std::basic_ostream::sentry(3)std::basic_ostream::sentry(3)NAME
std::basic_ostream::sentry -
Performs setup work for output streams.
SYNOPSIS
Public Member Functions
operator bool () const
sentry (basic_ostream< _CharT, _Traits > &__os)
~sentry ()
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 377 of file ostream.
Constructor & Destructor Documentation
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 47 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 405 of file ostream.
References std::uncaught_exception(), and std::unitbuf().
Member Function Documentation
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 423 of file ostream.
Author
Generated automatically by Doxygen for libstdc++ from the source code.
libstdc++ 22 Nov 2013 std::basic_ostream::sentry(3)
