std::basic_ostream::sentry(3)

NAME

std::basic_ostream::sentry

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.' Additional actions may be added by the implementation, and we list them in
http://gcc.gnu.org/onlinedocs/libstdc++/17_intro/howto.html#5 under
[27.6] notes.; Definition at line 384 of file ostream.
Public Member Functions: operator bool () const
sentry (basic_ostream< _CharT, _Traits > &__os) ~sentry ()

template<typename _CharT, typename _Traits> std::basic_ostream< _CharT,: _Traits >::sentry::sentry (basic_ostream< _CharT, _Traits > & __os) [inline, 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 52 of file ostream.tcc.
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 412 of file ostream.; References std::uncaught_exception(), and std::unitbuf().

template<typename _CharT, typename _Traits> std::basic_ostream< _CharT,: _Traits >::sentry::operator bool () const [inline] 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 430 of file ostream.

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