Is there a C++ version of ungetc?
That is, can I put a character back onto an istream?
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3 Answers
Yes. istream::putback is the same as ungetc except if using unget():
You can't lie with unget(). It "ungets" the last-read character. You can lie with putback(c). You can "putback" some character other than the last-read character. Sometimes putting back a character other than the last-read character can be useful.
Also, if the underlying read buffer really does have buffering capability, you can "putback" more than one character. I think ungetc() is limited to one character.
3 Comments
R. Martinho Fernandes
istream::unget is not ungetc. You can lie with ungetc.
Puppy
@Martinho: That's just
putback instead
mtraceur
Probably also worth mentioning the
peek method, because most wants for unget are just the second step of implementing "I want to peek the next character".You can put a character back with the istream::putback function. You can even put a different character if you want.
answered Aug 2, 2011 at 16:07
R. Martinho Fernandes
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