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operator>><div class="t-tr-text">(Std :: basic_istream)<div class="t-tr-dropdown"><div><div><div class="t-tr-dropdown-arrow-border"></div><div class="t-tr-dropdown-arrow"></div><div class="t-tr-dropdown-h">Original:</div><div class="t-tr-dropdown-orig">(std::basic_istream)</div><div class="t-tr-dropdown-notes">The text has been machine-translated via [http://translate.google.com Google Translate].<br/> You can help to correct and verify the translation. Click [http://en.cppreference.com/w/Cppreference:MachineTranslations here] for instructions.</div></div></div></div></div>

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< cpp‎ | io‎ | basic istream

 
 
Entrada / salida de la biblioteca
I / O manipuladores
C-estilo I / O
Buffers
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(obsoleto)
Arroyos
Original:
Streams
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Abstracciones
Original:
Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
File I / O
Original:
File I/O
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basic_ifstream
basic_ofstream
basic_fstream
Cadena de I / O
Original:
String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Matriz I / O
Original:
Array I/O
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istrstream(obsoleto)
ostrstream(obsoleto)
strstream(obsoleto)
Tipos
Original:
Types
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streamoff
streamsize
fpos
Error interfaz categoría
Original:
Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
std::basic_istream
Los objetos globales
Original:
Global objects
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cin
wcin
Las funciones miembro
Original:
Member functions
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basic_istream::basic_istream
basic_istream::~basic_istream
basic_istream::operator=(C++11)
Entrada con formato
Original:
Formatted input
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basic_istream::operator>>
Entrada sin formato
Original:
Unformatted input
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basic_istream::get
basic_istream::peek
basic_istream::unget
basic_istream::putback
basic_istream::getline
basic_istream::ignore
basic_istream::read
basic_istream::readsome
basic_istream::gcount
Posicionamiento
Original:
Positioning
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basic_istream::tellg
basic_istream::seekg
Varios
Original:
Miscellaneous
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basic_istream::sync
basic_istream::swap(C++11)
Clases de miembros
Original:
Member classes
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basic_istream::sentry
Terceros funciones
Original:
Non-member functions
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operator>>(std::basic_istream)
 
template< class CharT, class Traits >

basic_istream<CharT,Traits>& operator>>( basic_istream<CharT,Traits>& st, CharT& ch );

template< class Traits >
basic_istream<char,Traits>& operator>>( basic_istream<char,Traits>& st, signed char& ch );

template< class Traits >

basic_istream<char,Traits>& operator>>( basic_istream<char,Traits>& st, unsigned char& ch );
(1)
template< class CharT, class Traits>

basic_istream<CharT,Traits>& operator>>( basic_istream<CharT,Traits>& st, CharT* s );

template< class Traits >
basic_istream<char,Traits>& operator>>( basic_istream<char,Traits>& st, signed char* s );

template< class Traits >

basic_istream<char,Traits>& operator>>( basic_istream<char,Traits>& st, unsigned char* s );
(2)
template< class CharT, class Traits, class T >
basic_istream<CharT,Traits>& operator>>( basic_istream<CharT,Traits>&& st, T& value );
(3) (desde C++11)
Realiza operaciones de entrada de caracteres .
Original:
Performs character input operations.
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1)
Extractos de un personaje y lo almacena en ch .
Original:
Extracts a character and stores it to ch.
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2)
Extrae caracteres sucesivos y los almacena en lugares sucesivos de una matriz de caracteres cuyo primer elemento es apuntado por s. La extracción se detiene si una de las condiciones siguientes:
Original:
Extracts successive characters and stores them at successive locations of a character array whose first element is pointed to by s. The extraction stops if one of the following conditions are met:
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  • un carácter de espacio (como se determina por la faceta ctype<CharT>) se encuentra. El espacio en blanco no se extrae .
    Original:
    a whitespace character (as determined by the ctype<CharT> facet) is found. The whitespace character is not extracted.
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  • this->width() - 1 caracteres se extraen
    Original:
    this->width() - 1 characters are extracted
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En cualquier caso, un carácter nulo adicional CharT() valor se almacena en el extremo de la salida .
Original:
In either case, an additional null character value CharT() is stored at the end of the output.
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3)
Llama al operador de extracción adecuado, dada una referencia a un objeto rvalue flujo de entrada (equivalente a st >> value) .
Original:
Calls the appropriate extraction operator, given an rvalue reference to an input stream object (equivalent to st >> value).
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Contenido

[editar] Notas

Las versiones (1-2) de la operadora se comportan como funciones de entrada con formato'. Es decir, construir un objeto sentry al principio que vacía el empate () 'd tampones si es necesario, el control de errores, así como extractos y descarta todos los principales espacios en blanco a menos que la bandera ios_base :: skipws fue absuelto. La entrada se trató sólo si el objeto sentry devuelve true .
Original:
The (1-2) versions of the operator behave as formatted input functions. That is, they construct a sentry object at the beginning that flushes the tie()'d buffers if needed, checks for errors, and extracts and discards all leading whitespace characters unless the ios_base::skipws flag was cleared. The input is attempted only if the sentry object returns true.
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[editar] Parámetros

st -
flujo de entrada para extraer los datos de
Original:
input stream to extract the data from
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ch -
referencia a un carácter para almacenar el carácter extraídos
Original:
reference to a character to store the extracted character to
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s -
puntero a una cadena de caracteres para almacenar los caracteres extraídos
Original:
pointer to a character string to store the extracted characters to
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[editar] Valor de retorno

st

[editar] Ejemplo

#include <iostream>
#include <iomanip>
#include <sstream>
 
int main()
{
    std::string input = "n greetings";
    std::istringstream stream(input);
    char c;
    const int MAX = 6;
    char cstr[MAX];
 
    stream >> c >> std::setw(MAX) >> cstr;
    std::cout << "c = " << c << '\n'
              << "cstr = " << cstr << '\n';
 
    double f;
    std::istringstream("1.23") >> f; // rvalue stream extraction
    std::cout << "f = " << f << '\n';
}

Output:

c = n
cstr = greet
f = 1.23

[editar] Ver también

extractos de formato de datos
Original:
extracts formatted data
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(miembro público función) [edit]