NAME¶

std::basic_ostream< _CharT, _Traits >::sentry -

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) [explicit]¶

The constructor performs preparatory work. Parameters: 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: 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¶

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