c++/9946: destructor is not called for temporary object
vasilche@ncbi.nlm.nih.gov
vasilche@ncbi.nlm.nih.gov
Tue Mar 4 20:26:00 GMT 2003
>Number: 9946
>Category: c++
>Synopsis: destructor is not called for temporary object
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Tue Mar 04 20:26:01 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator: vasilche@ncbi.nlm.nih.gov
>Release: gcc-3.2.2
>Organization:
>Environment:
Linux linus 2.4.17-aa #6 SMP Thu Jan 3 17:53:55 EST 2002 i686 unknown
>Description:
If expression of type 'const C' (not const reference) is passed to function accepting 'C' by value, gcc 3.2.0-3.2.2 doesn't call destructor for temporary argument object.
---- The code destr.cpp:
#include <iostream>
struct C
{
C(void) { std::cerr << this << "->C()\n"; }
C(const C& c) { std::cerr << this << "->C(" << &c << ")\n"; }
~C(void) { std::cerr << this << "->~C()\n"; }
};
struct C2
{
const C get(void) const { return c; }
void go(C c) {}
C c;
};
int main()
{
C2 c2;
c2.go(c2.get());
}
---- Command line:
# g++ -O0 -o destr destr.cpp
---- Output:
~/tmp# ./destr
0xbffff604->C()
0xbffff5f4->C(0xbffff604)
0xbffff604->~C()
~/tmp#
>How-To-Repeat:
Returned object value should be const.
Argument should be object by value.
Compilation should be without optimization.
With optimization turned on all destructors are called correctly.
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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