On Tue, 2007-03-06 at 23:46 +0000, Chris Seaton wrote:
> gmcs says that it
>
> Cannot convert from
> `System.Collections.Generic.List<Katahdin.Grammars.ParseGraphNode>'
> to `System.Collections.Generic.List<Katahdin.Grammars.IParseable>'
>
> ParseGraphNode implements IParseable, so I would have thought that
> the compiler would allow that, but since it doesn't, what is the best
> way to convert from List<InterfaceImplementation> to List<Interface>?
> I know I can instantiate a new List<Interface> and copy one by one
> into that, but it seems a very common operation - is there a shortcut?
I assume you're trying to do this:
void Foo (List<IParseable> list) {...}
List<ParseGraphNode> c = ...;
Foo (c);
The simple solution is to make Foo() itself generic:
void Foo<T> (List<T> list) where T : IParseable {...}
- Jon
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