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* [Bug c++/15284] New: Access check on not-used copy-constructor
@ 2004-05-04 19:02 carlo at gcc dot gnu dot org
2004-05-04 19:38 ` [Bug c++/15284] " pinskia at gcc dot gnu dot org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: carlo at gcc dot gnu dot org @ 2004-05-04 19:02 UTC (permalink / raw)
To: gcc-bugs
Setting a copy constructor private is a well-known
way to make sure that it never is copied. This usually
works fine - except in this case:
#include <iostream>
class A {
#ifdef COMPILEBUG
private:
#else
public:
#endif
A(A const&)
{
std::cout << "Copy constructor is actually being used (called)!" << std::endl;
}
public:
A(int)
{
std::cout << "Calling A(int)" << std::endl;
}
};
A f()
{
return A(1);
}
int main()
{
A a = f();
}
If you compile this without defining COMPILEBUG - then
it compiles fine of course. And the output shows that
the copy constructor of A is never called!
>g++-cvs-3.5 test.cc
>a.out
Calling A(int)
Because the copy constructor is never called - one would
expect that it is ok to make it private; however:
>g++-cvs-3.5 -DCOMPILEBUG test.cc
test.cc: In function `A f()':
test.cc:10: error: `A::A(constA&)' is private
test.cc:22: error: within this context
test.cc:10: error: `A::A(constA&)' is private
test.cc:22: error: within this context
test.cc: In function `int main()':
test.cc:10: error: `A::A(constA&)' is private
test.cc:27: error: within this context
test.cc:10: error: `A::A(constA&)' is private
test.cc:27: error: within this context
The same behaviour is seen with all versions down to 2.95.2.
--
Summary: Access check on not-used copy-constructor
Product: gcc
Version: 3.5.0
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: carlo at gcc dot gnu dot org
CC: gcc-bugs at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15284
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/15284] Access check on not-used copy-constructor
2004-05-04 19:02 [Bug c++/15284] New: Access check on not-used copy-constructor carlo at gcc dot gnu dot org
@ 2004-05-04 19:38 ` pinskia at gcc dot gnu dot org
2004-08-27 8:51 ` pinskia at gcc dot gnu dot org
2004-08-27 8:51 ` pinskia at gcc dot gnu dot org
2 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-05-04 19:38 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-05-04 19:38 -------
The copy constructor is need to be accessible even though it is not being called for this case.
See <http://gcc.gnu.org/bugs.html#cxx_rvalbind> and the reference standard sections.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution| |INVALID
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15284
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/15284] Access check on not-used copy-constructor
2004-05-04 19:02 [Bug c++/15284] New: Access check on not-used copy-constructor carlo at gcc dot gnu dot org
2004-05-04 19:38 ` [Bug c++/15284] " pinskia at gcc dot gnu dot org
2004-08-27 8:51 ` pinskia at gcc dot gnu dot org
@ 2004-08-27 8:51 ` pinskia at gcc dot gnu dot org
2 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-08-27 8:51 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-08-27 08:51 -------
Reopening bug to mark as a dup of ...
--
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |UNCONFIRMED
Resolution|INVALID |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15284
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/15284] Access check on not-used copy-constructor
2004-05-04 19:02 [Bug c++/15284] New: Access check on not-used copy-constructor carlo at gcc dot gnu dot org
2004-05-04 19:38 ` [Bug c++/15284] " pinskia at gcc dot gnu dot org
@ 2004-08-27 8:51 ` pinskia at gcc dot gnu dot org
2004-08-27 8:51 ` pinskia at gcc dot gnu dot org
2 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-08-27 8:51 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-08-27 08:51 -------
bug 12226.
*** This bug has been marked as a duplicate of 12226 ***
--
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution| |DUPLICATE
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15284
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2004-08-27 8:51 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2004-05-04 19:02 [Bug c++/15284] New: Access check on not-used copy-constructor carlo at gcc dot gnu dot org
2004-05-04 19:38 ` [Bug c++/15284] " pinskia at gcc dot gnu dot org
2004-08-27 8:51 ` pinskia at gcc dot gnu dot org
2004-08-27 8:51 ` pinskia at gcc dot gnu dot org
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