NAME

       std::basic_ostream< _CharT, _Traits >::sentry - Performs setup work for output streams.

SYNOPSIS

   Public Member Functions
       sentry (basic_ostream< _CharT, _Traits > &__os)
           The constructor performs preparatory work.
       ~sentry ()
           Possibly flushes the stream.
       operator bool () const
           Quick status checking.

Detailed Description

   template<typename _CharT, typename _Traits>
       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 432 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 46 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 > 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 462 of file ostream.

Member Function Documentation

   template<typename _CharT , typename _Traits > 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 484 of file ostream.

Author

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

libstdc++                                Tue Fstd::basic_ostream< _CharT, _Traits >::sentry(3cxx)