std::basic_istream::putback
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< cpp | io | basic istream
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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.
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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.The text has been machine-translated via Google Translate.
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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).The text has been machine-translated via Google Translate.
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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.
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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 bufferstd::cout<< s1.rdbuf()<<'\n';elsestd::cout<<"putback failed\n"; std::istringstream s2("Hello, world");// input-only stream s2.get();if(s2.putback('Y'))// cannot modify input-only bufferstd::cout<< s2.rdbuf()<<'\n';elsestd::cout<<"putback failed\n"; s2.clear();if(s2.putback('H'))// non-modifying putbackstd::cout<< s2.rdbuf()<<'\n';elsestd::cout<<"putback failed\n";}
Saída:
Yello, world putback failed Hello, world
[editar]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) | |
