On 5 December 2014 at 02:31, Yu Sheng Oh wrote: > HI, > > I have a piece of code at http://goo.gl/r2ySE6 > > Refer to the code, with option of "-O2 -std=c++1y", when we comment > out the statement "id<int>;" clang-3.4.1 compiles the code > successfully, but g++-4.9.0 compiles failed, where g++ complains that > "unresolved overloaded function type", which in turn implies that at > the point of calling compose function, id<int> is not instantiated. It does seem to be a bug, but I don't think the problem is that the function isn't instantiated. I think the compiler is failing to deduce the return type of id<int>, because it works if you change it to not use "auto" as the return type. I've reported it to Bugzilla as https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59912 with a simpler example, thanks for reporting it to us.
