std::basic_ostream< _CharT, _Traits >::sentry Class Reference

List of all members.


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 381 of file ostream.

Public Member Functions


Constructor & Destructor Documentation

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 52 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 409 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:
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 427 of file ostream.


The documentation for this class was generated from the following files:

Generated on Sat Dec 12 09:40:33 2009 for libstdc++ by  doxygen 1.5.6