bsl::basic_istringstream::unget

Unextracting the previous character.

Synopsis

Declared in <bslstl_istringstream.h>

__istream_type&
unget();

If rdbuf() is not null, calls rdbuf()‐>sungetc(c).

If rdbuf() is null or if sungetc() fails, sets badbit in the error state.

Note	This function first clears eofbit. Since no characters are extracted, the next call to `gcount()` will return 0, as required by DR 60.

*this

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