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and subject line Bug#171561: g++-3.2: iostream does not work
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From: Francesco Potorti` <[EMAIL PROTECTED]>
To: Debian Bug Tracking System <[EMAIL PROTECTED]>
Subject: g++-3.2: iostream does not work
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Package: g++-3.2
Version: 1:3.2.1-0pre3
Severity: normal
Sorry if this is not a bug, but I cannot find any way why it isn't. I
cannot make iostream work. The appended short program compiles (and
works) okay with g++-2.95, but does not compile with either 3.0 or 3.2
(against which this report is sent). The error messages are:
g++-3.2 bin2a.cc -o bin2a
bin2a.cc: In function `int main(int, char**)':
bin2a.cc:9: `cerr' undeclared (first use this function)
bin2a.cc:9: (Each undeclared identifier is reported only once for each function
it appears in.)
bin2a.cc:10: `ifstream' undeclared (first use this function)
bin2a.cc:10: parse error before `(' token
bin2a.cc:12: `f' undeclared (first use this function)
bin2a.cc:13: `cout' undeclared (first use this function)
make: *** [bin2a] Error 1
-- System Information
Debian Release: testing/unstable
Kernel Version: Linux pot.cnuce.cnr.it 2.4.18 #2 Mon Jul 29 12:21:48 CEST 2002
i686 Pentium II (Deschutes) GenuineIntel GNU/Linux
Versions of the packages g++-3.2 depends on:
ii gcc-3.2 3.2.1-0pre3 The GNU C compiler.
ii gcc-3.2-base 3.2.1-0pre3 The GNU Compiler Collection (base package).
ii libc6 2.2.5-14.3 GNU C Library: Shared libraries and Timezone
ii libstdc++5-dev 3.2.1-0pre3 The GNU stdc++ library version 3 (developmen
===File /tmp/bin2a.cc=======================================
#include <iostream>
#include <fstream>
// Leggi da file in binario e scrivi su standard input in ascii
int
main (int argc, char *argv[])
{
if (argc != 2)
{ cerr << "Un argomento richiesto: nome del file di ingresso\n"; exit (1); }
ifstream f (argv[1], ios::bin|ios::in);
double x;
while (f.read(&x, sizeof(x)))
cout << x << '\n';
return 0;
}
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Date: Tue, 3 Dec 2002 06:59:46 -0500
Subject: Re: Bug#171561: g++-3.2: iostream does not work
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To: Francesco Potorti` <[EMAIL PROTECTED]>,
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On Tuesday, December 3, 2002, at 05:16 AM, Francesco Potorti` wrote:
>
> Sorry if this is not a bug, but I cannot find any way why it isn't.
This is due to a rather old change in the C++ standard. I think it was
between the second and third edition of the Stroustrup book, but I
could be mistaken.
The C++ standard library lives in the "std" namespace. So you must
either write:
std::cerr << "Whatever";
or "using namespace std::cerr" or "using namespace std"
You just saw this because gcc-2.95 did not have proper namespace
support.
