From: "Shot (Piotr Szotkowski)" <shot@...>
Date: 2009-08-27T07:32:33+09:00
Subject: Re: operators vs. methods

--IS0zKkzwUGydFO0o
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable

Brian Candler:

> (2) !~ and !=3D operators do not map directly to method
> calls, but call :=3D~ and :=3D=3D and negate the answers

> >> class Foo; def =3D=3D(bar); puts "=3D=3D #{bar}"; end; end
> =3D> nil
> >> Foo.new =3D=3D "x"
> =3D=3D x
> =3D> nil
> >> Foo.new !=3D "x"
> =3D=3D x
> =3D> true

That is true in MRI 1.8, but not in MRI 1.9, where !=3D can be
specified (but does fall back to a negated =3D=3D if missing):

>> class Foo; def =3D=3D(bar); puts "=3D=3D #{bar}"; end; end
=3D> nil
>> Foo.new =3D=3D "x"
=3D=3D x
=3D> nil
>> Foo.new !=3D "x"
=3D=3D x
=3D> true
>> class Foo; def !=3D(bar); puts "nooo, I=E2=80=99m not a negated =3D=3D!"=
; end; end
=3D> nil
>> Foo.new !=3D 'x'
nooo, I=E2=80=99m not a negated =3D=3D!
=3D> nil
>> Foo.new =3D=3D 'x'
=3D=3D x
=3D> nil

=E2=80=94 Shot
--=20
For some reason, this signature reminds everyone of Marvin Zelkowitz.

--IS0zKkzwUGydFO0o
Content-Type: application/pgp-signature; name="signature.asc"
Content-Description: Digital signature
Content-Disposition: inline

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.9 (GNU/Linux)

iEYEARECAAYFAkqVt/0ACgkQi/mCfdEo8UrxSwCePMSUra5tk7ieIFD22C66cy2o
msgAoM2n2aszLkKruNvuuAJmUOAYe88X
=BSoL
-----END PGP SIGNATURE-----

--IS0zKkzwUGydFO0o--