std::tr1::function

[Alex Chen]

I have some code that uses std::tr1::function template. When I compile 
it on Ubuntu 13.04 with g++ 4:4.7.3-1ubuntu10 package, I get the 
following error: 'function’ in namespace ‘std::tr1’ does not name a 
type. If I change to use std::function, it still fails with similar error.

Any help is appreciated.

Thanks
Alex