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std::ws

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< cpp‎ | io‎ | manip

 
 
Input / Output-Bibliothek
I / O-Manipulatoren
C-style I / O
Puffern
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(veraltet)
Streams
Original:
Streams
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Abstraktionen
Original:
Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
Datei-I / O
Original:
File I/O
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basic_ifstream
basic_ofstream
basic_fstream
String I / O
Original:
String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Array I / O
Original:
Array I/O
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istrstream(veraltet)
ostrstream(veraltet)
strstream(veraltet)
Types
Original:
Types
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streamoff
streamsize
fpos
Fehler Kategorie Schnittstelle
Original:
Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
Eingang / Ausgang Manipulatoren
Gleitkomma-Formatierung
Original:
Floating-point formatting
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Integer-Formatierung
Original:
Integer formatting
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Boolean Formatierung
Original:
Boolean formatting
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boolalpha
noboolalpha
Feldbreite und fill Kontrolle
Original:
Field width and fill control
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Andere Formatierungen
Original:
Other formatting
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Whitespace-Verarbeitung
Original:
Whitespace processing
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ws
ends
Output Spülung
Original:
Output flushing
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Statusflags Manipulation
Original:
Status flags manipulation
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Zeit und Geld I / O
Original:
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 <istream>
template< class CharT, class Traits >
std::basic_istream<CharT,Traits>& ws( std::basic_istream<CharT, Traits>& is );
Verwirft führenden Leerzeichen aus einem Input-Stream .
Original:
Discards leading whitespace from an input stream.
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Verhält sich als UnformattedInputFunction, ausgenommen is.gcount() wird nicht modifiziert. Nach dem Bau und Prüfung der Schildwache Objekts, extrahiert Zeichen aus dem Stream und verwirft sie, bis eine der folgenden Bedingungen erfüllt ist:
Original:
Behaves as an UnformattedInputFunction, except that is.gcount() is not modified. After constructing and checking the sentry object, extracts characters from the stream and discards them until any one of the following conditions occurs:
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  • Ende der Datei auftritt in der Eingangssequenz (in diesem Fall die Funktion aufruft setstate(eofbit) aber nicht gesetzt failbit .
    Original:
    end of file condition occurs in the input sequence (in which case the function calls setstate(eofbit) but does not set failbit.
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  • das nächste verfügbare Zeichen c in der Eingabesequenz nicht Leerzeichen wie std::isspace(c, is.getloc()) bestimmt. Die Nicht-Whitespace-Zeichen nicht extrahiert .
    Original:
    the next available character c in the input sequence is not whitespace as determined by std::isspace(c, is.getloc()). The non-whitespace character is not extracted.
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Dies ist ein Eingang-only I / O-Manipulator, kann es mit einem Ausdruck wie in << std::ws für jeden in des Typs aufgerufen werden std::basic_istream .
Original:
This is an input-only I/O manipulator, it may be called with an expression such as in << std::ws for any in of type std::basic_istream.
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Inhaltsverzeichnis

[Bearbeiten] Parameter

is -
Verweis auf Input-Stream
Original:
reference to input stream
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[Bearbeiten] Rückgabewert

is (Verweis auf den Strom nach der Extraktion von aufeinander folgenden Leerzeichen)
Original:
is (reference to the stream after extraction of consecutive whitespace)
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[Bearbeiten] Beispiel

#include <iostream>
#include <sstream>
int main()
{
    std::istringstream s("     this is a test");
    std::string line;
    s >> std::ws;
    getline(s, line);
    std::cout << "ws + getline returns: \"" << line << "\"\n";
}

Output:

ws + getline returns: "this is a test"

[Bearbeiten] Siehe auch

Extrakte aus und verwirft Zeichen, bis die gegebene Zeichen gefunden wird
Original:
extracts and discards characters until the given character is found
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(öffentliche Elementfunktion of std::basic_istream) [edit]