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and subject line Bug#295073: g++-3.3: operator new doesn't initialize memory
anymore after thrown exception
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From: "Frank B. Brokken" <[EMAIL PROTECTED]>
To: Debian Bug Tracking System <[EMAIL PROTECTED]>
Subject: g++-3.3: operator new doesn't initialize memory anymore after thrown
exception
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Date: Sun, 13 Feb 2005 14:25:05 +0100
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Package: g++-3.3
Version: 1:3.3.5-5
Severity: normal
Dear g++ maintainer,
When running the following little program it appears that operator new fails
to initialize the memory it allocates. For example, when I run the program I
get the following output:
134517800 0 1074470752 1074986304 0 1 1 134517181 134517168 134515206
The program was compiled using both a plain `g++' command and `g++ -Wall
-fexceptions'. No warnings are reported and compilation proceeds flawlessly.
Here is the program;
------------------------------------------------
#include <iostream>
#include <iterator>
#include <algorithm>
using namespace std;
void showalloc()
{
int *ip = new int [10];
copy(ip, ip + 10, ostream_iterator<int>(cerr, " "));
cout << endl;
delete [] ip;
}
void thrower()
{
try
{
throw 0; // remove this to obtain memory initialized to 0
}
catch(...)
{}
}
int main()
{
thrower();
showalloc();
return 0;
}
------------------------------------------------
When the `throw 0;' statement is removed the memory comes out neatly
initialized. The program's output in that case is:
0 0 0 0 0 0 0 0 0 0
Kind regards,
Frank B. Brokken
-- System Information:
Debian Release: 3.1
APT prefers testing
APT policy: (500, 'testing')
Architecture: i386 (i686)
Kernel: Linux 2.6.8.1
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)
Versions of packages g++-3.3 depends on:
ii gcc-3.3 1:3.3.5-5 The GNU C compiler
ii gcc-3.3-base 1:3.3.5-5 The GNU Compiler Collection (base
ii libc6 2.3.2.ds1-20 GNU C Library: Shared libraries an
ii libstdc++5-3.3-dev 1:3.3.5-5 The GNU Standard C++ Library v3 (d
-- no debconf information
---------------------------------------
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To: [EMAIL PROTECTED]
Subject: Re: Bug#295073: g++-3.3: operator new doesn't initialize memory
anymore after thrown exception
References: <[EMAIL PROTECTED]>
From: Falk Hueffner <[EMAIL PROTECTED]>
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Date: Sun, 13 Feb 2005 14:55:24 +0100
In-Reply-To: <[EMAIL PROTECTED]> (Frank B.
Brokken's message of "Sun, 13 Feb 2005 14:25:05 +0100")
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"Frank B. Brokken" <[EMAIL PROTECTED]> writes:
> When running the following little program it appears that operator
> new fails to initialize the memory it allocates.
That's as expected, "new" for POD types does not initialize the data
(5.3.4/15).
--
Falk
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