[Bug c++/54509] If Move constructor is templatized then it is invoked else not

[daniel.kruegler at googlemail dot com]

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.