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* [Bug c++/54509] New: If Move constructor is templatized then it is invoked else not
@ 2012-09-06 20:10 rsdevgun at gmail dot com
2012-09-07 5:38 ` [Bug c++/54509] " daniel.kruegler at googlemail dot com
2012-09-07 8:31 ` redi at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: rsdevgun at gmail dot com @ 2012-09-06 20:10 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54509
Bug #: 54509
Summary: If Move constructor is templatized then it is invoked
else not
Classification: Unclassified
Product: gcc
Version: 4.7.1
Status: UNCONFIRMED
Severity: major
Priority: P3
Component: c++
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: rsdevgun@gmail.com
#include <iostream>
#include <string>
using namespace std;
// uncomment to see the bug with 4.7.1 and 4.8.0
#define _BUG_
struct Test
{
Test() = default;
Test(const Test & )
{
cout << "ctor overload 1 & " << endl;
}
#ifdef _BUG_
template<typename T>
Test(T && )
{
//T* t = "0"; // For intentional error
cout << "ctor template version overload 2 && " << endl;
}
#else
Test(Test && )
{
cout << "ctor specialized overload 2 && " << endl;
}
#endif
};
int main()
{
Test t1( []()-> Test { return Test();}() );
return 0;
}
I expect Test(Test && ) to be invokved (without template version).
Also if you uncommment //T* t = "0"; -> you will see that data type is not a
magical data type, Being same as class itself, behavior is wrong.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/54509] If Move constructor is templatized then it is invoked else not
2012-09-06 20:10 [Bug c++/54509] New: If Move constructor is templatized then it is invoked else not rsdevgun at gmail dot com
@ 2012-09-07 5:38 ` daniel.kruegler at googlemail dot com
2012-09-07 8:31 ` redi at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: daniel.kruegler at googlemail dot com @ 2012-09-07 5:38 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54509
Daniel Krügler <daniel.kruegler at googlemail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |daniel.kruegler at
| |googlemail dot com
--- Comment #1 from Daniel Krügler <daniel.kruegler at googlemail dot com> 2012-09-07 05:37:56 UTC ---
The language requires that the presence of a user-declared copy-constructor
(which you have used in your code) shall prevent the compiler-declared move
constructor. When _BUG_ is defined, the effect is that the class has a copy
constructor and a template constructor
template<typename T>
Test(T &&);
but *no* move constructor. The template constructor will always be a better
match for rvalue arguments than the copy constructor, therefore it is called
twice in your program.
In other words: The behavior of gcc looks correct and this report seems invalid
to me.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/54509] If Move constructor is templatized then it is invoked else not
2012-09-06 20:10 [Bug c++/54509] New: If Move constructor is templatized then it is invoked else not rsdevgun at gmail dot com
2012-09-07 5:38 ` [Bug c++/54509] " daniel.kruegler at googlemail dot com
@ 2012-09-07 8:31 ` redi at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: redi at gcc dot gnu.org @ 2012-09-07 8:31 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54509
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution| |INVALID
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-09-07 08:31:25 UTC ---
as Daniel said
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2012-09-07 8:31 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2012-09-06 20:10 [Bug c++/54509] New: If Move constructor is templatized then it is invoked else not rsdevgun at gmail dot com
2012-09-07 5:38 ` [Bug c++/54509] " daniel.kruegler at googlemail dot com
2012-09-07 8:31 ` redi at gcc dot gnu.org
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