RE: [sv-bc] Virtual interface resolution

Mark,

I did not see the proposal. Did you attach it to a mantis item?

Francoise
       '

________________________________
From: owner-sv-bc@eda.org [mailto:owner-sv-bc@eda.org] On Behalf Of Gordon Vreugdenhil
Sent: Saturday, January 29, 2011 12:53 AM
To: Mark Hartoog
Cc: sv-bc@eda.org
Subject: Re: [sv-bc] Virtual interface resolution

Mark,

Thanks for the good issue summary and comments.

Along with you, I agree that I tend to prefer the "bind early" and simply say that
the use of an interface name within a virtual type creates an "import like" dependency
on the interface. So the interface must exist and must be *identical* to the one
at compile time in order for it to be legal. As you note, that does impact configurations
and other forms of (arguably) legal but difficult composition issues such as compiling
a virtual interface reference prior to the interface existence.

There are likely still some issues to consider in that space however. For example,
if a virtual interface to a parameterized interface exists, can compile/elaboration
require that some instance of the interface be elaborated "on the side" in order
for the package to compile? If not, there are likely issues related to various bits
of typing and visibility. For parameterized classes for example, the use of the
parameterization as a type implies elaboration of the type even if no object
instances are created. How does that map to interfaces?

I think that those questions need to be looked at very carefully if we want to
go in this direction. It is likely the most tractable direction, but it still is certainly
not trivial.

Gord.

On 1/28/2011 3:06 PM, Mark Hartoog wrote:
I have attached a PDF outlining the problem, possible solutions, and my thoughts on what would be the best alternative.

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Gordon Vreugdenhil                                503-685-0808
Model Technology (Mentor Graphics)                gordonv@model.com<mailto:gordonv@model.com>
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