Estimates the number of characters available for input in the associated character sequence. underflow() is guaranteed not to return Traits::eof() or throw an exception until at least that many characters are extracted.
[edit] Parameters(none)
[edit] Return valueThe number of characters that are certainly available in the associated character sequence, or -1 if showmanyc can determine, without blocking, that no characters are available. If showmanyc returns -1, underflow() and uflow() will definitely return Traits::eof or throw.
The base class version returns â0â, which has the meaning of "unsure if there are characters available in the associated sequence".
[edit] NotesThe name of this function stands for "stream: how many characters?", so it is pronounced "S how many C", rather than "show many C".
[edit] Example [edit] Defect reportsThe following behavior-changing defect reports were applied retroactively to previously published C++ standards.
DR Applied to Behavior as published Correct behavior LWG 159 C++98 underflow() is guaranteed not to fail untilshowmanyc() characters are supplied extended the guarantee to allow at least
showmanyc() characters to be extracted [edit] See also obtains the number of characters immediately available in the get area
std::basic_filebuf<CharT,Traits>) [edit]
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