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C-style file input/output
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operator<<(std::basic_ostream)
operator>>(std::basic_istream)
std::basic_filebuf
std::basic_filebuf::basic_filebuf
std::basic_filebuf::close
std::basic_filebuf::imbue
std::basic_filebuf::is_open
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std::basic_filebuf::overflow
std::basic_filebuf::pbackfail
std::basic_filebuf::seekoff
std::basic_filebuf::seekpos
std::basic_filebuf::setbuf
std::basic_filebuf::showmanyc
std::basic_filebuf::swap
std::basic_filebuf::sync
std::basic_filebuf::uflow
std::basic_filebuf::underflow
std::basic_fstream
std::basic_fstream::basic_fstream
std::basic_fstream::close
std::basic_fstream::is_open
std::basic_fstream::open
std::basic_fstream::rdbuf
std::basic_fstream::swap
std::basic_ifstream
std::basic_ifstream::basic_ifstream
std::basic_ifstream::close
std::basic_ifstream::is_open
std::basic_ifstream::open
std::basic_ifstream::rdbuf
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std::basic_ios
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std::basic_ios::operator bool
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std::basic_ios::swap
std::basic_ios::tie
std::basic_ios::widen
std::basic_iostream
std::basic_iostream::basic_iostream
std::basic_iostream::swap
std::basic_istream
std::basic_istream::basic_istream
std::basic_istream::gcount
std::basic_istream::get
std::basic_istream::getline
std::basic_istream::ignore
std::basic_istream::operator>>
std::basic_istream::peek
std::basic_istream::putback
std::basic_istream::read
std::basic_istream::readsome
std::basic_istream::seekg
std::basic_istream::sentry
std::basic_istream::swap
std::basic_istream::sync
std::basic_istream::tellg
std::basic_istream::unget
std::basic_istringstream
std::basic_istringstream::basic_istringstream
std::basic_istringstream::rdbuf
std::basic_istringstream::str
std::basic_istringstream::swap
std::basic_ofstream
std::basic_ofstream::basic_ofstream
std::basic_ofstream::close
std::basic_ofstream::is_open
std::basic_ofstream::open
std::basic_ofstream::rdbuf
std::basic_ofstream::swap
std::basic_ostream
std::basic_ostream::basic_ostream
std::basic_ostream::flush
std::basic_ostream::operator<<
std::basic_ostream::put
std::basic_ostream::seekp
std::basic_ostream::sentry
std::basic_ostream::swap
std::basic_ostream::tellp
std::basic_ostream::write
std::basic_ostringstream
std::basic_ostringstream::basic_ostringstream
std::basic_ostringstream::rdbuf
std::basic_ostringstream::str
std::basic_ostringstream::swap
std::basic_streambuf
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std::basic_streambuf::sgetc
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std::basic_streambuf::showmanyc
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std::basic_streambuf::sputbackc
std::basic_streambuf::sputc
std::basic_streambuf::sputn
std::basic_streambuf::sungetc
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std::fwide
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std::getc
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std::ostrstream::rdbuf
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std::printf
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std::rename
std::resetiosflags
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std::right
std::scanf
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std::setiosflags
std::setprecision
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std::showbase
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std::showpos
std::skipws
std::snprintf
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std::sscanf
std::streamoff
std::streamsize
std::strstream
std::strstream::freeze
std::strstream::pcount
std::strstream::rdbuf
std::strstream::str
std::strstream::strstream
std::strstreambuf
std::strstreambuf::freeze
std::strstreambuf::overflow
std::strstreambuf::pbackfail
std::strstreambuf::pcount
std::strstreambuf::seekoff
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std::strstreambuf::setbuf
std::strstreambuf::str
std::strstreambuf::strstreambuf
std::strstreambuf::underflow
std::swap(std::basic_filebuf)
std::swap(std::basic_fstream)
std::swap(std::basic_ifstream)
std::swap(std::basic_istringstream)
std::swap(std::basic_ofstream)
std::swap(std::basic_ostringstream)
std::swap(std::basic_stringbuf)
std::swap(std::basic_stringstream)
std::swprintf
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std::tmpfile
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std::ungetc
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std::vprintf
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std::vwscanf
std::wcerr
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std::wscanf
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std::basic_streambuf::in_avail

性病：基本[医]流光：：[医]起效

std::streamsize in_avail(​​

返回GET区域中可用的字符数。如果读取位置可用，则有效地返回egptr() - gptr()的面积。在这种情况下，返回的字节数是可以在不调用缓冲区的情况下从缓冲区中提取的字节数。underflow()...

如果get区域为空，则调用showmanyc()若要确定关联字符序列中可用的字节数，请执行以下操作。在这种情况下，返回的值是可以从缓冲区提取的字节数，而它的%27保证underflow()不会回来Traits::eof...

参数

%280%29

返回值

可用于非阻塞读取的字符数为%28，或者是GET区域的大小，或者是可以从关联字符序列%29读取的字符数，或者-1如果关联序列中没有字符可用，则为showmanyc()能看出来。

例

另见

showmanyc virtualoptionally provides the number of characters available for input from the file (virtual protected member function of std::basic_filebuf)
readsomeextracts already available blocks of characters (public member function of std::basic_istream)

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