std::basic_istream< _CharT, _Traits >::sentry(3)	     Library Functions Manual		  std::basic_istream< _CharT, _Traits >::sentry(3)

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 = char_traits<_CharT>>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 657 of file istream.

Member Typedef Documentation
   template<typename _CharT, typename _Traits = char_traits<_CharT>> typedef _Traits std::basic_istream< _CharT, _Traits >::sentry::traits_type
       Easy access to dependent types.

       Definition at line 664 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 47 of file istream.tcc.

       References 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 = char_traits<_CharT>> 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 705 of file istream.

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

libstdc++							  Tue Jun 10 2014		  std::basic_istream< _CharT, _Traits >::sentry(3)