std::basic_istream::putback
De cppreference.com
 |
This page has been machine-translated from the English version of the wiki using Google Translate.
The translation may contain errors and awkward wording. Hover over text to see the original version. You can help to fix errors and improve the translation. For instructions click here. |
<metanoindex/>
<tbody> </tbody> 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. The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
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.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
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).The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
Em qualquer caso, define o
gcount() contador a zero.Original:
In any case, sets the
gcount() counter to zero.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
Parâmetros
(Nenhum)
Original:
(none)
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
Valor de retorno
*this
Exemplo
demonstra a diferença entre a modificação e não modificar putback ()
Original:
demonstrates the difference between modifying and non-modifying putback()
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
#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";
}
Saída:
Yello, world
putback failed
Hello, world
Veja também
unextracts um personagem Original: unextracts a character The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro) | |
lê o próximo caractere sem extraí-lo Original: reads the next character without extracting it The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro) | |