std::ws

 

C++

Linguaggio

Concetti

Libreria di Utilità

Stringhe

Contenitori

Algoritmi

Iteratori

Libreria matematca

Input/output

Localizzazione

Espressioni regolari(C++11)

Operazioni atomicche(C++11)

Multithreading(C++11)

 

Ingresso / libreria di output

I / O manipolatori

C-style I / O

Buffer Original: Buffers The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_streambuf

basic_filebuf

basic_stringbuf

strstreambuf (deprecato)

Streams Original: Streams The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Astrazioni Original: Abstractions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

ios_base

basic_ios

basic_istream

basic_ostream

basic_iostream

File I / O Original: File I/O The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_ifstream

basic_ofstream

basic_fstream

String I / O Original: String I/O The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_istringstream

basic_ostringstream

basic_stringstream

Array I / O Original: Array I/O The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

istrstream (deprecato)

ostrstream (deprecato)

strstream (deprecato)

Tipi Original: Types The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

streamoff

streamsize

fpos

Errore categoria interfaccia Original: Error category interface The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

iostream_category (C++11)

io_errc (C++11)

 

Ingresso / uscita manipolatori

Virgola mobile formattazione Original: Floating-point formatting The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
showpoint noshowpoint setprecision	fixed scientific hexfloat defaultfloat (C++11) (C++11)
Formattazione Integer Original: Integer formatting The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
setbase showbase noshowbase	dec hex oct
Formattazione Boolean Original: Boolean formatting The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
boolalpha noboolalpha
Larghezza del campo e il controllo di riempimento Original: Field width and fill control The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
setfill setw	internal left right
Di formattazione Original: Other formatting The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
showpos noshowpos	uppercase nouppercase
Elaborazione degli spazi vuoti Original: Whitespace processing The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
ws ends	skipws noskipws
Uscita di lavaggio Original: Output flushing The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
flush endl	unitbuf nounitbuf
Flag di stato manipolazione Original: Status flags manipulation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
resetiosflags	setiosflags
Tempo e denaro I / O Original: Time and money I/O The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
get_money (C++11) get_time (C++11)	put_money (C++11) put_time (C++11)

 

Elemento definito nell'header <istream>
template<class CharT, class Traits > std::basic_istream<CharT,Traits>& ws(std::basic_istream<CharT, Traits>& is );

I rigetti spazi vuoti da un flusso di input.

Original:

Discards leading whitespace from an input stream.

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Si comporta come un UnformattedInputFunction, tranne che is.gcount() non viene modificato. Dopo la costruzione e la verifica dell'oggetto sentinella, estrae i caratteri dal flusso e scarta loro fino a quando una delle seguenti condizioni:

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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• condizione di fine file avviene nella sequenza di input (in questo caso la funzione chiama setstate(eofbit) ma non imposta 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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• c il successivo carattere disponibile nella sequenza di input non è uno spazio determinato dal std::isspace(c, is.getloc()). La non-spazio bianco carattere non è estratto.

  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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Questo è un ingresso solo manipolatore di I / O, può essere chiamato con espressioni quali in << std::ws per qualsiasi in di tipo 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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Parametri

is

-

riferimento al flusso di input Original: reference to input stream The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Valore di ritorno

is (riferimento al flusso dopo l'estrazione di spazi consecutivi)

Original:

is (reference to the stream after extraction of consecutive whitespace)

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Esempio

#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"

Vedi anche

ignore	estratti e personaggi scarta fino a quando il carattere dato è stato trovato Original: extracts and discards characters until the given character is found The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico)