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From "Martin Sebor (JIRA)" <j...@apache.org>
Subject [jira] Commented: (STDCXX-205) std::operator<<(ostream, string) calls width(0) regardless of sentry
Date Tue, 11 Jul 2006 18:58:32 GMT
    [ http://issues.apache.org/jira/browse/STDCXX-205?page=comments#action_12420401 ] 

Martin Sebor commented on STDCXX-205:
-------------------------------------

As pointed in the post linked above, lib.string.io, p5, requires that width(0) be called after
the characters have been [presumably successfully] inserted into the stream's buffer:

-5- Effects: Begins by constructing a sentry object k as if k were constructed by typename
basic_ostream<charT, traits>::sentry k (os ). If bool(k) is true, determines padding
as described in 22.2.2.2.2, then inserts the resulting sequence of characters seq as if by
calling os.rdbuf()->sputn(seq , n), where n is the
larger of os.width() and str.size(); then calls os .width(0). If the call to sputn fails,
calls os .setstate(ios_base::failbit).

> std::operator<<(ostream, string) calls width(0) regardless of sentry
> --------------------------------------------------------------------
>
>          Key: STDCXX-205
>          URL: http://issues.apache.org/jira/browse/STDCXX-205
>      Project: C++ Standard Library
>         Type: Bug

>   Components: 21. Strings
>     Versions: 4.1.3
>  Environment: all
>     Reporter: Anton Pevtsov
>     Assignee: Martin Sebor
>     Priority: Minor

>
> The following test fails:
> #include <iostream>
> #include <sstream>
> #include <string>
> #include <cassert>
> int main(int argc, char* argv[])
> {
>     std::string str ("abcdefghijk");
>     std::ostringstream os;
>     const std::streamsize width = 2;
>     os.width (width);
>     os.clear (std::ios_base::failbit);
>     os << str;
>     assert (os.width () == width);
>     return 0;
> }

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