From: Chad Perrin <perrin@...>
Date: 2008-10-15T03:38:58+09:00
Subject: Re: Sample for Metaprogramming

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On Sun, Oct 12, 2008 at 02:35:34AM +0900, Sebastian Hungerecker wrote:
> relzne@bluewin.ch wrote:
> > Can anyone give me a good small sample for Metapgramming with Ruby?
>=20
> There you go:

[snip]

>=20
> Ok, this took way more time to write than I expected and also turned out =
quite=20
> a bit bigger and isn't really tested very thoroughly. But the idea is a s=
uch:
>=20
> Using Files.in(dirname) you can get a class representing that directory.
> This class will have a method for every file in that directory.
> Calling such a method will give you an instance of the class, representin=
g the=20
> specific file.
> Calling new(filename) on the class will create a file in that directory.
> The class is extended with Enumerable and you can use it to iterate over =
its=20
> instances representing the files that exist the directory.
>=20
> Of course this is quite a complicated way to work with files, but you wan=
ted=20
> meta-programming, so there you go.
> (I did intend this to be simpler than it turned out to be, though)

Is there anyone here that knows Lisp well enough to provide a Lisp
example that does the same thing, just for purposes of comparing how the
two languages handle these techniques?

--=20
Chad Perrin [ content licensed PDL: http://pdl.apotheon.org ]
H. L. Mencken: "In this world of sin and sorrow, there is always
something to be thankful for; as for me, I rejoice that I am not a
Republican."

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