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std::basic_...f::showmanyc(3) C++ Standard Libarystd::basic_...f::showmanyc(3) NAME std::basic_streambuf::showmanyc - std::basic_streambuf::showmanyc Synopsis protected: virtual std::streamsize showmanyc(); Estimates the number of characters available for input in the asso- ciated character sequence. underflow() is guaranteed not to return Traits::eof() or throw an exception until at least that many characters are extracted. Parameters (none) Return value The number of characters that are certainly available in the associ- ated 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 0, which has the meaning of "unsure if there are characters available in the associated sequence". Notes The name of this function stands for "stream: how many characters?", so it is pronounced "S how many C", rather than "show many C". Example This section is incomplete Reason: no example Defect reports The following behavior-changing defect reports were applied retroac- tively to previously published C++ standards. DR Applied to Behavior as published Correct behavior underflow() is guaranteed not to extended the guarantee to allow LWG 159 C++98 fail until at least at least showmanyc() characters showmanyc() characters to be are supplied extracted See also in_avail obtains the number of characters immediately available in the get area (public member function) optionally provides the number of characters available for input from the showmanyc file [virtual] (virtual protected member function of std::basic_file- buf<CharT,Traits>) Category: * Todo no example http://cppreference.com 2024.06.10 std::basic_...f::showmanyc(3)
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