[boost] [GIL] runtime assertion error

Hello, I was playing with GIL a little and started out with the tutorial. After adapting it a bit I noticed a runtime assertion error here in color_base.hpp +343: template typename element_reference_type

::type dynamic_at_c(homogeneous_color_base& cb, std::size_t i) { assert(i(&cb))[i]; }

The example works if I compile in release but I still wanted to bring it up because of an extensive comment above this template that states that this assertion checks for compiler specific behavior and mentions flags that need to be set but not which flags. I believe there might be a bug there. Also, since it's the tutorial, I suppose it should work under most circumstances. I have a sample of the code attached. It's gcc 4.8 here in Linux 64. Nothing fancy. Boost 1.56. Cheers, Stephan