std::basic_ostream_sentry(3) [centos man page]
std::basic_ostream< _CharT, _Traits >::sentry(3) Library Functions Manual std::basic_ostream< _CharT, _Traits >::sentry(3) NAME
std::basic_ostream< _CharT, _Traits >::sentry - SYNOPSIS
Public Member Functions sentry (basic_ostream< _CharT, _Traits > &__os) ~sentry () operator bool () const Detailed Description template<typename _CharT, typename _Traits = char_traits<_CharT>>class std::basic_ostream< _CharT, _Traits >::sentry Performs setup work for output streams. Objects of this class are created before all of the standard inserters are run. It is responsible for exception-safe prefix and suffix operations. Definition at line 400 of file ostream. Constructor &; Destructor Documentation template<typename _CharT, typename _Traits> std::basic_ostream< _CharT, _Traits >::sentry::sentry (basic_ostream< _CharT, _Traits > &__os) [explicit] The constructor performs preparatory work. Parameters: __os The output stream to guard. If the stream state is good (__os.good() is true), then if the stream is tied to another output stream, is.tie()->flush() is called to synchronize the output sequences. If the stream state is still good, then the sentry state becomes true (okay). Definition at line 47 of file ostream.tcc. References std::ios_base::failbit, std::basic_ios< _CharT, _Traits >::good(), std::basic_ios< _CharT, _Traits >::setstate(), and std::basic_ios< _CharT, _Traits >::tie(). template<typename _CharT, typename _Traits = char_traits<_CharT>> std::basic_ostream< _CharT, _Traits >::sentry::~sentry () [inline] Possibly flushes the stream. If ios_base::unitbuf is set in os.flags(), and std::uncaught_exception() is true, the sentry destructor calls flush() on the output stream. Definition at line 428 of file ostream. References std::ios_base::badbit, std::uncaught_exception(), and std::ios_base::unitbuf. Member Function Documentation template<typename _CharT, typename _Traits = char_traits<_CharT>> std::basic_ostream< _CharT, _Traits >::sentry::operator bool () const [inline], [explicit] Quick status checking. Returns: The sentry state. For ease of use, sentries may be converted to booleans. The return value is that of the sentry state (true == okay). Definition at line 449 of file ostream. Author Generated automatically by Doxygen for libstdc++ from the source code. libstdc++ Tue Jun 10 2014 std::basic_ostream< _CharT, _Traits >::sentry(3)
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std::basic_istream< _CharT, _Traits >::sentry(3cxx) std::basic_istream< _CharT, _Traits >::sentry(3cxx) NAME
std::basic_istream< _CharT, _Traits >::sentry - SYNOPSIS
Public Types typedef __istream_type::__ctype_type __ctype_type" typedef _Traits::int_type __int_type typedef basic_istream< _CharT, _Traits > __istream_type" typedef basic_streambuf < _CharT, _Traits > __streambuf_type" typedef _Traits traits_type Public Member Functions sentry (basic_istream< _CharT, _Traits > &__is, bool __noskipws=false) operator bool () const Detailed Description template<typename _CharT, typename _Traits>class std::basic_istream< _CharT, _Traits >::sentry Performs setup work for input streams. Objects of this class are created before all of the standard extractors are run. It is responsible for exception-safe prefix and suffix operations, although only prefix actions are currently required by the standard. Definition at line 638 of file istream. Member Typedef Documentation template<typename _CharT, typename _Traits> typedef _Traits std::basic_istream< _CharT, _Traits >::sentry::traits_type Easy access to dependant types. Definition at line 645 of file istream. Constructor &; Destructor Documentation template<typename _CharT, typename _Traits> std::basic_istream< _CharT, _Traits >::sentry::sentry (basic_istream< _CharT, _Traits > &__is, bool__noskipws = false) [explicit] The constructor performs all the work. Parameters: is The input stream to guard. noskipws Whether to consume whitespace or not. If the stream state is good (is.good() is true), then the following actions are performed, otherwise the sentry state is false (not okay) and failbit is set in the stream state. The sentry's preparatory actions are: 1. if the stream is tied to an output stream, is.tie()->flush() is called to synchronize the output sequence 2. if noskipws is false, and ios_base::skipws is set in is.flags(), the sentry extracts and discards whitespace characters from the stream. The currently imbued locale is used to determine whether each character is whitespace. If the stream state is still good, then the sentry state becomes true (okay). Definition at line 49 of file istream.tcc. References std::basic_ios< _CharT, _Traits >::eof(), std::ios_base::eofbit, std::ios_base::failbit, std::ios_base::flags(), std::basic_ios< _CharT, _Traits >::good(), std::ios_base::goodbit, std::__ctype_abstract_base< _CharT >::is(), std::basic_ios< _CharT, _Traits >::rdbuf(), std::basic_ios< _CharT, _Traits >::setstate(), std::basic_streambuf< _CharT, _Traits >::sgetc(), std::ios_base::skipws, std::basic_streambuf< _CharT, _Traits >::snextc(), and std::basic_ios< _CharT, _Traits >::tie(). Member Function Documentation template<typename _CharT, typename _Traits> std::basic_istream< _CharT, _Traits >::sentry::operator bool () const [inline], [explicit] Quick status checking. Returns: The sentry state. For ease of use, sentries may be converted to booleans. The return value is that of the sentry state (true == okay). Definition at line 686 of file istream. Author Generated automatically by Doxygen for libstdc++ from the source code. libstdc++ Tue Nov 27 2012 std::basic_istream< _CharT, _Traits >::sentry(3cxx)