Wrappers and iterators examples

Build and run:

make

raw_ptr.cc

Simply raw pointer wrapper. Shows how we can do an object abilities extension in the runtime. Useful for iterators.

smart_ptr.cc

Similar example, but holds the shared pointer.

iterable.cc

Finally, the iterable with traversing algorithm compile-time instantiated. The template method returns an iterable object, which iterates over IShape's with its .get_next()/.get_prev().