On 9 Mai, 05:43, "se...@[EMAIL PROTECTED]
" <se...@[EMAIL PROTECTED]
> wrote:
> The text in [ostream::sentry], p4 should probably be changed
> to read something like
>
> If ((os.flags() & ios_base::unitbuf) && !uncaught_exception())
> is true, calls os.rdbuf()->pubsync().
>
> to avoid this. Let me fix it along with the similar problem
> with the tied stream.
I agree with this..
> I think the numbers have changed between C++ 98 and the latest
> working paper. We should be using section names instead of
> numbers, they don't change (i.e., [ostream.unformatted]).
You are right in both points, as I just notice.
Let me add three related questions, which came to me while
I was searching of references to flush:
1) N2588, [istream::sentry]/2, describes effects in terms of
flush on the result of is.tie(). Wouldn't it make sense to
refer here to is.tie()->rdbuf()->pubsync() as well? All other
effects of this c'tor are already based on rdbuf() functions
(of is).
2) I think that footnote 321, N2588, needs also to be adapted.
3) I have a question regarding [ios::Init]/4: The effects clause
of ~Init() says:
"Destroys an object of class Init. The function subtracts one from
the value stored in init_cnt and, if the resulting stored value is
one, calls cout.flush(), cerr.flush(), clog.flush(), wcout.flush(),
wcerr.flush(), wclog.flush()."
But because flush can (indirectly) throw a ios_base::failure,
I see two problems:
1) Does the standard need to rule this exception, although it
happens after program execution ([iostream.objects]/2)?
2) Actually worse seems to me that the standard seems not to
provide guarantees that such an intermediate throw does not
influence the outstanding flushs. What I mean is the following:
Consider that
cout.flush(), cerr.flush(), ..
are called and cout.flush() throws. Will cerr.flush() and
all remaining flush()'s still be called? I would like to
hear such statement, but during a short survey I couldn't
find anything.
[Please note that these "issues" of (3) are not new, but
I just stumbled across them]
Greetings from Bremen,
Daniel Krügler
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