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From: Nathan Myers <ncm@cantrip.org> To: paolo@gcc.gnu.org Cc: gcc-prs@gcc.gnu.org, Subject: Re: libstdc++/9424: i/ostream::operator>>/<<(streambuf*) drops characters Date: Fri, 07 Mar 2003 19:56:00 -0000 [thread overview] Message-ID: <20030307195600.17948.qmail@sources.redhat.com> (raw) The following reply was made to PR libstdc++/9424; it has been noted by GNATS. From: Nathan Myers <ncm@cantrip.org> To: libstdc++@gcc.gnu.org Cc: gcc-gnats@gcc.gnu.org Subject: Re: libstdc++/9424: i/ostream::operator>>/<<(streambuf*) drops characters Date: Fri, 7 Mar 2003 11:50:55 -0800 On Wed, Feb 26, 2003 at 09:27:32AM -0000, P?tur Run?lfsson wrote: > I believe the relevant quote is in 27.6.2.5.3 p7, bullet 2: > > inserting in the output sequence fails (in which case the > character to be inserted is not extracted); > > So correct code is "as if": > > int_type c = sbin->sgetc(); > while (c != traits_type::eof()) > { > if (sbout->sputc(c) == traits_type::eof()) > break; > c = sbin->snextc(); > } > > Of course, it should be OK to call sgetn if the function *knows* > that sputc won't fail (for example if epptr() - pptr() is big > enough). I wonder if this wouldn't be better implemented using sbumpc: > int_type c; > while ((c = sbin->sbumpc()) != traits_type::eof() && > (sbout->sputc(c) != traits_type::eof()) > {} I seem to recall that sbumpc() can be implemented more efficiently than snextc, although it's just possible I was smoking crack. Nathan Myers ncm-nospam@cantrip.org
next reply other threads:[~2003-03-07 19:56 UTC|newest] Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top 2003-03-07 19:56 Nathan Myers [this message] -- strict thread matches above, loose matches on Subject: below -- 2003-03-09 11:27 paolo 2003-03-07 21:26 Paolo Carlini 2003-02-26 9:36 Pétur Runólfsson 2003-02-26 0:34 paolo 2003-01-23 19:06 peturr02
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