[Bug c++/50285] no known conversion for argument 1: 'X' to 'X'

2011-10-10 Thread manu at gcc dot gnu.org 
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50285

Manuel López-Ibáñez manu at gcc dot gnu.org changed:

   What|Removed |Added

 Status|WAITING |RESOLVED
 CC||manu at gcc dot gnu.org
 Resolution||INVALID

--- Comment #2 from Manuel López-Ibáñez manu at gcc dot gnu.org 2011-10-10 
12:00:07 UTC ---
I don't get why this is WAITING, if you have suggestions on how to improve the
diagnostic, please REOPEN. Otherwise this is not a bug.

Clang prints something similar:

/tmp/webcompile/_26316_0.cc:11:5: error: no viable overloaded '='
  x = f();
  ~ ^ ~~~
/tmp/webcompile/_26316_0.cc:3:6: note: candidate function not viable: no known
conversion from 'X' to 'X ' for 1st argument
  X operator=(X);
 ^
1 error generated.

[Bug c++/50285] no known conversion for argument 1: 'X' to 'X'

2011-10-10 Thread redi at gcc dot gnu.org 
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50285

--- Comment #3 from Jonathan Wakely redi at gcc dot gnu.org 2011-10-10 
12:15:44 UTC ---
(In reply to comment #2)
 I don't get why this is WAITING

Really?  The OP never provided any source that demonstrates the bug so I
couldn't be sure if my guess was right or if they found a real bug.  When an
incomplete bug report is submitted the usual response is to request more
details and set WAITING.

As feedback has not been forthcoming I agree with closing it.

[Bug c++/50285] no known conversion for argument 1: 'X' to 'X'

2011-09-04 Thread redi at gcc dot gnu.org 
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50285

Jonathan Wakely redi at gcc dot gnu.org changed:

   What|Removed |Added

 Status|UNCONFIRMED |WAITING
   Last reconfirmed||2011-09-04
 Ever Confirmed|0   |1

--- Comment #1 from Jonathan Wakely redi at gcc dot gnu.org 2011-09-04 
18:06:54 UTC ---
An error message is not a bug, please follow the bug reporting instructions and
provide source code for a testcase demonstrating your problem:
http://gcc.gnu.org/bugs/

The message clearly isn't about converting a type to  itself, it's about
converting a type to a non-const lvalue reference to that type (X is not the
same as X)

I assume it means you're trying to pass an rvalue (e.g. a temporary) to a
function that requires an lvalue

e.g. this produces a similar error

struct X {
  X operator=(X);
};

X f();

void g()
{
  X x;
  x = f();
}