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Add proxy class that can implement interfaces at runtime. #5641

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justinfagnani opened this issue Oct 4, 2012 · 7 comments
Closed

Add proxy class that can implement interfaces at runtime. #5641

justinfagnani opened this issue Oct 4, 2012 · 7 comments
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area-language Dart language related items (some items might be better tracked at github.com/dart-lang/language). closed-obsolete Closed as the reported issue is no longer relevant P2 A bug or feature request we're likely to work on type-enhancement A request for a change that isn't a bug

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@justinfagnani
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In unchecked mode it's possible to create objects that implement an interface via noSuchMethod and assign them to a variable or argument of the interface type. This is useful for things like typed proxies for JS interop, automatic stubs for remote/isolated services, etc. In checked mode though assigning to a typed variable causes an exception.

For Proxy, this should work:

var proxy = new Proxy([Foo, Bar]);
assert(proxy is Bar);
assert(proxy is Foo);

Then subclasses can implement behavior.
@gbracha
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gbracha commented Oct 4, 2012

We are aware of this issue and intend to resolve it, as these usage patterns are very important. The specific solution suggested here may or may not be what we end up doing.

Set owner to @gbracha.
Added Accepted label.

@DartBot
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DartBot commented Aug 21, 2013

This comment was originally written by cvl.c...@gmail.com

Is there any progress on this matter?

I use this pattern a lot in my code. For now I do a workaround and introduce a new class for every proxied class but that's cumbersome.

For me to invest more in the dart language, I need to be sure that this is gonna be implemented somehow at some point in the (near) future.

@floitschG
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Issue #6244 has been merged into this issue.

@justinfagnani
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Added C1 label.

@DartBot
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DartBot commented Jan 2, 2015

This comment was originally written by jirkad...@gmail.com

IMO related:

@justinfagnani justinfagnani added Type-Enhancement area-language Dart language related items (some items might be better tracked at github.com/dart-lang/language). labels Jan 2, 2015
@a14n a14n mentioned this issue Jul 22, 2015
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@kevmoo kevmoo removed the accepted label Feb 29, 2016
@pulyaevskiy
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Hey team, just curious, the fact that it's not accepted anymore means this will not be implemented?

I am really interested in solution for this use case.

@kevmoo kevmoo added P2 A bug or feature request we're likely to work on type-enhancement A request for a change that isn't a bug and removed Priority-Medium labels Mar 1, 2016
@floitschG
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@pulyaevskiy:
Sorry for the late response.
As long as the bug is open, it hasn't been rejected. It's not yet high on our TODO lists, and, even when accepted, the outcome might look very different from the proposal here.

TL;DR: we see the need, but we are not currently working on it.

@matanlurey matanlurey added the closed-obsolete Closed as the reported issue is no longer relevant label Jun 19, 2018
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area-language Dart language related items (some items might be better tracked at github.com/dart-lang/language). closed-obsolete Closed as the reported issue is no longer relevant P2 A bug or feature request we're likely to work on type-enhancement A request for a change that isn't a bug
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@kevmoo @matanlurey @pulyaevskiy @justinfagnani @gbracha @floitschG @DartBot