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std::basic_istream::putback

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< cpp‎ | io‎ | basic istream

 
 
De entrada / saída da biblioteca
I / O manipuladores
C estilo de I / O
Buffers
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Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(obsoleta)
Streams
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Streams
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Abstrações
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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
Cordas I / O
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String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Matriz de I / O
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Array I/O
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istrstream(obsoleta)
ostrstream(obsoleta)
strstream(obsoleta)
Tipos
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Types
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streamoff
streamsize
fpos
Interface de categoria de erro
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Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
std::basic_istream
Objetos globais
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Global objects
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cin
wcin
Funções de membro
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Member functions
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basic_istream::basic_istream
basic_istream::~basic_istream
basic_istream::operator=(C++11)
Entrada formatada
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Formatted input
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basic_istream::operator>>
Entrada não formatado
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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
Posicionamento
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Positioning
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basic_istream::tellg
basic_istream::seekg
Diversos
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Miscellaneous
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basic_istream::sync
basic_istream::swap(C++11)
Aulas-Membros
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Member classes
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basic_istream::sentry
Não-membros funções
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Non-member functions
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operator>>(std::basic_istream)
 
basic_istream& putback( char_type ch );
Coloca o personagem ch de volta para o fluxo de entrada de modo que o próximo personagem 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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Primeiro limpa eofbit, em seguida, se comporta como UnformattedInputFunction. Depois de construir e verificar o objeto de sentinela, se rdbuf() não é nulo, chama rdbuf()->sputbackc(ch), que chama rdbuf()->pbackfail(ch) se ch não é igual o personagem mais recentemente 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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Se rdbuf() é nulo ou se rdbuf->sputbackc(ch) retornos Traits::eof(), chama setstate(badbit).
Original:
If rdbuf() is null or if rdbuf->sputbackc(ch) returns Traits::eof(), calls setstate(badbit).
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Em qualquer caso, define o gcount() contador a zero.
Original:
In any case, sets the gcount() counter to zero.
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Índice

[editar] Parâmetros

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

*this

[editar] Exemplo

demonstra a diferença entre a modificação e não modificar 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] Veja também

unextracts um personagem
Original:
unextracts a character
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(função pública membro) [edit]
lê o próximo caractere sem extraí-lo
Original:
reads the next character without extracting it
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(função pública membro) [edit]