std::basic_istream< _CharT, _Traits >::sentry - Performs setup work for input streams.

       Generated automatically by Doxygen for libstdc++ from the source code.

                                                    libstdc++std::basic_istream<_CharT,_Traits>::sentry(3cxx)

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 (notokay) 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).

       References std::ios_base::badbit, std::ios_base::eofbit, std::ios_base::failbit,  std::ios_base::goodbit,
       and std::ios_base::skipws.

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-safeprefixandsuffixoperations, although only prefix actions are currently required by the
       standard.

template<typename_CharT,typename_Traits>std::basic_istream<_CharT,_Traits>::sentry::operatorbool()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).

template<typename_CharT,typename_Traits>typedef_Traitsstd::basic_istream<_CharT,_Traits>::sentry::traits_type
       Easy access to dependent types.

       std::basic_istream< _CharT, _Traits >::sentry - Performs setup work for input streams.

       #include <istream>

   PublicTypestypedef__istream_type::__ctype_type__ctype_typetypedef _Traits::int_type __int_typetypedefbasic_istream< _CharT, _Traits > __istream_typetypedefbasic_streambuf< _CharT, _Traits > __streambuf_typetypedef _Traits traits_type
           Easy access to dependent types.

   PublicMemberFunctionssentry (basic_istream< _CharT, _Traits > &__is, bool __noskipws=false)
           The constructor performs all the work.
       operatorbool () const
           Quick status checking.