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c++/3282: Problems with throw and destuctor callings
- To: gcc-gnats at gcc dot gnu dot org
- Subject: c++/3282: Problems with throw and destuctor callings
- From: Bohdan Vlasyuk <bohdan at kivc dot vstu dot vinnica dot ua>
- Date: Wed, 20 Jun 2001 11:17:44 +0300
>Number: 3282
>Category: c++
>Synopsis: Problems with throw and destuctor callings
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: wrong-code
>Submitter-Id: net
>Arrival-Date: Wed Jun 20 01:26:00 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator: Bohdan Vlasyuk
>Release: 3.0
>Organization:
VSTU
>Environment:
System: Linux kivc.vstu.vinnica.ua 2.4.5 #12 ÷ÔÒ þÅÒ 19 10:01:01 EEST 2001 i686 unknown
Architecture: i686
host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: i686-pc-linux-gnu
configured with: ../srcdir/configure --enable-threads --enable-languages=c,c++ --disable-libgcj
>Description:
When I want to throw class, which has other class inside, and
constructor copies some properties of given class -- it look like
destructors are called wrond. I guess code will explain it better:
--------------------------------------
#include <iostream.h>
int global;
class One {
public:
int num;
One() { num=++global; cout << "One " <<num<<endl; };
void Copy(One second_one) { cout << "Copy " <<num<<endl; };
~One() { cout << "~One "<<num<<endl; };
};
class Two {
public:
One my_one;
Two(One one) { my_one.Copy(one); };
};
int main()
{
One a;
try {
throw Two(a);
} catch (Two two) {
cout << "Ok"<<endl;
}
return 0;
}
--------------------------------------
It produces following output:
( g++ _test.cpp -o test )
11:12:39 ~/src/eval/src # ./test
One 1
One 2
Copy 2
~One 1
~One 1
~One 1
~One 1
~One 2
Ok
~One 2
~One 2
~One 1
You see, each destructor is called way more tnat once.
P.s.: It work in a same way with 2.95.3
As a side note: 3.0's g++ appears to be MUCH MUCH slower than 2.95.3
>How-To-Repeat:
Preprocessed file is ~600kb large.
Just take file from the above, and compile it with
g++ _test.cpp -o test
>Fix:
No ideas.
>Release-Note:
>Audit-Trail:
>Unformatted: