shunsuke wrote:
Sergey Shandar wrote:
References work on gcc-3.4.5 (mingw-special). I have not tried 4.X.X. See the test: http://tools.assembla.com/cbear/browser/trunk/cbear.berlios.de/cast/test.cpp.
What's wrong with GCC?
You've found that workaround. :-)
Only now. The first two workarounds were not really workarounds. 1. This one is unsafe to use. operator MyClass const &() const { return *this; } In case: MyClass const &x = MyClass(); 2. This one is not really fixing the problem. MyClass const t = MyClass(); MyClass const &x = t; 3. I found this one today: template<class T> operator T &() const throw(typename ::boost::disable_if< ::boost::is_same<T, MyClass const> >::type *)
Yes, gcc requires a named return value.
Yes, it tries to use user-defined conversion when converts rvalue to a reference on a constant. I've sent a bug report http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34023
Well, my library contains function adaptors. While adapting, here's what happens internally:
template<class X> X const & pass_through_some_adaptor(X const & x) { return x; }
D & d = pass_through_some_adaptor(polymorphic_down::ref(b)); // doesn't compile on gcc. Therefore, I gave up.
Try workaround # 3. It may help. Best regards, Sergey Shandar.