std::basic_streambuf::showmanyc

From Cppreference

C++ Standard Library
Language Utilities library Strings library Containers library Algorithms library Iterators library Numerics library Input/output library Localizations library Regular expressions library (C++11) Atomic operations library (C++11) Thread support library (C++11)
Input/output library
I/O manipulators C-style I/O Buffers basic_streambuf basic_filebuf basic_stringbuf strstreambuf (deprecated) Streams Abstractions ios_base basic_ios basic_istream basic_ostream basic_iostream File I/O basic_ifstream basic_ofstream basic_fstream String I/O basic_istringstream basic_ostringstream basic_stringstream Array I/O istrstream (deprecated) ostrstream (deprecated) strstream (deprecated) Types streamoff streamsize fpos Error category interface iostream_category (C++11) io_errc (C++11)
std::basic_streambuf
Public member functions basic_streambuf::~basic_streambuf Locales basic_streambuf::pubimbue basic_streambuf::getloc Positioning basic_streambuf::pubsetbuf basic_streambuf::pubseekoff basic_streambuf::pubseekpos basic_streambuf::pubsync Get area basic_streambuf::in_avail basic_streambuf::snextc basic_streambuf::sbumpc basic_streambuf::sgetc basic_streambuf::sgetn Put area basic_streambuf::sputc basic_streambuf::sputn Putback basic_streambuf::sputbackc basic_streambuf::sungetc Protected member functions basic_streambuf::basic_streambuf basic_streambuf::operator= (C++11) basic_streambuf::swap (C++11) Locales basic_streambuf::imbue Positioning basic_streambuf::setbuf basic_streambuf::seekoff basic_streambuf::seekpos basic_streambuf::sync Get area basic_streambuf::showmanyc basic_streambuf::underflow basic_streambuf::uflow basic_streambuf::xsgetn basic_streambuf::eback basic_streambuf::gptr basic_streambuf::egptr basic_streambuf::gbump basic_streambuf::setg Put area basic_streambuf::xsputn basic_streambuf::overflow basic_streambuf::pbase basic_streambuf::pptr basic_streambuf::epptr basic_streambuf::pbump basic_streambuf::setp Putback basic_streambuf::pbackfail

protected: std::streamsize showmanyc();

Estimates the number of characters available in the sequence. underflow() is guaranteed not to return traits::eof() until at least that many characters are extracted.

Contents 1 Parameters 2 Return value 3 Example 4 See also

[edit] Parameters

(none)

[edit] Return value

The number of characters available in the sequence, or -1 if no characters are available. In that case, underflow() and uflow() will fail.

The base class version returns ​0​.

[edit] Example

This section is incomplete

[edit] See also

in_avail	obtains the number of characters immediately available in the get area (public member function)