Re: c++/9215: Problem with reserting a stream to default using setf

Re: c++/9215: Problem with reserting a stream to default using setf

[paolo]

Synopsis: Problem with reserting a stream to default using setf

Responsible-Changed-From-To: unassigned->paolo
Responsible-Changed-By: paolo
Responsible-Changed-When: Tue Jan  7 04:48:30 2003
Responsible-Changed-Why:
    Analyzed.
State-Changed-From-To: open->feedback
State-Changed-By: paolo
State-Changed-When: Tue Jan  7 04:48:30 2003
State-Changed-Why:
    Basing on the ISO standard, what you are trying to do is not
    portable across different implementations. On the contrary
    
      cout.setf(ios_base::floatfield, ios_base::floatfield);
    
    it is and works for me.
    Works for you?
    Thanks, Paolo.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9215

Re: c++/9215: Problem with reserting a stream to default using setf

[Paolo Carlini]

The following reply was made to PR libstdc++/9215; it has been noted by GNATS.

From: Paolo Carlini <pcarlini@unitus.it>
To: Jon Gjerde <Jon.Gjerde@nr.no>
Cc: paolo@gcc.gnu.org,  gcc-bugs@gcc.gnu.org,  gcc-prs@gcc.gnu.org, 
 nobody@gcc.gnu.org,  gcc-gnats@gcc.gnu.org
Subject: Re: c++/9215: Problem with reserting a stream to default using setf
Date: Tue, 07 Jan 2003 17:20:57 +0100

 Jon Gjerde wrote:
 
 >Thank you for the quick reply.
 >
 >Is your solution cout.setf(ios_base::floatfield, ios_base::floatfield) equal
 >to unsetf(ios_base::floatfield)?
 >
 Yes. An alternate solution would be
 
   cout.setf(ios_base::fmtflags(0), ios_base::floatfield)
 
 >I am now using the latter, and it seems to
 >do the same as setf(0, ios_base::floatfield) when using the Sun CC compiler.
 >Btw, the setf(0, ios_base::floatfield) statement is taken from an example in
 >The C++ Programming language by Bjarne Stroustrup.
 >
 ;)
 
 Well, I may be wrong, but in the _final_ standard I cannot find examples 
 of a 'plain' 0 but always ios_base::fmtflags(0). Otherwise, make use of 
 what I replied earlier today.
 
 Barring any additional clarification on the '0' vs ios_base::fmtflags(0) 
 issue, I would close the PR.
 
 Ciao, Paolo.
 
 http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9215
 
 

Re: c++/9215: Problem with reserting a stream to default using setf

[Jon Gjerde]

The following reply was made to PR libstdc++/9215; it has been noted by GNATS.

From: "Jon Gjerde" <Jon.Gjerde@nr.no>
To: <paolo@gcc.gnu.org>, <gcc-bugs@gcc.gnu.org>, <gcc-prs@gcc.gnu.org>,
        <jon.gjerde@nr.no>, <nobody@gcc.gnu.org>, <gcc-gnats@gcc.gnu.org>
Cc:  
Subject: Re: c++/9215: Problem with reserting a stream to default using setf
Date: Tue, 7 Jan 2003 14:29:07 +0100

 ----- Original Message -----
 From: <paolo@gcc.gnu.org>
 To: <gcc-bugs@gcc.gnu.org>; <gcc-prs@gcc.gnu.org>; <jon.gjerde@nr.no>;
 <nobody@gcc.gnu.org>; <paolo@gcc.gnu.org>
 Sent: Tuesday, January 07, 2003 1:48 PM
 Subject: Re: c++/9215: Problem with reserting a stream to default using setf
 
 
 > Synopsis: Problem with reserting a stream to default using setf
 >
 > Responsible-Changed-From-To: unassigned->paolo
 > Responsible-Changed-By: paolo
 > Responsible-Changed-When: Tue Jan  7 04:48:30 2003
 > Responsible-Changed-Why:
 >     Analyzed.
 > State-Changed-From-To: open->feedback
 > State-Changed-By: paolo
 > State-Changed-When: Tue Jan  7 04:48:30 2003
 > State-Changed-Why:
 >     Basing on the ISO standard, what you are trying to do is not
 >     portable across different implementations. On the contrary
 >
 >       cout.setf(ios_base::floatfield, ios_base::floatfield);
 >
 >     it is and works for me.
 >     Works for you?
 >     Thanks, Paolo.
 >
 >
 http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&p
 r=9215
 >
 
 Thank you for the quick reply.
 
 Is your solution cout.setf(ios_base::floatfield, ios_base::floatfield) equal
 to unsetf(ios_base::floatfield)? I am now using the latter, and it seems to
 do the same as setf(0, ios_base::floatfield) when using the Sun CC compiler.
 Btw, the setf(0, ios_base::floatfield) statement is taken from an example in
 The C++ Programming language by Bjarne Stroustrup.
 
 Yours, Jon Gjerde
 
 

c++/9215: Problem with reserting a stream to default using setf

[jon.gjerde]

>Number:         9215
>Category:       c++
>Synopsis:       Problem with reserting a stream to default using setf
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    unassigned
>State:          open
>Class:          rejects-legal
>Submitter-Id:   net
>Arrival-Date:   Tue Jan 07 01:56:00 PST 2003
>Closed-Date:
>Last-Modified:
>Originator:     Jon Gjerde
>Release:        gcc version 3.1.1
>Organization:
>Environment:
SunOS lyra 5.8 Generic_108528-12 sun4u sparc SUNW,Sun-Fire-280R
/local/gcc3.1.1/bin/g++ -v
Reading specs from /local/gcc3.1.1/lib/gcc-lib/sparc-sun-solaris2.8/3.1.1/specs
Configured with: ./configure --prefix=/local/gcc3.1.1
Thread model: posix
>Description:
stream.C: In function `int main()':
stream.C:15: invalid conversion from `int' to `std::_Ios_Fmtflags'
stream.C:15:   initializing argument 1 of `std::_Ios_Fmtflags 
   std::ios_base::setf(std::_Ios_Fmtflags, std::_Ios_Fmtflags)'
>How-To-Repeat:
Compile the following:
--- Begin Source ---
#include <iostream>
#include <fstream>

using std::cout;
using std::endl;
using std::ios_base;

int main()
{
   double a = 1234.56789;

   cout << a << endl;
   cout.setf(ios_base::scientific, ios_base::floatfield);
   cout << a << endl;
   cout.setf(0, ios_base::floatfield);  // Return to default output
   cout << a << endl;
}
--- End source ---
>Fix:
Use the cc: Sun WorkShop 6 update 1 compiler :-)
>Release-Note:
>Audit-Trail:
>Unformatted: