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std::basic_istream::putback

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< cpp‎ | io‎ | basic istream

 
 
Entrada / salida de la biblioteca
I / O manipuladores
C-estilo I / O
Buffers
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Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(obsoleto)
Arroyos
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Streams
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Abstracciones
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Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
File I / O
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File I/O
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basic_ifstream
basic_ofstream
basic_fstream
Cadena de I / O
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String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Matriz I / O
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Array I/O
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istrstream(obsoleto)
ostrstream(obsoleto)
strstream(obsoleto)
Tipos
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Types
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streamoff
streamsize
fpos
Error interfaz categoría
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Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
std::basic_istream
Los objetos globales
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Global objects
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cin
wcin
Las funciones miembro
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Member functions
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basic_istream::basic_istream
basic_istream::~basic_istream
basic_istream::operator=(C++11)
Entrada con formato
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Formatted input
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basic_istream::operator>>
Entrada sin formato
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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
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Positioning
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basic_istream::tellg
basic_istream::seekg
Varios
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Miscellaneous
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basic_istream::sync
basic_istream::swap(C++11)
Clases de miembros
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Member classes
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basic_istream::sentry
Terceros funciones
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Non-member functions
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operator>>(std::basic_istream)
 
basic_istream& putback( char_type ch );
Pone el carácter ch de nuevo al flujo de entrada por lo que el siguiente carácter extraído será ch .
Original:
Puts the character ch back to the input stream so the next extracted character will be ch.
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Primero despeja eofbit, entonces se comporta como UnformattedInputFunction. Después de la construcción y comprobación del objeto centinela, si rdbuf() no es nulo, llama rdbuf()->sputbackc(ch), que llama rdbuf()->pbackfail(ch) ch si no es igual al personaje más recientemente extraído .
Original:
First clears eofbit, then behaves as UnformattedInputFunction. After constructing and checking the sentry object, if rdbuf() is not null, calls rdbuf()->sputbackc(ch), which calls rdbuf()->pbackfail(ch) if ch does not equal the most recently extracted character.
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Si rdbuf() es nulo o si vuelve rdbuf->sputbackc(ch) Traits::eof(), llama setstate(badbit) .
Original:
If rdbuf() is null or if rdbuf->sputbackc(ch) returns Traits::eof(), calls setstate(badbit).
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En cualquier caso, establece el gcount() contador a cero .
Original:
In any case, sets the gcount() counter to zero.
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Contenido

[editar] Parámetros

(Ninguno)
Original:
(none)
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[editar] Valor de retorno

*this

[editar] Ejemplo

demuestra la diferencia entre la modificación y no modificando-putback ()
Original:
demonstrates the difference between modifying and non-modifying putback()
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#include <sstream>
#include <iostream>
int main()
{
    std::stringstream s1("Hello, world"); // IO stream
    s1.get();
    if(s1.putback('Y')) // modifies the buffer
        std::cout << s1.rdbuf() << '\n';
    else
        std::cout << "putback failed\n";
 
    std::istringstream s2("Hello, world"); // input-only stream
    s2.get();
    if(s2.putback('Y')) // cannot modify input-only buffer
        std::cout << s2.rdbuf() << '\n';
    else
        std::cout << "putback failed\n";
 
    s2.clear();
    if(s2.putback('H')) // non-modifying putback
        std::cout << s2.rdbuf() << '\n';
    else
        std::cout << "putback failed\n";
}

Output:

Yello, world
putback failed
Hello, world

[editar] Ver también

unextracts un carácter
Original:
unextracts a character
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(miembro público función) [edit]
lee el siguiente carácter sin extraerlo
Original:
reads the next character without extracting it
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(miembro público función) [edit]