[Bug c++/57610] Reference initialized with temporary instead of sub-object of conversion result

[o_kniemeyer at maxon dot net]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57610

Ole Kniemeyer <o_kniemeyer at maxon dot net> changed:

           What    |Removed                     |Added
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             Status|RESOLVED                    |UNCONFIRMED
         Resolution|INVALID                     |---

--- Comment #3 from Ole Kniemeyer <o_kniemeyer at maxon dot net> ---
In the example X can be converted to B which is a derived class of A. When an A
reference is initialized with an X object, the result of the X::operator B()
should be used directly for the A reference, but GCC creates a temporary A
object and initializes this by copy-construction from the conversion result.

At least if the classes use virtual functions, this leads to wrong results.