libstdc++
Public Member Functions
std::basic_ostream< _CharT, _Traits >::sentry Class Reference

List of all members.

Public Member Functions

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 398 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:
__osThe 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 49 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>
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 426 of file ostream.

References std::ios_base::badbit, std::uncaught_exception(), and std::ios_base::unitbuf.

Member Function Documentation

template<typename _CharT, typename _Traits>
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 447 of file ostream.

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