[Mono-list] implicit, explicit, and why does C# have these?

Todd Berman tberman@gentoo.org
Fri, 17 Oct 2003 10:07:18 -0400


Well, implicit casting between Truck and Pear would be up to the API
designer.

If for some reason s/he decides that you can implicitly cast between the
two based on something, no clue what though, it's not the language that
is to blame, but the developer.

C# just provides the developer with the tools to create a OO API that
makes *sense* to the end user with implicit and explicity casting,
nothing more :)

--Todd

-----Original Message-----
From: mono-list-admin@lists.ximian.com
[mailto:mono-list-admin@lists.ximian.com] On Behalf Of David La Motta
Sent: October 17, 2003 9:56 AM
To: Arild Fines
Cc: Jonathan Pryor; Mono-List
Subject: Re: [Mono-list] implicit, explicit, and why does C# have these?

I guess I should expand on my [sort-of] gripe.=A0 Implicit casting by =
the
language itself is OK where it makes sense, like in your example of int
and long.=A0 But, logically, it can be confusing to use an implicit
operator to convert between objects that have nothing in common, and
never will (like Truck and Pear, for instance).

// David


Arild Fines wrote:

David La Motta wrote:
 =20
Thanks for the explanation.  I can see how the implicit operator can
be useful in the example you describe; still, I think it wasn't
necessary for C# to expose them to us.  I.e., let us deal with the
explicit casts and spare the confusion they may cause.  In other
words, an implicit cast from a Pear object to a Truck object can seem
quite odd, assuming their inheritance tree has nothing in common.
   =20

Sure, but would you really want to be required to use an explicit cast
when
converting an int to a long?


--
Arild

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 =20