state machine

Question

C++ / C#

Something I “stuck” thinking about a beautiful and elegant solution for working with a finite state machine (essentially no frills, because for MK :)

switch-case - understandable, but I want a more beautiful one :)

here - I’m thinking about something like this :
www.chipenable.ru/index.php/programming-c/90--state-machine.html

nightmares from templates:
www.rsdn.ru/article/alg/FiniteStateMachine.xml
www.rsdn.ru/article/alg/ Static_Finite_State_Machine.xml

any ideas? :)
Thanks!

Answer 1

These articles have all the ways that I saw on the pros (well, there are slightly more perversions with templates).
I think that for a small automaton (<5 states) there is nothing better than switch or goto, if more then I use State / Strategy.
Speaking of goto, there is another way, a hybrid one. Essentially goto + functions per action/event and jump between functions with setjmp/longjmp, but that's more for C than for C++.
Are you looking for something specific? :) It's just not entirely clear what has grown.

Answer 2

macros are often written for convenience.
for example, Alexey Pakhunov has an example on his blog from his colleague.

Answer 3

Just one step further from a simple switch-case in the direction of elegance, in my opinion, is the design of state transitions in the form of a table, like here: stackoverflow.com/a/1647679/1501359 .