libstdc++
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Public Member Functions | |
operator bool () const | |
sentry (basic_ostream< _CharT, _Traits > &__os) | |
~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."
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explicit |
The constructor performs preparatory work.
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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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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inline |