c++ - ungetc 有 C++ 版本吗？

Question

是否有 ungetc 的 C++ 版本？

也就是说，我可以将角色放回 istream 吗？

Answer 1

是的。 istream::putback与 ungetc except if using unget() 相同:

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.