Espacios de nombres
Variantes

    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>

    De cppreference.com

    Esta página se ha traducido por ordenador/computador/computadora de la versión en inglés de la Wiki usando Google Translate.

    La traducción puede contener errores y palabras aparatosas/incorrectas. Planea sobre el texto para ver la versión original. Puedes ayudar a corregir los errores y mejorar la traducción. Para instrucciones haz clic aquí.

     
    C++
    Apoyo de compiladores
    Implementaciones independientes y albergadas
    Lenguaje
    Biblioteca estándar
    Encabezados de la biblioteca estándar
    Requisitos denominados
    Macros de prueba de característica (C++20)
    Biblioteca de apoyo del lenguaje
    Biblioteca de conceptos (C++20)
    Biblioteca de diagnósticos
    Biblioteca de gestión de memoria
    Biblioteca de metaprogramación (C++11)
    Biblioteca de servicios generales
    Biblioteca de contenedores
    Biblioteca de iteradores
    Biblioteca de rangos (C++20)
    Biblioteca de algoritmos
    Biblioteca de cadenas
    Biblioteca de procesamiento de texto
    Biblioteca numérica
    Biblioteca de fecha y hora
    Biblioteca de entrada/salida
    Biblioteca del sistema de archivos (C++17)
    Biblioteca de apoyo de concurrencia (C++11)
    Biblioteca de apoyo de ejecución (C++26)
    Especificaciones técnicas
    Índice de símbolos
    Bibliotecas externas
     
    Biblioteca de E/S
    Manipuladores de E/S
    E/S estilo C
    Búferes
    (en desuso en C++98)
    (C++20)
    Flujos
    Abstracciones
    E/S de archivos
    E/S de cadenas
    E/S de arrays
    (en desuso en C++98)
    (en desuso en C++98)
    (en desuso en C++98)
    Salida sincronizada
    (C++20)
    Tipos
    Interfaz de categoría de error
    (C++11)
    (C++11)
     
    std::basic_istream
    Los objetos globales
    Original:
    Global objects
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.
    Las funciones miembro
    Original:
    Member functions
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.
    (C++11)
    Entrada con formato
    Original:
    Formatted input
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.
    Entrada sin formato
    Original:
    Unformatted input
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.
    Posicionamiento
    Original:
    Positioning
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.
    Varios
    Original:
    Miscellaneous
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.
    (C++11)
    Clases de miembros
    Original:
    Member classes
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.
    Terceros funciones
    Original:
    Non-member functions
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.
     
    <tbody> </tbody>
    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.
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.

    1)

    Extractos de un personaje y lo almacena en ch .
    Original:
    Extracts a character and stores it to ch.
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.

    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:
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.
    • 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.
      The text has been machine-translated via Google Translate.
      You can help to correct and verify the translation. Click here for instructions.
    • this->width() - 1 caracteres se extraen
      Original:
      this->width() - 1 characters are extracted
      The text has been machine-translated via Google Translate.
      You can help to correct and verify the translation. Click here for instructions.
    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.
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.

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

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

    Parámetros

    st -
    flujo de entrada para extraer los datos de
    Original:
    input stream to extract the data from
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.
    ch -
    referencia a un carácter para almacenar el carácter extraídos
    Original:
    reference to a character to store the extracted character to
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.
    s -
    puntero a una cadena de caracteres para almacenar los caracteres extraídos
    Original:
    pointer to a character string to store the extracted characters to
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.

    Valor de retorno

    st

    Ejemplo

    Ejecuta este código
    #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';
}

    Salida: 

    c = n
cstr = greet
f = 1.23

    Ver también

    		 extraer datos con formato
    (función miembro pública) [editar]