Re: [Boost-users] Sequence of Types, What For?

From: Aleksey Gurtovoy (agurtovoy_at_[hidden])
Date: 2006-11-14 02:22:25

David Abrahams writes:
> "Terry G" <tjgolubi_at_[hidden]> writes:
> 
> >>> BTW, on the boost website, there are three versions of the FSM player
> >>> example.
> >> Where?
> >
> > Its in the Boost 1.33.1 download from the website, in 
> > boost/libs/mpl/example/fsm.
> > I have the book CD too, of course.  Which is "best"?
> 
> Oh, crud.  We should have included a README file there, and I hope
> Aleksey will help me get this sorted out so I can write one.
> 
> Here's what I think:
> 
> player1.cpp - this is exactly what's covered in the book; in fact, it
>    was auto-extracted from the examples as shown in the book.

Yep.

> player2.cpp - this example demonstrates that the abstraction of the
>    framework is complete by replacing its implementation with one that
>    dispatches using O(1) table lookups, while still using the same
>    code to describe the particular FSM.  Look at this one if you want
>    to see how to generate a static lookup table that's initialized at
>    dynamic initialization time.

Correct.

> player.cpp, state_machine.hpp - this is something Aleksey wrote.  I'm
>    not sure, but I think it predates the book, 

It does.

>    and is more sophisticated in some ways

In particular, it supports state invariants and maintains an internal
event queue.

>    but probably should be treated as an advanced example.

Yep.

-- 
Aleksey Gurtovoy
MetaCommunications Engineering