OpenEuphoria

Re: Call for Opinions

• Posted by Vincent <darkvincentdude at yahoo.com> May 20, 2005
• 547 views

Juergen Luethje wrote:
> 
> Matt Lewis wrote:
> 
> > Juergen Luethje wrote:
> 
> <snip>
> 
> >> BTW: I believe we can use OOEU as procedural language if we want,
> >>      without using any OOP, and just use the other features.
> >>      Is this right?
> >>
> >
> > Yes.  In fact (and partially in response to your matrix), you could use
> > the OO features as structures (both in the logical and machine dependent,
> > c-structures).  Here's the start of a lib (and a simple demo) for doing
> > that:
> 
> Cool! Thanks.
> Although I maybe slowly get a "feeling" for OOP, I wonder whether I ever
> will actually understand it ...
> 
> > }}}
<eucode>
> > -----------------------------------------------------
> > -- begin cstructs.e
> > -- Structure library for OOEU
> > include machine.e
> >
> > global euclass Byte( integer b )
> > 	procedure Store( atom ptr )
> > 		poke( ptr, this )
>                            ^^^^
> ... for instance, what does "this" mean.
> I also saw it in OOEU example programs, but couldn't find an explanation.
> 
> <snip>
> 
> > ----------------------------------------------------------
> > -- begin struct.ex
> > include cstructs.e
> >
> > euclass MyStruct( CStruct s )
> >     Long a_long
> >     Lpsz a_string
> >
> >     procedure Poke()
> >         atom ptr
> >         ptr = this.ptr
> >         this.a_long.Store( ptr )
> >         ptr += this.a_long.sizeof()
> >         this.a_string.Store( ptr )
> >     end procedure
> >
> >     function Peek()
> >         atom ptr
> >         ptr = this.ptr
> >         this.a_long = this.a_long.Fetch( ptr )
> >         ptr += this.a_long.sizeof()
> >         this.a_string = this.a_string.Fetch( this.ptr )
> >         return this
> >     end function
> >
> >     procedure New( atom l, sequence str )
> >         this = repeat( 0, MyStruct.a_string )
> >         this.size = Long.size + Lpsz.size
> >         this.ptr = this.Alloc()
> >         this.a_long = l
> >         this.a_string = str
> >         this.Poke()
> >     end procedure
> > end euclass
> >
> > MyStruct struct
> >
> > struct = MyStruct.New( 0, 0, "Hello, World" )
> 
> Another point that I don't understand:
> 'MyStruct.New()' is declared with 2 parameters, but here you call it
> with 3 parameters ...
> 
> > struct.Poke()
> > ? struct
> > ? peek( struct )
> > poke4u( struct.ptr, 1 )
> > struct = struct.Peek()
> > ? struct
> >
> > -- end struct.ex
> > ---------------------------------------
> <font color="#330033">> </eucode>
{{{
</font>
> 
> Thanks in advance for some help. 
> Regards,
>    Juergen
> 
> 

The structure library that I include with VEEU, can work on any 100% campatable
Euphoria interpreters.. And it also offers full support for C/C++ unions, arrays,
and all types. I had to modify it to work standalone without Chris's Empire
framework, plus did some other modifications & optimizations.

I'm planning on a binder/shrouder program.. and possibly an IL dissasembler for
the next release. Matt's interpreter has an GUI based trace screen module, that
is really cool. My next release will also have a better versioning system. Right
now it is just v2.5 (like Euphoria :P).

Regards,
Vincent

--
Without walls and fences, there is no need for Windows and Gates.