std::basic_ostream::sentry - Online Linux Manual PageSection : 3
Updated : 19 Jun 2018
Source : libstdc++

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NAMEstd::basic_ostream::sentry − Performs setup work for output streams.

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SYNOPSIS

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Public Member Functionsoperator bool () const
sentry (basic_ostream< _CharT, _Traits > &__os)
~sentry ()

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Detailed Description

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template<typename _CharT, typename _Traits> class std::basic_ostream< _CharT, _Traits >::sentryPerforms 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.

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Constructor & Destructor Documentation

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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.

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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().

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Member Function Documentation

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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.

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AuthorGenerated automatically by Doxygen for libstdc++ from the source code. 0

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