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std::basic_ostream_sentry
Langue: en
Version: 323429 (ubuntu - 08/07/09)
Section: 3 (Bibliothèques de fonctions)
Sommaire
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
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.
Constructor & Destructor Documentation
template<typename _CharT, typename _Traits> std::basic_ostream< _CharT, _Traits >::basic_ostream::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 >::basic_ostream::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().
Member Function Documentation
template<typename _CharT, typename _Traits> std::basic_ostream< _CharT, _Traits >::basic_ostream::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.
Author
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