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

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

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 426 of file ostream.

Constructor & Destructor Documentation

sentry()

template<typename _CharT, typename _Traits>

std::basic_ostream< _CharT, _Traits >::sentry::sentry ( basic_ostream< _CharT, _Traits > &  __os )

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.

References std::ios_base::failbit, std::basic_ios< _CharT, _Traits >::good(), std::basic_ios< _CharT, _Traits >::setstate(), and std::basic_ios< _CharT, _Traits >::tie().

~sentry()

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 456 of file ostream.

Member Function Documentation

operator bool()

template<typename _CharT, typename _Traits>

std::basic_ostream< _CharT, _Traits >::sentry::operator bool ( ) const

inlineexplicit

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 478 of file ostream.

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

• ostream
• ostream.tcc