std::basic_ostream<; _CharT, _Tstd::basic_ostream< _CharT, _Traits >::sentry(3)NAME
std::basic_ostream< _CharT, _Traits >::sentry -
SYNOPSIS
Public Member Functions
sentry (basic_ostream< _CharT, _Traits > &__os)
~sentry ()
operator bool () const
Detailed Description
template<typename _CharT, typename _Traits = char_traits<_CharT>>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 400 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 47 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 = char_traits<_CharT>>
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 428 of file ostream.
References std::ios_base::badbit, std::uncaught_exception(), and
std::ios_base::unitbuf.
Member Function Documentation
template<typename _CharT, typename _Traits = char_traits<_CharT>>
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 449 of file ostream.
Author
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libstdc++ std::basic_ostream< _CharT, _Traits >::sentry(3)
