std::basic_ostream< _CharT,std::basic:ostream<3cCharT, _Traits >::sentry(3cxx)
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.
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).
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.
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).
Author
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libstdc++ std::basicaostream<3_CharT, _Traits >::sentry(3cxx)
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