"Alexander Nasonov" <alnsn@yandex.ru> writes:
David Abrahams wrote:
I'll ask again: what is the point of using types for states?
You can't easily emulate is-a relationship with numbers. With classes you just derive one class from another.
Okay, but what's the value of modeling an is-a relationship between states? In a FSM, states are distinct. One state is-not-a nother state.
My example demonstrates this technique.
AFAICT it seems to be a way of grouping states, or perhaps of emulating substates, so you can avoid writing the transitions that a group of states has in common (?)
I don't know if I do so, yet ;-)
I mean I _can_ do so but switching to mpl concept doesn't go smoothly. Currently, I'm trying to understand why size of mpl::set<id<1>, id<2> > is 2 while distance between begin and end is one?
I'm lost, sorry. -- Dave Abrahams Boost Consulting www.boost-consulting.com