beispiel

#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"

[Bearbeiten] Siehe auch

manages field width
(öffentliche Elementfunktion of std::ios_base) [edit]
ändert sich die Füllzeichen
Original:
changes the fill character
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(Funktions-Template) [edit]